Enable nullable in the startup templates.

Resolve #14856
3 years ago · 138fc38349
95 changed files with 226 additions and 205 deletions
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/Data/MyProjectNameDbMigrationService.cs
@ -70,13 +70,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/MyCompanyName.MyProjectName.Blazor.Server.Mongo.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/MyCompanyName.MyProjectName.Blazor.Server.Mongo.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/MyProjectNameModule.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server.Mongo/MyProjectNameModule.cs
@ -164,7 +164,7 @@ public class MyProjectNameModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());
        });
    }

--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/Data/MyProjectNameDbMigrationService.cs
@ -79,13 +79,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

@ -184,15 +184,15 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        return Path.Combine(slnDirectoryPath, "MyCompanyName.MyProjectName.Blazor.Server");
    }

-    private string GetSolutionDirectoryPath()
+    private string? GetSolutionDirectoryPath()
    {
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

-        while (Directory.GetParent(currentDirectory.FullName) != null)
+        while (currentDirectory != null && Directory.GetParent(currentDirectory.FullName) != null)
        {
            currentDirectory = Directory.GetParent(currentDirectory.FullName);

-            if (Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
+            if (currentDirectory != null && Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
            {
                return currentDirectory.FullName;
            }
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/MyProjectNameModule.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Blazor.Server/MyProjectNameModule.cs
@ -166,7 +166,7 @@ public class MyProjectNameModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());
        });
    }

--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/Data/MyProjectNameDbMigrationService.cs
@ -70,13 +70,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/Data/OpenIddictDataSeedContributor.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/Data/OpenIddictDataSeedContributor.cs
@ -78,7 +78,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        {
            var webClientRootUrl = configurationSection["MyProjectName_App:RootUrl"]?.TrimEnd('/');
            await CreateApplicationAsync(
-                name: consoleAndAngularClientId,
+                name: consoleAndAngularClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Console Test / Angular Application",
@ -100,10 +100,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var swaggerClientId = configurationSection["MyProjectName_Swagger:ClientId"];
        if (!swaggerClientId.IsNullOrWhiteSpace())
        {
-            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"].TrimEnd('/');
+            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: swaggerClientId,
+                name: swaggerClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Swagger Application",
@ -123,12 +123,12 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        [NotNull] string type,
        [NotNull] string consentType,
        string displayName,
-        string secret,
+        string? secret,
        List<string> grantTypes,
        List<string> scopes,
-        string redirectUri = null,
-        string postLogoutRedirectUri = null,
-        List<string> permissions = null)
+        string? redirectUri = null,
+        string? postLogoutRedirectUri = null,
+        List<string>? permissions = null)
    {
        if (!string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
        {
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/MyCompanyName.MyProjectName.Host.Mongo.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/MyCompanyName.MyProjectName.Host.Mongo.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/MyProjectNameModule.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host.Mongo/MyProjectNameModule.cs
@ -171,7 +171,7 @@ public class MyProjectNameModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());

            options.Applications["Angular"].RootUrl = configuration["App:ClientUrl"];
            options.Applications["Angular"].Urls[AccountUrlNames.PasswordReset] = "account/reset-password";
@ -275,10 +275,10 @@ public class MyProjectNameModule : AbpModule
            {
                builder
                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
+                        configuration["App:CorsOrigins"]?
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
+                            .ToArray() ?? Array.Empty<string>()
                    )
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Data/MyProjectNameDbMigrationService.cs
@ -79,13 +79,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

@ -184,15 +184,15 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        return Path.Combine(slnDirectoryPath, "MyCompanyName.MyProjectName.Host");
    }

-    private string GetSolutionDirectoryPath()
+    private string? GetSolutionDirectoryPath()
    {
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

-        while (Directory.GetParent(currentDirectory.FullName) != null)
+        while (currentDirectory != null && Directory.GetParent(currentDirectory.FullName) != null)
        {
            currentDirectory = Directory.GetParent(currentDirectory.FullName);

-            if (Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
+            if (currentDirectory != null && Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
            {
                return currentDirectory.FullName;
            }
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Data/OpenIddictDataSeedContributor.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/Data/OpenIddictDataSeedContributor.cs
@ -78,7 +78,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        {
            var webClientRootUrl = configurationSection["MyProjectName_App:RootUrl"]?.TrimEnd('/');
            await CreateApplicationAsync(
-                name: consoleAndAngularClientId,
+                name: consoleAndAngularClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Console Test / Angular Application",
@ -100,10 +100,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var swaggerClientId = configurationSection["MyProjectName_Swagger:ClientId"];
        if (!swaggerClientId.IsNullOrWhiteSpace())
        {
-            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"].TrimEnd('/');
+            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: swaggerClientId,
+                name: swaggerClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Swagger Application",
@ -123,12 +123,12 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        [NotNull] string type,
        [NotNull] string consentType,
        string displayName,
-        string secret,
+        string? secret,
        List<string> grantTypes,
        List<string> scopes,
-        string redirectUri = null,
-        string postLogoutRedirectUri = null,
-        List<string> permissions = null)
+        string? redirectUri = null,
+        string? postLogoutRedirectUri = null,
+        List<string>? permissions = null)
    {
        if (!string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
        {
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/MyCompanyName.MyProjectName.Host.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/MyCompanyName.MyProjectName.Host.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/MyProjectNameModule.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Host/MyProjectNameModule.cs
@ -174,7 +174,7 @@ public class MyProjectNameModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());

