diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo.Abp.TextTemplating.Razor.csproj b/framework/src/Volo.Abp.TextTemplating.Razor/Volo.Abp.TextTemplating.Razor.csproj
index 962746bd0a..4242ca9f29 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo.Abp.TextTemplating.Razor.csproj
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo.Abp.TextTemplating.Razor.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/AbpRazorTemplateCSharpCompiler.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/AbpRazorTemplateCSharpCompiler.cs
index c1dc5005b1..bdc8897ddf 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/AbpRazorTemplateCSharpCompiler.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/AbpRazorTemplateCSharpCompiler.cs
@@ -40,7 +40,7 @@ public class AbpRazorTemplateCSharpCompiler : ISingletonDependency
         .Select(x => MetadataReference.CreateFromFile(x.Location))
         .ToImmutableList();
 
-    public virtual Stream CreateAssembly(string code, string assemblyName, List<MetadataReference> references = null, CSharpCompilationOptions options = null)
+    public virtual Stream CreateAssembly(string code, string assemblyName, List<MetadataReference>? references = null, CSharpCompilationOptions? options = null)
     {
         var defaultReferences = DefaultReferences.Concat(Options.References);
         try
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/DefaultAbpRazorProjectEngineFactory.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/DefaultAbpRazorProjectEngineFactory.cs
index d15d70ded6..d17bfaea4f 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/DefaultAbpRazorProjectEngineFactory.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/DefaultAbpRazorProjectEngineFactory.cs
@@ -7,7 +7,7 @@ namespace Volo.Abp.TextTemplating.Razor;
 
 public class DefaultAbpRazorProjectEngineFactory : IAbpRazorProjectEngineFactory, ITransientDependency
 {
-    public virtual async Task<RazorProjectEngine> CreateAsync(Action<RazorProjectEngineBuilder> configure = null)
+    public virtual async Task<RazorProjectEngine> CreateAsync(Action<RazorProjectEngineBuilder>? configure = null)
     {
         return RazorProjectEngine.Create(await CreateRazorConfigurationAsync(), EmptyProjectFileSystem.Empty, configure);
     }
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/EmptyProjectFileSystem.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/EmptyProjectFileSystem.cs
index fd2b90a6b1..8c8d8703dd 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/EmptyProjectFileSystem.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/EmptyProjectFileSystem.cs
@@ -21,7 +21,7 @@ internal class EmptyProjectFileSystem : RazorProjectFileSystem
         return GetItem(path, fileKind: null);
     }
 
-    public override RazorProjectItem GetItem(string path, string fileKind)
+    public override RazorProjectItem GetItem(string path, string? fileKind)
     {
         NormalizeAndEnsureValidPath(path);
         return new NotFoundProjectItem(string.Empty, path, fileKind);
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IAbpRazorProjectEngineFactory.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IAbpRazorProjectEngineFactory.cs
index 969ce762d1..197133ef72 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IAbpRazorProjectEngineFactory.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IAbpRazorProjectEngineFactory.cs
@@ -6,5 +6,5 @@ namespace Volo.Abp.TextTemplating.Razor;
 
 public interface IAbpRazorProjectEngineFactory
 {
-    Task<RazorProjectEngine> CreateAsync(Action<RazorProjectEngineBuilder> configure = null);
+    Task<RazorProjectEngine> CreateAsync(Action<RazorProjectEngineBuilder>? configure = null);
 }
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IRazorTemplatePage.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IRazorTemplatePage.cs
index 78b80941e9..f4b2a17006 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IRazorTemplatePage.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/IRazorTemplatePage.cs
@@ -8,24 +8,24 @@ namespace Volo.Abp.TextTemplating.Razor;
 
 public interface IRazorTemplatePage<TModel> : IRazorTemplatePage
 {
-    TModel Model { get; set; }
+    TModel? Model { get; set; }
 }
 
 public interface IRazorTemplatePage
 {
     IServiceProvider ServiceProvider { get; set; }
 
-    IStringLocalizer Localizer { get; set; }
+    IStringLocalizer? Localizer { get; set; }
 
-    HtmlEncoder HtmlEncoder { get; set; }
+    HtmlEncoder? HtmlEncoder { get; set; }
 
-    JavaScriptEncoder JavaScriptEncoder { get; set; }
+    JavaScriptEncoder? JavaScriptEncoder { get; set; }
 
-    UrlEncoder UrlEncoder { get; set; }
+    UrlEncoder? UrlEncoder { get; set; }
 
     Dictionary<string, object> GlobalContext { get; set; }
 
-    string Body { get; set; }
+    string? Body { get; set; }
 
     Task ExecuteAsync();
 
