Enable nullable annotations for Volo.Abp.HangFire

framework/src/Volo.Abp.HangFire/Volo.Abp.HangFire.csproj

@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.HangFire</AssemblyName>
     <PackageId>Volo.Abp.HangFire</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.HangFire/Volo/Abp/Hangfire/AbpHangfireAuthorizationFilter.cs

@@ -10,9 +10,9 @@ namespace Volo.Abp.Hangfire;
 public class AbpHangfireAuthorizationFilter : IDashboardAsyncAuthorizationFilter
 {
     private readonly bool _enableTenant;
-    private readonly string _requiredPermissionName;
+    private readonly string? _requiredPermissionName;
 
-    public AbpHangfireAuthorizationFilter(bool enableTenant = false, string requiredPermissionName = null)
+    public AbpHangfireAuthorizationFilter(bool enableTenant = false, string? requiredPermissionName = null)
     {
         _enableTenant = requiredPermissionName.IsNullOrWhiteSpace() ? enableTenant : true;
         _requiredPermissionName = requiredPermissionName;
@@ -30,7 +30,7 @@ public class AbpHangfireAuthorizationFilter : IDashboardAsyncAuthorizationFilter
             return true;
         }
 
-        return await IsPermissionGrantedAsync(context, _requiredPermissionName);
+        return await IsPermissionGrantedAsync(context, _requiredPermissionName!);
     }
 
     private static bool IsLoggedIn(DashboardContext context, bool enableTenant)

framework/src/Volo.Abp.HangFire/Volo/Abp/Hangfire/AbpHangfireModule.cs

@@ -9,7 +9,7 @@ namespace Volo.Abp.Hangfire;
 [DependsOn(typeof(AbpAuthorizationAbstractionsModule))]
 public class AbpHangfireModule : AbpModule
 {
-    private AbpHangfireBackgroundJobServer _backgroundJobServer;
+    private AbpHangfireBackgroundJobServer? _backgroundJobServer;
 
     public override void ConfigureServices(ServiceConfigurationContext context)
     {

framework/src/Volo.Abp.HangFire/Volo/Abp/Hangfire/AbpHangfireOptions.cs

@@ -12,14 +12,11 @@ namespace Volo.Abp.Hangfire;
 
 public class AbpHangfireOptions
 {
-    [CanBeNull]
-    public BackgroundJobServerOptions ServerOptions { get; set; }
+    public BackgroundJobServerOptions? ServerOptions { get; set; }
 
-    [CanBeNull]
-    public IEnumerable<IBackgroundProcess> AdditionalProcesses { get; set; }
+    public IEnumerable<IBackgroundProcess>? AdditionalProcesses { get; set; }
 
-    [CanBeNull]
-    public JobStorage Storage { get; set; }
+    public JobStorage? Storage { get; set; }
 
     [NotNull]
     public Func<IServiceProvider, BackgroundJobServer> BackgroundJobServerFactory {