            options.Applications["Angular"].RootUrl = configuration["App:ClientUrl"];
            options.Applications["Angular"].Urls[AccountUrlNames.PasswordReset] = "account/reset-password";
@ -278,10 +278,10 @@ public class MyProjectNameModule : AbpModule
            {
                builder
                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
+                        configuration["App:CorsOrigins"]?
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
+                            .ToArray() ?? Array.Empty<string>()
                    )
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc.Mongo/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc.Mongo/Data/MyProjectNameDbMigrationService.cs
@ -70,13 +70,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc.Mongo/MyCompanyName.MyProjectName.Mvc.Mongo.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc.Mongo/MyCompanyName.MyProjectName.Mvc.Mongo.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/Data/MyProjectNameDbMigrationService.cs
@ -79,13 +79,13 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
        await _dbSchemaMigrator.MigrateAsync();
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

@ -184,15 +184,15 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        return Path.Combine(slnDirectoryPath, "MyCompanyName.MyProjectName.Mvc");
    }

-    private string GetSolutionDirectoryPath()
+    private string? GetSolutionDirectoryPath()
    {
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

-        while (Directory.GetParent(currentDirectory.FullName) != null)
+        while (currentDirectory != null && Directory.GetParent(currentDirectory.FullName) != null)
        {
            currentDirectory = Directory.GetParent(currentDirectory.FullName);

-            if (Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
+            if (currentDirectory != null && Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
            {
                return currentDirectory.FullName;
            }
--- a/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/MyCompanyName.MyProjectName.Mvc.csproj
+++ b/templates/app-nolayers/aspnet-core/MyCompanyName.MyProjectName.Mvc/MyCompanyName.MyProjectName.Mvc.csproj
@ -2,6 +2,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Application.Contracts/MyCompanyName.MyProjectName.Application.Contracts.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Application.Contracts/MyCompanyName.MyProjectName.Application.Contracts.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Application/MyCompanyName.MyProjectName.Application.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Application/MyCompanyName.MyProjectName.Application.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/MyCompanyName.MyProjectName.AuthServer.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/MyCompanyName.MyProjectName.AuthServer.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/MyProjectNameAuthServerModule.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/MyProjectNameAuthServerModule.cs
@ -114,7 +114,7 @@ public class MyProjectNameAuthServerModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());

            options.Applications["Angular"].RootUrl = configuration["App:ClientUrl"];
            options.Applications["Angular"].Urls[AccountUrlNames.PasswordReset] = "account/reset-password";
@ -150,10 +150,10 @@ public class MyProjectNameAuthServerModule : AbpModule
            {
                builder
                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
+                        configuration["App:CorsOrigins"]?
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
+                            .ToArray() ?? Array.Empty<string>()
                    )
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/Pages/Index.cshtml
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/Pages/Index.cshtml
@ -19,10 +19,8 @@
 <div class="d-flex align-items-center" style="min-height: 100vh;">
    <div class="container">
        <abp-row>
-
            <div class="col mx-auto account-column">
                <div class="account-brand p-4 text-center mb-1">
-
                    @if (!BrandingProvider.LogoUrl.IsNullOrEmpty())
                    {
                        <a class="navbar-brand" href="/" alt="@BrandingProvider.AppName"></a>
@ -33,9 +31,7 @@
                    }
                </div>
                <abp-card>
-
                    <abp-card-body>
-
                        <div class="container">
                            <abp-row>
                                <abp-column size="_9">
@ -68,52 +64,51 @@
                                    <div class="ml-auto p-2 float-end">
                                        <abp-dropdown>
                                            <abp-dropdown-button text="@Model.CurrentLanguage" />
-                                            <abp-dropdown-menu>
-                                                @foreach (var language in Model.Languages)
-                                                {
-                                                    <abp-dropdown-item href="~/Abp/Languages/Switch?culture=@(language.CultureName)&uiCulture=@(language.UiCultureName)&returnUrl=@(System.Net.WebUtility.UrlEncode(Request.GetEncodedPathAndQuery()))">@language.DisplayName</abp-dropdown-item>
-                                                }
-                                            </abp-dropdown-menu>
+                                            @if (@Model.Languages != null)
+                                            {
+                                                <abp-dropdown-menu>
+                                                    @foreach (var language in Model.Languages)
+                                                    {
+                                                        <abp-dropdown-item href="~/Abp/Languages/Switch?culture=@(language.CultureName)&uiCulture=@(language.UiCultureName)&returnUrl=@(System.Net.WebUtility.UrlEncode(Request.GetEncodedPathAndQuery()))">@language.DisplayName</abp-dropdown-item>
+                                                    }
+                                                </abp-dropdown-menu>
+                                            }
                                        </abp-dropdown>
                                    </div>
                                </abp-column>
-
                            </abp-row>
                            <hr class="m-4" />
-
                            <abp-row>
-
-                                @foreach (var application in Model.Applications)
+                                @if (Model.Applications != null)
                                {
-                                    <abp-column size-md="_4" class="mb-2">
-                                        <abp-card>
-                                            <abp-card-body>
-
-                                                @if (!application.LogoUri.IsNullOrEmpty())
-                                                {
-                                                    <div class="mx-auto">
-                                                        <img src="@application.LogoUri" style="height:64px" class="mb-3" />
+                                    foreach (var application in Model.Applications)
+                                    {
+                                        <abp-column size-md="@Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Grid.ColumnSize._4" class="mb-2">
+                                            <abp-card>
+                                                <abp-card-body>
+
+                                                    @if (!application.LogoUri.IsNullOrEmpty())
+                                                    {
+                                                        <div class="mx-auto">
+                                                            <img src="@application.LogoUri" style="height:64px" class="mb-3"/>
+                                                        </div>
+                                                    }
+
+                                                    <h4>@application.DisplayName</h4>
+                                                    <span class="text-muted">@application.ClientUri</span>
+                                                    <div class="mt-1">
+                                                        <a abp-button="@Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Button.AbpButtonType.Outline_Secondary" href="@application.ClientUri">@L["Visit"]</a>
                                                    </div>
-                                                }
-
-                                                <h4>@application.DisplayName</h4>
-                                                <span class="text-muted">@application.ClientUri</span>
-                                                <div class="mt-1">
-                                                    <a abp-button="Outline_Secondary" href="@application.ClientUri">@L["Visit"]</a>
-                                                </div>
-                                            </abp-card-body>
-                                        </abp-card>
-                                    </abp-column>
+                                                </abp-card-body>
+                                            </abp-card>
+                                        </abp-column>
+                                    }
                                }
-
                            </abp-row>
                        </div>
-
                    </abp-card-body>
-
                </abp-card>
            </div>
-
        </abp-row>
    </div>
-</div>
+</div>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/Pages/Index.cshtml.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.AuthServer/Pages/Index.cshtml.cs
@ -9,11 +9,11 @@ namespace MyCompanyName.MyProjectName.Pages;