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/NotFoundProjectItem.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/NotFoundProjectItem.cs
index 5db2c8f582..2651237d2d 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/NotFoundProjectItem.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/NotFoundProjectItem.cs
@@ -6,7 +6,7 @@ namespace Volo.Abp.TextTemplating.Razor;
 
 internal class NotFoundProjectItem : RazorProjectItem
 {
-    public NotFoundProjectItem(string basePath, string path, string fileKind)
+    public NotFoundProjectItem(string basePath, string path, string? fileKind)
     {
         BasePath = basePath;
         FilePath = path;
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplatePageBase.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplatePageBase.cs
index fd2d2c13e7..a85d9d1480 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplatePageBase.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplatePageBase.cs
@@ -9,30 +9,30 @@ namespace Volo.Abp.TextTemplating.Razor;
 
 public abstract class RazorTemplatePageBase<TModel> : RazorTemplatePageBase, IRazorTemplatePage<TModel>
 {
-    public TModel Model { get; set; }
+    public TModel? Model { get; set; }
 }
 
 public abstract class RazorTemplatePageBase : IRazorTemplatePage
 {
-    public Dictionary<string, object> GlobalContext { get; set; }
+    public Dictionary<string, object> GlobalContext { get; set; } = default!;
 
-    public IServiceProvider ServiceProvider { get; set; }
+    public IServiceProvider ServiceProvider { get; set; } = default!;
 
-    public IStringLocalizer Localizer { get; set; }
+    public IStringLocalizer? Localizer { get; set; }
 
-    public HtmlEncoder HtmlEncoder { get; set; }
+    public HtmlEncoder? HtmlEncoder { get; set; }
 
-    public JavaScriptEncoder JavaScriptEncoder { get; set; }
+    public JavaScriptEncoder? JavaScriptEncoder { get; set; }
 
-    public UrlEncoder UrlEncoder { get; set; }
+    public UrlEncoder? UrlEncoder { get; set; }
 
-    public string Body { get; set; }
+    public string? Body { get; set; }
 
     private readonly StringBuilder _stringBuilder = new StringBuilder();
 
     private AttributeInfo _attributeInfo;
 
-    public virtual void WriteLiteral(string literal = null)
+    public virtual void WriteLiteral(string? literal = null)
     {
         if (!literal.IsNullOrEmpty())
         {
@@ -40,7 +40,7 @@ public abstract class RazorTemplatePageBase : IRazorTemplatePage
         }
     }
 
-    public virtual void Write(object value = null)
+    public virtual void Write(object? value = null)
     {
         if (value is null)
         {
diff --git a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplateRenderingEngine.cs b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplateRenderingEngine.cs
index 86298f2daf..2384bd8740 100644
--- a/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplateRenderingEngine.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Razor/Volo/Abp/TextTemplating/Razor/RazorTemplateRenderingEngine.cs
@@ -34,9 +34,9 @@ public class RazorTemplateRenderingEngine : TemplateRenderingEngineBase, ITransi
 
     public override async Task<string> RenderAsync(
         [NotNull] string templateName,
-        [CanBeNull] object model = null,
-        [CanBeNull] string cultureName = null,
-        [CanBeNull] Dictionary<string, object> globalContext = null)
+        object? model = null,
+        string? cultureName = null,
+        Dictionary<string, object>? globalContext = null)
     {
         Check.NotNullOrWhiteSpace(templateName, nameof(templateName));
 
@@ -70,9 +70,9 @@ public class RazorTemplateRenderingEngine : TemplateRenderingEngineBase, ITransi
 
     protected virtual async Task<string> RenderInternalAsync(
         string templateName,
-        string body,
+        string? body,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var templateDefinition = await TemplateDefinitionManager.GetAsync(templateName);
 
@@ -97,9 +97,9 @@ public class RazorTemplateRenderingEngine : TemplateRenderingEngineBase, ITransi
 
     protected virtual async Task<string> RenderSingleTemplateAsync(
         TemplateDefinition templateDefinition,
-        string body,
+        string? body,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         return await RenderTemplateContentWithRazorAsync(
             templateDefinition,
@@ -111,13 +111,13 @@ public class RazorTemplateRenderingEngine : TemplateRenderingEngineBase, ITransi
 
     protected virtual async Task<string> RenderTemplateContentWithRazorAsync(
         TemplateDefinition templateDefinition,
-        string body,
+        string? body,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var assembly = await AbpCompiledViewProvider.GetAssemblyAsync(templateDefinition);
-        var templateType = assembly.GetType(AbpRazorTemplateConsts.TypeName);
-        var template = (IRazorTemplatePage)Activator.CreateInstance(templateType);
+        var templateType = assembly.GetType(AbpRazorTemplateConsts.TypeName)!;
+        var template = (IRazorTemplatePage)Activator.CreateInstance(templateType)!;
 
         using (var scope = ServiceScopeFactory.CreateScope())
         {
@@ -147,11 +147,11 @@ public class RazorTemplateRenderingEngine : TemplateRenderingEngineBase, ITransi
         }
     }
 