 public class IndexModel : AbpPageModel
 {
-    public List<OpenIddictApplication> Applications { get; protected set; }
+    public List<OpenIddictApplication>? Applications { get; protected set; }

-    public IReadOnlyList<LanguageInfo> Languages { get; protected set; }
+    public IReadOnlyList<LanguageInfo>? Languages { get; protected set; }

-    public string CurrentLanguage { get; protected set; }
+    public string? CurrentLanguage { get; protected set; }

    protected IOpenIddictApplicationRepository OpenIdApplicationRepository { get; }

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server.Tiered/MyCompanyName.MyProjectName.Blazor.Server.Tiered.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server.Tiered/MyCompanyName.MyProjectName.Blazor.Server.Tiered.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyProjectNameBlazorModule.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyProjectNameBlazorModule.cs
@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using Blazorise.Bootstrap5;
 using Blazorise.Icons.FontAwesome;
@ -111,7 +112,7 @@ public class MyProjectNameBlazorModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());
        });
    }

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/MyCompanyName.MyProjectName.Blazor.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/MyCompanyName.MyProjectName.Blazor.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <BlazorWebAssemblyLoadAllGlobalizationData>true</BlazorWebAssemblyLoadAllGlobalizationData>
    <!-- <TEMPLATE-REMOVE IF-NOT='PWA'> -->
    <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.DbMigrator/MyCompanyName.MyProjectName.DbMigrator.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.DbMigrator/MyCompanyName.MyProjectName.DbMigrator.csproj
@ -5,6 +5,7 @@
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain.Shared/MyCompanyName.MyProjectName.Domain.Shared.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain.Shared/MyCompanyName.MyProjectName.Domain.Shared.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/Data/MyProjectNameDbMigrationService.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/Data/MyProjectNameDbMigrationService.cs
@ -87,7 +87,7 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        Logger.LogInformation("You can safely end this process...");
    }

-    private async Task MigrateDatabaseSchemaAsync(Tenant tenant = null)
+    private async Task MigrateDatabaseSchemaAsync(Tenant? tenant = null)
    {
        Logger.LogInformation(
            $"Migrating schema for {(tenant == null ? "host" : tenant.Name + " tenant")} database...");
@ -98,7 +98,7 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        }
    }

-    private async Task SeedDataAsync(Tenant tenant = null)
+    private async Task SeedDataAsync(Tenant? tenant = null)
    {
        Logger.LogInformation($"Executing {(tenant == null ? "host" : tenant.Name + " tenant")} database seed...");

@ -152,8 +152,7 @@ public class MyProjectNameDbMigrationService : ITransientDependency
    private bool MigrationsFolderExists()
    {
        var dbMigrationsProjectFolder = GetEntityFrameworkCoreProjectFolderPath();
-
-        return Directory.Exists(Path.Combine(dbMigrationsProjectFolder, "Migrations"));
+        return dbMigrationsProjectFolder != null && Directory.Exists(Path.Combine(dbMigrationsProjectFolder, "Migrations"));
    }

    private void AddInitialMigration()
@ -188,7 +187,7 @@ public class MyProjectNameDbMigrationService : ITransientDependency
        }
    }

-    private string GetEntityFrameworkCoreProjectFolderPath()
+    private string? GetEntityFrameworkCoreProjectFolderPath()
    {
        var slnDirectoryPath = GetSolutionDirectoryPath();

@ -203,15 +202,15 @@ public class MyProjectNameDbMigrationService : ITransientDependency
            .FirstOrDefault(d => d.EndsWith(".EntityFrameworkCore"));
    }

-    private string GetSolutionDirectoryPath()
+    private string? GetSolutionDirectoryPath()
    {
        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());

-        while (Directory.GetParent(currentDirectory.FullName) != null)
+        while (currentDirectory != null && Directory.GetParent(currentDirectory.FullName) != null)
        {
            currentDirectory = Directory.GetParent(currentDirectory.FullName);

-            if (Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
+            if (currentDirectory != null && Directory.GetFiles(currentDirectory.FullName).FirstOrDefault(f => f.EndsWith(".sln")) != null)
            {
                return currentDirectory.FullName;
            }
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyCompanyName.MyProjectName.Domain.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyCompanyName.MyProjectName.Domain.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/OpenIddict/OpenIddictDataSeedContributor.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/OpenIddict/OpenIddictDataSeedContributor.cs
@ -87,7 +87,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
            /* MyProjectName_Web client is only needed if you created a tiered
             * solution. Otherwise, you can delete this client. */
            await CreateApplicationAsync(
-                name: webClientId,
+                name: webClientId!,
                type: OpenIddictConstants.ClientTypes.Confidential,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Web Application",
@ -110,7 +110,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        {
            var consoleAndAngularClientRootUrl = configurationSection["MyProjectName_App:RootUrl"]?.TrimEnd('/');
            await CreateApplicationAsync(
-                name: consoleAndAngularClientId,
+                name: consoleAndAngularClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Console Test / Angular Application",
@ -133,10 +133,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var blazorClientId = configurationSection["MyProjectName_Blazor:ClientId"];
        if (!blazorClientId.IsNullOrWhiteSpace())
        {
-            var blazorRootUrl = configurationSection["MyProjectName_Blazor:RootUrl"].TrimEnd('/');
+            var blazorRootUrl = configurationSection["MyProjectName_Blazor:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: blazorClientId,
+                name: blazorClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Blazor Application",
@ -159,7 +159,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
            var blazorServerTieredRootUrl = configurationSection["MyProjectName_BlazorServerTiered:RootUrl"].EnsureEndsWith('/');

            await CreateApplicationAsync(
-                name: blazorServerTieredClientId,
+                name: blazorServerTieredClientId!,
                type: OpenIddictConstants.ClientTypes.Confidential,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Blazor Server Application",
@ -180,10 +180,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var swaggerClientId = configurationSection["MyProjectName_Swagger:ClientId"];
        if (!swaggerClientId.IsNullOrWhiteSpace())
        {
-            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"].TrimEnd('/');
+            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: swaggerClientId,
+                name: swaggerClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Swagger Application",
@ -204,13 +204,13 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        [NotNull] string type,
        [NotNull] string consentType,
        string displayName,
-        string secret,
+        string? secret,
        List<string> grantTypes,
        List<string> scopes,
-        string clientUri = null,
-        string redirectUri = null,
-        string postLogoutRedirectUri = null,
-        List<string> permissions = null)
+        string? clientUri = null,
+        string? redirectUri = null,
+        string? postLogoutRedirectUri = null,
+        List<string>? permissions = null)
    {
        if (!string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
        {
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/MyCompanyName.MyProjectName.EntityFrameworkCore.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/MyCompanyName.MyProjectName.EntityFrameworkCore.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Client/MyCompanyName.MyProjectName.HttpApi.Client.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Client/MyCompanyName.MyProjectName.HttpApi.Client.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Host/MyCompanyName.MyProjectName.HttpApi.Host.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Host/MyCompanyName.MyProjectName.HttpApi.Host.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-4681b4fd-151f-4221-84a4-929d86723e4c</UserSecretsId>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Host/MyProjectNameHttpApiHostModule.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Host/MyProjectNameHttpApiHostModule.cs
@ -155,12 +155,10 @@ public class MyProjectNameHttpApiHostModule : AbpModule
            options.AddDefaultPolicy(builder =>
            {
                builder
-                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
-                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
-                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
-                    )
+                    .WithOrigins(configuration["App:CorsOrigins"]?
+                        .Split(",", StringSplitOptions.RemoveEmptyEntries)
+                        .Select(o => o.RemovePostFix("/"))
+                        .ToArray() ?? Array.Empty<string>())
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
                    .AllowAnyHeader()
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.HostWithIds/MyCompanyName.MyProjectName.HttpApi.HostWithIds.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.HostWithIds/MyCompanyName.MyProjectName.HttpApi.HostWithIds.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-4681b4fd-151f-4221-84a4-929d86723e4c</UserSecretsId>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.HostWithIds/MyProjectNameHttpApiHostModule.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.HostWithIds/MyProjectNameHttpApiHostModule.cs
@ -95,7 +95,7 @@ public class MyProjectNameHttpApiHostModule : AbpModule
        Configure<AppUrlOptions>(options =>
        {
            options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+            options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());

            options.Applications["Angular"].RootUrl = configuration["App:ClientUrl"];
            options.Applications["Angular"].Urls[AccountUrlNames.PasswordReset] = "account/reset-password";
@ -155,14 +155,12 @@ public class MyProjectNameHttpApiHostModule : AbpModule
        context.Services.AddCors(options =>
        {
            options.AddDefaultPolicy(builder =>
-               {
+            {
                builder
-                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
-                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
-                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
-                    )
+                    .WithOrigins(configuration["App:CorsOrigins"]?
+                        .Split(",", StringSplitOptions.RemoveEmptyEntries)
+                        .Select(o => o.RemovePostFix("/"))
+                        .ToArray() ?? Array.Empty<string>())
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
                    .AllowAnyHeader()
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi/MyCompanyName.MyProjectName.HttpApi.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi/MyCompanyName.MyProjectName.HttpApi.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.MongoDB/MyCompanyName.MyProjectName.MongoDB.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.MongoDB/MyCompanyName.MyProjectName.MongoDB.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web.Host/MyCompanyName.MyProjectName.Web.Host.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web.Host/MyCompanyName.MyProjectName.Web.Host.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName.Web</RootNamespace>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web/Menus/MyProjectNameMenuContributor.cs
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web/Menus/MyProjectNameMenuContributor.cs
@ -18,7 +18,7 @@ public class MyProjectNameMenuContributor : IMenuContributor
        }
    }