-    private void SetModel<TModel>(IRazorTemplatePage razorTemplatePage, object model = null)
+    private void SetModel<TModel>(IRazorTemplatePage razorTemplatePage, object? model = null)
     {
         if (razorTemplatePage is IRazorTemplatePage<TModel> razorTemplatePageWithModel)
         {
-            razorTemplatePageWithModel.Model = (TModel)model;
+            razorTemplatePageWithModel.Model = (TModel?)model;
         }
     }
 }
diff --git a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo.Abp.TextTemplating.Scriban.csproj b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo.Abp.TextTemplating.Scriban.csproj
index d18d90c8f9..ea1d0f0f8d 100644
--- a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo.Abp.TextTemplating.Scriban.csproj
+++ b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo.Abp.TextTemplating.Scriban.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 
diff --git a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateLocalizer.cs b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateLocalizer.cs
index 91af004cf9..6bf32d1a58 100644
--- a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateLocalizer.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateLocalizer.cs
@@ -44,7 +44,7 @@ public class ScribanTemplateLocalizer : IScriptCustomFunction
         }
 
         var args = arguments.Skip(1).Where(x => x != null && !x.ToString().IsNullOrWhiteSpace()).ToArray();
-        return args.Any() ? _localizer[name.ToString(), args] : _localizer[name.ToString()];
+        return args.Any() ? _localizer[name.ToString()!, args] : _localizer[name.ToString()!];
     }
 
     public int RequiredParameterCount => 1;
diff --git a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateRenderingEngine.cs b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateRenderingEngine.cs
index a4da669893..7a5ac79592 100644
--- a/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateRenderingEngine.cs
+++ b/framework/src/Volo.Abp.TextTemplating.Scriban/Volo/Abp/TextTemplating/Scriban/ScribanTemplateRenderingEngine.cs
@@ -24,9 +24,9 @@ public class ScribanTemplateRenderingEngine : TemplateRenderingEngineBase, ITran
 
     public override async Task<string> RenderAsync(
         [NotNull] string templateName,
-        [CanBeNull] object model = null,
-        [CanBeNull] string cultureName = null,
-        [CanBeNull] Dictionary<string, object> globalContext = null)
+        object? model = null,
+        string? cultureName = null,
+        Dictionary<string, object>? globalContext = null)
     {
         Check.NotNullOrWhiteSpace(templateName, nameof(templateName));
 
@@ -59,7 +59,7 @@ public class ScribanTemplateRenderingEngine : TemplateRenderingEngineBase, ITran
     protected virtual async Task<string> RenderInternalAsync(
         string templateName,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var templateDefinition = await TemplateDefinitionManager.GetAsync(templateName);
 
@@ -84,13 +84,13 @@ public class ScribanTemplateRenderingEngine : TemplateRenderingEngineBase, ITran
     protected virtual async Task<string> RenderSingleTemplateAsync(
         TemplateDefinition templateDefinition,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var rawTemplateContent = await GetContentOrNullAsync(templateDefinition);
 
         return await RenderTemplateContentWithScribanAsync(
             templateDefinition,
-            rawTemplateContent,
+            rawTemplateContent!,
             globalContext,
             model
         );
@@ -100,7 +100,7 @@ public class ScribanTemplateRenderingEngine : TemplateRenderingEngineBase, ITran
         TemplateDefinition templateDefinition,
         string templateContent,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var context = CreateScribanTemplateContext(
             templateDefinition,
@@ -116,7 +116,7 @@ public class ScribanTemplateRenderingEngine : TemplateRenderingEngineBase, ITran
     protected virtual TemplateContext CreateScribanTemplateContext(
         TemplateDefinition templateDefinition,
         Dictionary<string, object> globalContext,
-        object model = null)
+        object? model = null)
     {
         var context = new TemplateContext();
 
diff --git a/framework/src/Volo.Abp.TextTemplating/Volo.Abp.TextTemplating.csproj b/framework/src/Volo.Abp.TextTemplating/Volo.Abp.TextTemplating.csproj
index 27907183c0..f8d1d85192 100644
--- a/framework/src/Volo.Abp.TextTemplating/Volo.Abp.TextTemplating.csproj
+++ b/framework/src/Volo.Abp.TextTemplating/Volo.Abp.TextTemplating.csproj
@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <RootNamespace />
   </PropertyGroup>