-    private async Task ConfigureMainMenuAsync(MenuConfigurationContext context)
+    private Task ConfigureMainMenuAsync(MenuConfigurationContext context)
    {
        var administration = context.Menu.GetAdministration();
        var l = context.GetLocalizer<MyProjectNameResource>();
@ -45,5 +45,7 @@ public class MyProjectNameMenuContributor : IMenuContributor

        administration.SetSubItemOrder(IdentityMenuNames.GroupName, 2);
        administration.SetSubItemOrder(SettingManagementMenuNames.GroupName, 3);
+
+        return Task.CompletedTask;
    }
 }
--- a/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web/MyCompanyName.MyProjectName.Web.csproj
+++ b/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web/MyCompanyName.MyProjectName.Web.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName.Web</RootNamespace>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Application.Tests/MyCompanyName.MyProjectName.Application.Tests.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Application.Tests/MyCompanyName.MyProjectName.Application.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/MyCompanyName.MyProjectName.Domain.Tests.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/MyCompanyName.MyProjectName.Domain.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreTestModule.cs
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/EntityFrameworkCore/MyProjectNameEntityFrameworkCoreTestModule.cs
@ -17,7 +17,7 @@ namespace MyCompanyName.MyProjectName.EntityFrameworkCore;
    )]
 public class MyProjectNameEntityFrameworkCoreTestModule : AbpModule
 {
-    private SqliteConnection _sqliteConnection;
+    private SqliteConnection? _sqliteConnection;

    public override void ConfigureServices(ServiceConfigurationContext context)
    {
@ -39,7 +39,7 @@ public class MyProjectNameEntityFrameworkCoreTestModule : AbpModule

    public override void OnApplicationShutdown(ApplicationShutdownContext context)
    {
-        _sqliteConnection.Dispose();
+        _sqliteConnection?.Dispose();
    }

    private static SqliteConnection CreateDatabaseAndGetConnection()
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp.csproj
@ -3,6 +3,7 @@
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.MongoDB.Tests/MyCompanyName.MyProjectName.MongoDB.Tests.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.MongoDB.Tests/MyCompanyName.MyProjectName.MongoDB.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/MyCompanyName.MyProjectName.TestBase.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/MyCompanyName.MyProjectName.TestBase.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Security/FakeCurrentPrincipalAccessor.cs
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Security/FakeCurrentPrincipalAccessor.cs
@ -13,30 +13,13 @@ public class FakeCurrentPrincipalAccessor : ThreadCurrentPrincipalAccessor
        return GetPrincipal();
    }

-    private ClaimsPrincipal _principal;
-
    private ClaimsPrincipal GetPrincipal()
    {
-        if (_principal == null)
+        return new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
        {
-            lock (this)
-            {
-                if (_principal == null)
-                {
-                    _principal = new ClaimsPrincipal(
-                        new ClaimsIdentity(
-                            new List<Claim>
-                            {
-                                    new Claim(AbpClaimTypes.UserId,"2e701e62-0953-4dd3-910b-dc6cc93ccb0d"),
-                                    new Claim(AbpClaimTypes.UserName,"admin"),
-                                    new Claim(AbpClaimTypes.Email,"admin@abp.io")
-                            }
-                        )
-                    );
-                }
-            }
-        }
-
-        return _principal;
+            new Claim(AbpClaimTypes.UserId, "2e701e62-0953-4dd3-910b-dc6cc93ccb0d"),
+            new Claim(AbpClaimTypes.UserName, "admin"),
+            new Claim(AbpClaimTypes.Email, "admin@abp.io")
+        }));
    }
 }
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/MyCompanyName.MyProjectName.Web.Tests.csproj
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/MyCompanyName.MyProjectName.Web.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <OutputType>Exe</OutputType>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/MyProjectNameWebTestBase.cs
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/MyProjectNameWebTestBase.cs
@ -1,4 +1,5 @@
-using System.Net;
+using System;
+using System.Net;
 using System.Net.Http;
 using System.Text.Json;
 using System.Threading.Tasks;
@ -14,10 +15,10 @@ public abstract class MyProjectNameWebTestBase : AbpAspNetCoreIntegratedTestBase
    {
        return base
            .CreateHostBuilder()
-            .UseContentRoot(WebContentDirectoryFinder.CalculateContentRootFolder());
+            .UseContentRoot(WebContentDirectoryFinder.CalculateContentRootFolder() ?? throw new InvalidOperationException());
    }

-    protected virtual async Task<T> GetResponseAsObjectAsync<T>(string url, HttpStatusCode expectedStatusCode = HttpStatusCode.OK)
+    protected virtual async Task<T?> GetResponseAsObjectAsync<T>(string url, HttpStatusCode expectedStatusCode = HttpStatusCode.OK)
    {
        var strResponse = await GetResponseAsStringAsync(url, expectedStatusCode);
        return JsonSerializer.Deserialize<T>(strResponse, new JsonSerializerOptions(JsonSerializerDefaults.Web));
--- a/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/WebContentDirectoryFinder.cs
+++ b/templates/app/aspnet-core/test/MyCompanyName.MyProjectName.Web.Tests/WebContentDirectoryFinder.cs
@ -11,7 +11,7 @@ namespace MyCompanyName.MyProjectName;
 /// </summary>
 public static class WebContentDirectoryFinder
 {
-    public static string CalculateContentRootFolder()
+    public static string? CalculateContentRootFolder()
    {
        var domainAssemblyDirectoryPath =
            Path.GetDirectoryName(typeof(MyProjectNameDomainModule).Assembly.Location);
--- a/templates/console/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
+++ b/templates/console/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
@ -5,6 +5,7 @@
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
    </PropertyGroup>

    <ItemGroup>
--- a/templates/maui/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
+++ b/templates/maui/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
@ -1,12 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">

 	<Import Project="..\..\common.props" />
-	
+
 	<PropertyGroup>
 		<TargetFrameworks>net7.0-android;net7.0-ios;net7.0-maccatalyst</TargetFrameworks>
 		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net7.0-windows10.0.19041.0</TargetFrameworks>
 		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
 		<!-- <TargetFrameworks>$(TargetFrameworks);net7.0-tizen</TargetFrameworks> -->
+		<Nullable>enable</Nullable>
 		<OutputType>Exe</OutputType>
 		<RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
 		<UseMaui>true</UseMaui>
@ -54,7 +55,7 @@
 		<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
 		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
 	</ItemGroup>
-	
+
 	<ItemGroup>
 	  <None Remove="appsettings.json" />
 	  <EmbeddedResource Include="appsettings.json" />
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/MyCompanyName.MyProjectName.AuthServer.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/MyCompanyName.MyProjectName.AuthServer.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-c2d31439-b723-48e2-b061-5ebd7aeb6010</UserSecretsId>
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/MyProjectNameAuthServerModule.cs
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/MyProjectNameAuthServerModule.cs
@ -175,10 +175,10 @@ public class MyProjectNameAuthServerModule : AbpModule
            {
                builder
                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
+                        configuration["App:CorsOrigins"]?
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
+                            .ToArray() ?? Array.Empty<string>()
                    )
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/OpenIddict/OpenIddictDataSeedContributor.cs
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.AuthServer/OpenIddict/OpenIddictDataSeedContributor.cs
@ -86,7 +86,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
            /* MyProjectName_Web client is only needed if you created a tiered
             * solution. Otherwise, you can delete this client. */
            await CreateApplicationAsync(
-                name: webClientId,
+                name: webClientId!,
                type: OpenIddictConstants.ClientTypes.Confidential,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Web Application",
@ -108,7 +108,7 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        {
            var consoleAndAngularClientRootUrl = configurationSection["MyProjectName_App:RootUrl"]?.TrimEnd('/');
            await CreateApplicationAsync(
-                name: consoleAndAngularClientId,
+                name: consoleAndAngularClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Console Test / Angular Application",
@ -130,10 +130,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var blazorClientId = configurationSection["MyProjectName_Blazor:ClientId"];
        if (!blazorClientId.IsNullOrWhiteSpace())
        {
-            var blazorRootUrl = configurationSection["MyProjectName_Blazor:RootUrl"].TrimEnd('/');
+            var blazorRootUrl = configurationSection["MyProjectName_Blazor:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: blazorClientId,
+                name: blazorClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Blazor Application",
@ -152,10 +152,10 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        var swaggerClientId = configurationSection["MyProjectName_Swagger:ClientId"];
        if (!swaggerClientId.IsNullOrWhiteSpace())
        {
-            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"].TrimEnd('/');
+            var swaggerRootUrl = configurationSection["MyProjectName_Swagger:RootUrl"]?.TrimEnd('/');

            await CreateApplicationAsync(
-                name: swaggerClientId,
+                name: swaggerClientId!,
                type: OpenIddictConstants.ClientTypes.Public,
                consentType: OpenIddictConstants.ConsentTypes.Implicit,
                displayName: "Swagger Application",
@ -175,12 +175,12 @@ public class OpenIddictDataSeedContributor : IDataSeedContributor, ITransientDep
        [NotNull] string type,
        [NotNull] string consentType,
        string displayName,
-        string secret,
+        string? secret,
        List<string> grantTypes,
        List<string> scopes,
-        string redirectUri = null,
-        string postLogoutRedirectUri = null,
-        List<string> permissions = null)
+        string? redirectUri = null,
+        string? postLogoutRedirectUri = null,
+        List<string>? permissions = null)
    {
        if (!string.IsNullOrEmpty(secret) && string.Equals(type, OpenIddictConstants.ClientTypes.Public, StringComparison.OrdinalIgnoreCase))
        {
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Host/MyCompanyName.MyProjectName.Blazor.Host.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Host/MyCompanyName.MyProjectName.Blazor.Host.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <BlazorWebAssemblyLoadAllGlobalizationData>true</BlazorWebAssemblyLoadAllGlobalizationData>
  </PropertyGroup>

--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Host/Pages/Index.razor
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Host/Pages/Index.razor
@ -47,12 +47,12 @@

@code
 {
-    private IEnumerable<Claim> _claims;
+    private IEnumerable<Claim>? _claims;

-    protected async override Task OnInitializedAsync()
+    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
-        if (authState.User.Identity.IsAuthenticated)
+        if (authState.User.Identity != null && authState.User.Identity.IsAuthenticated)
        {
            _claims = authState.User.Claims;
        }
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/MyCompanyName.MyProjectName.Blazor.Server.Host.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/MyCompanyName.MyProjectName.Blazor.Server.Host.csproj
@ -4,6 +4,7 @@

    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
        <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
        <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
        <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/MyProjectNameBlazorHostModule.cs
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/MyProjectNameBlazorHostModule.cs
@ -209,7 +209,7 @@ public class MyProjectNameBlazorHostModule : AbpModule
            Configure<AppUrlOptions>(options =>
            {
                options.Applications["MVC"].RootUrl = configuration["App:SelfUrl"];
-                options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"].Split(','));
+                options.RedirectAllowedUrls.AddRange(configuration["App:RedirectAllowedUrls"]?.Split(',') ?? Array.Empty<string>());
            });

 #if DEBUG
@ -217,7 +217,7 @@ public class MyProjectNameBlazorHostModule : AbpModule
 #endif
    }

-    public async override Task OnApplicationInitializationAsync(ApplicationInitializationContext context)
+    public override async Task OnApplicationInitializationAsync(ApplicationInitializationContext context)
    {
        var env = context.GetEnvironment();
        var app = context.GetApplicationBuilder();
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/Pages/Index.razor
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Blazor.Server.Host/Pages/Index.razor
@ -1,8 +1,5 @@
@page "/"
-@using Volo.Abp.MultiTenancy
@inherits MyProjectNameComponentBase
-@inject ICurrentTenant CurrentTenant
-@inject AuthenticationStateProvider AuthenticationStateProvider
 <div class="container">
    <div class="p-5 text-center">

--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Host.Shared/MyCompanyName.MyProjectName.Host.Shared.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Host.Shared/MyCompanyName.MyProjectName.Host.Shared.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.HttpApi.Host/MyCompanyName.MyProjectName.HttpApi.Host.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.HttpApi.Host/MyCompanyName.MyProjectName.HttpApi.Host.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-c2d31439-b723-48e2-b061-5ebd7aeb6010</UserSecretsId>
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.HttpApi.Host/MyProjectNameHttpApiHostModule.cs
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.HttpApi.Host/MyProjectNameHttpApiHostModule.cs
@ -143,10 +143,10 @@ public class MyProjectNameHttpApiHostModule : AbpModule
            {
                builder
                    .WithOrigins(
-                        configuration["App:CorsOrigins"]
+                        configuration["App:CorsOrigins"]?
                            .Split(",", StringSplitOptions.RemoveEmptyEntries)
                            .Select(o => o.RemovePostFix("/"))
-                            .ToArray()
+                            .ToArray() ?? Array.Empty<string>()
                    )
                    .WithAbpExposedHeaders()
                    .SetIsOriginAllowedToAllowWildcardSubdomains()
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Web.Host/MyCompanyName.MyProjectName.Web.Host.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Web.Host/MyCompanyName.MyProjectName.Web.Host.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-c2d31439-b723-48e2-b061-5ebd7aeb6010</UserSecretsId>
--- a/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Web.Unified/MyCompanyName.MyProjectName.Web.Unified.csproj
+++ b/templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Web.Unified/MyCompanyName.MyProjectName.Web.Unified.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <PreserveCompilationReferences>true</PreserveCompilationReferences>
    <UserSecretsId>MyCompanyName.MyProjectName-c2d31439-b723-48e2-b061-5ebd7aeb6010</UserSecretsId>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Application.Contracts/MyCompanyName.MyProjectName.Application.Contracts.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Application.Contracts/MyCompanyName.MyProjectName.Application.Contracts.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Application/MyCompanyName.MyProjectName.Application.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Application/MyCompanyName.MyProjectName.Application.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.Server/MyCompanyName.MyProjectName.Blazor.Server.csproj
@ -4,6 +4,7 @@

    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
    </PropertyGroup>

    <ItemGroup>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.WebAssembly/MyCompanyName.MyProjectName.Blazor.WebAssembly.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor.WebAssembly/MyCompanyName.MyProjectName.Blazor.WebAssembly.csproj
@ -4,8 +4,9 @@

    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
    </PropertyGroup>
-    
+
    <ItemGroup>
        <ProjectReference Include="..\..\..\..\..\framework\src\Volo.Abp.AspNetCore.Components.WebAssembly.Theming\Volo.Abp.AspNetCore.Components.WebAssembly.Theming.csproj"/>
    </ItemGroup>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/MyCompanyName.MyProjectName.Blazor.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Blazor/MyCompanyName.MyProjectName.Blazor.csproj
@ -4,6 +4,7 @@

    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
    </PropertyGroup>

    <ItemGroup>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain.Shared/MyCompanyName.MyProjectName.Domain.Shared.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain.Shared/MyCompanyName.MyProjectName.Domain.Shared.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
  </PropertyGroup>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyCompanyName.MyProjectName.Domain.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyCompanyName.MyProjectName.Domain.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyProjectNameDbProperties.cs
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Domain/MyProjectNameDbProperties.cs
@ -4,7 +4,7 @@ public static class MyProjectNameDbProperties
 {
    public static string DbTablePrefix { get; set; } = "MyProjectName";

-    public static string DbSchema { get; set; } = null;
+    public static string? DbSchema { get; set; } = null;

    public const string ConnectionStringName = "MyProjectName";
 }
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/MyCompanyName.MyProjectName.EntityFrameworkCore.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.EntityFrameworkCore/MyCompanyName.MyProjectName.EntityFrameworkCore.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Client/MyCompanyName.MyProjectName.HttpApi.Client.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Client/MyCompanyName.MyProjectName.HttpApi.Client.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi/MyCompanyName.MyProjectName.HttpApi.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi/MyCompanyName.MyProjectName.HttpApi.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Installer/MyCompanyName.MyProjectName.Installer.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Installer/MyCompanyName.MyProjectName.Installer.csproj
@ -4,6 +4,7 @@

    <PropertyGroup>
        <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
        <GenerateEmbeddedFilesManifest>true</GenerateEmbeddedFilesManifest>
        <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
    </PropertyGroup>
--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.MongoDB/MyCompanyName.MyProjectName.MongoDB.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.MongoDB/MyCompanyName.MyProjectName.MongoDB.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Web/MyCompanyName.MyProjectName.Web.csproj
+++ b/templates/module/aspnet-core/src/MyCompanyName.MyProjectName.Web/MyCompanyName.MyProjectName.Web.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
    <IsPackable>true</IsPackable>
    <OutputType>Library</OutputType>
--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Application.Tests/MyCompanyName.MyProjectName.Application.Tests.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Application.Tests/MyCompanyName.MyProjectName.Application.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/MyCompanyName.MyProjectName.Domain.Tests.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/MyCompanyName.MyProjectName.Domain.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/Samples/SampleManager_Tests.cs
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.Domain.Tests/Samples/SampleManager_Tests.cs
@ -13,8 +13,8 @@ public class SampleManager_Tests : MyProjectNameDomainTestBase
    }

    [Fact]
-    public async Task Method1Async()
+    public Task Method1Async()
    {
-
+        return Task.CompletedTask;
    }
 }
--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests/MyCompanyName.MyProjectName.EntityFrameworkCore.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp/MyCompanyName.MyProjectName.HttpApi.Client.ConsoleTestApp.csproj
@ -3,6 +3,7 @@
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.MongoDB.Tests/MyCompanyName.MyProjectName.MongoDB.Tests.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.MongoDB.Tests/MyCompanyName.MyProjectName.MongoDB.Tests.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/MyCompanyName.MyProjectName.TestBase.csproj
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/MyCompanyName.MyProjectName.TestBase.csproj
@ -4,6 +4,7 @@

  <PropertyGroup>
    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
    <RootNamespace>MyCompanyName.MyProjectName</RootNamespace>
  </PropertyGroup>

--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Samples/SampleRepository_Tests.cs
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Samples/SampleRepository_Tests.cs
@ -19,8 +19,8 @@ public abstract class SampleRepository_Tests<TStartupModule> : MyProjectNameTest
    }

    [Fact]
-    public async Task Method1Async()
+    public Task Method1Async()
    {
-
+        return Task.CompletedTask;
    }
 }
--- a/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Security/FakeCurrentPrincipalAccessor.cs
+++ b/templates/module/aspnet-core/test/MyCompanyName.MyProjectName.TestBase/Security/FakeCurrentPrincipalAccessor.cs
@ -13,30 +13,15 @@ public class FakeCurrentPrincipalAccessor : ThreadCurrentPrincipalAccessor
        return GetPrincipal();
    }

-    private ClaimsPrincipal _principal;
-
    private ClaimsPrincipal GetPrincipal()
    {
-        if (_principal == null)
-        {
-            lock (this)
-            {
-                if (_principal == null)
+        return new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>
                {
-                    _principal = new ClaimsPrincipal(
-                        new ClaimsIdentity(
-                            new List<Claim>
-                            {
-                                    new Claim(AbpClaimTypes.UserId,"2e701e62-0953-4dd3-910b-dc6cc93ccb0d"),
-                                    new Claim(AbpClaimTypes.UserName,"admin"),
-                                    new Claim(AbpClaimTypes.Email,"admin@abp.io")
-                            }
-                        )
-                    );
+                    new Claim(AbpClaimTypes.UserId, "2e701e62-0953-4dd3-910b-dc6cc93ccb0d"),
+                    new Claim(AbpClaimTypes.UserName, "admin"),
+                    new Claim(AbpClaimTypes.Email, "admin@abp.io")
                }
-            }
-        }
-
-        return _principal;
+            )
+        );
    }
 }
--- a/templates/wpf/src/MyCompanyName.MyProjectName/App.xaml.cs
+++ b/templates/wpf/src/MyCompanyName.MyProjectName/App.xaml.cs
@ -12,9 +12,9 @@ namespace MyCompanyName.MyProjectName;
 /// </summary>
 public partial class App : Application
 {
-    private IAbpApplicationWithInternalServiceProvider _abpApplication;
+    private IAbpApplicationWithInternalServiceProvider? _abpApplication;

-    protected async override void OnStartup(StartupEventArgs e)
+    protected override async void OnStartup(StartupEventArgs e)
    {
        Log.Logger = new LoggerConfiguration()
 #if DEBUG
@ -48,9 +48,12 @@ public partial class App : Application
        }
    }

-    protected async override void OnExit(ExitEventArgs e)
+    protected override async void OnExit(ExitEventArgs e)
    {
-        await _abpApplication.ShutdownAsync();
+        if (_abpApplication != null)
+        {
+            await _abpApplication.ShutdownAsync();
+        }
        Log.CloseAndFlush();
    }
 }
--- a/templates/wpf/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
+++ b/templates/wpf/src/MyCompanyName.MyProjectName/MyCompanyName.MyProjectName.csproj
@ -5,6 +5,7 @@
    <PropertyGroup>
        <OutputType>WinExe</OutputType>
        <TargetFramework>net7.0-windows</TargetFramework>
+        <Nullable>enable</Nullable>
        <UseWPF>true</UseWPF>
    </PropertyGroup>