diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo.Abp.AspNetCore.Components.csproj b/framework/src/Volo.Abp.AspNetCore.Components/Volo.Abp.AspNetCore.Components.csproj
index 95c23d34ad..865ccb9f75 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo.Abp.AspNetCore.Components.csproj
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo.Abp.AspNetCore.Components.csproj
@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.AspNetCore.Components</AssemblyName>
     <PackageId>Volo.Abp.AspNetCore.Components</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/AbpComponentBase.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/AbpComponentBase.cs
index 47a0d570bf..6f2df20de8 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/AbpComponentBase.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/AbpComponentBase.cs
@@ -20,8 +20,8 @@ namespace Volo.Abp.AspNetCore.Components;
 
 public abstract class AbpComponentBase : OwningComponentBase
 {
-    protected IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory);
-    private IStringLocalizerFactory _stringLocalizerFactory;
+    protected IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory)!;
+    private IStringLocalizerFactory? _stringLocalizerFactory;
 
     protected IStringLocalizer L {
         get {
@@ -33,46 +33,46 @@ public abstract class AbpComponentBase : OwningComponentBase
             return _localizer;
         }
     }
-    private IStringLocalizer _localizer;
+    private IStringLocalizer? _localizer;
 
-    protected Type LocalizationResource {
+    protected Type? LocalizationResource {
         get => _localizationResource;
         set {
             _localizationResource = value;
             _localizer = null;
         }
     }
-    private Type _localizationResource = typeof(DefaultResource);
+    private Type? _localizationResource = typeof(DefaultResource);
 
     protected ILogger Logger => _lazyLogger.Value;
-    private Lazy<ILogger> _lazyLogger => new Lazy<ILogger>(() => LoggerFactory?.CreateLogger(GetType().FullName) ?? NullLogger.Instance, true);
+    private Lazy<ILogger> _lazyLogger => new Lazy<ILogger>(() => LoggerFactory?.CreateLogger(GetType().FullName!) ?? NullLogger.Instance, true);
 
-    protected ILoggerFactory LoggerFactory => LazyGetRequiredService(ref _loggerFactory);
-    private ILoggerFactory _loggerFactory;
+    protected ILoggerFactory LoggerFactory => LazyGetRequiredService(ref _loggerFactory)!;
+    private ILoggerFactory? _loggerFactory;
 
-    protected IAuthorizationService AuthorizationService => LazyGetRequiredService(ref _authorizationService);
-    private IAuthorizationService _authorizationService;
+    protected IAuthorizationService AuthorizationService => LazyGetRequiredService(ref _authorizationService)!;
+    private IAuthorizationService? _authorizationService;
 
-    protected ICurrentUser CurrentUser => LazyGetRequiredService(ref _currentUser);
-    private ICurrentUser _currentUser;
+    protected ICurrentUser CurrentUser => LazyGetRequiredService(ref _currentUser)!;
+    private ICurrentUser? _currentUser;
 
-    protected ICurrentTenant CurrentTenant => LazyGetRequiredService(ref _currentTenant);
-    private ICurrentTenant _currentTenant;
+    protected ICurrentTenant CurrentTenant => LazyGetRequiredService(ref _currentTenant)!;
+    private ICurrentTenant? _currentTenant;
 
-    protected IUiMessageService Message => LazyGetNonScopedRequiredService(ref _message);
-    private IUiMessageService _message;
+    protected IUiMessageService Message => LazyGetNonScopedRequiredService(ref _message)!;
+    private IUiMessageService? _message;
 
-    protected IUiNotificationService Notify => LazyGetNonScopedRequiredService(ref _notify);
-    private IUiNotificationService _notify;
+    protected IUiNotificationService Notify => LazyGetNonScopedRequiredService(ref _notify)!;
+    private IUiNotificationService? _notify;
 
-    protected IUserExceptionInformer UserExceptionInformer => LazyGetNonScopedRequiredService(ref _userExceptionInformer);
-    private IUserExceptionInformer _userExceptionInformer;
+    protected IUserExceptionInformer UserExceptionInformer => LazyGetNonScopedRequiredService(ref _userExceptionInformer)!;
+    private IUserExceptionInformer? _userExceptionInformer;
 
-    protected IAlertManager AlertManager => LazyGetNonScopedRequiredService(ref _alertManager);
-    private IAlertManager _alertManager;
+    protected IAlertManager AlertManager => LazyGetNonScopedRequiredService(ref _alertManager)!;
+    private IAlertManager? _alertManager;
 
-    protected IClock Clock => LazyGetNonScopedRequiredService(ref _clock);
-    private IClock _clock;
+    protected IClock Clock => LazyGetNonScopedRequiredService(ref _clock)!;
+    private IClock? _clock;
 
     protected AlertList Alerts => AlertManager.Alerts;
 
@@ -85,19 +85,19 @@ public abstract class AbpComponentBase : OwningComponentBase
 
             if (ObjectMapperContext == null)
             {
-                return LazyGetRequiredService(ref _objectMapper);
+                return LazyGetRequiredService(ref _objectMapper)!;
             }
 
             return LazyGetRequiredService(
                 typeof(IObjectMapper<>).MakeGenericType(ObjectMapperContext),
                 ref _objectMapper
-            );
+            )!;
         }
     }
 
-    private IObjectMapper _objectMapper;
+    private IObjectMapper? _objectMapper;
 
-    protected Type ObjectMapperContext { get; set; }
+    protected Type? ObjectMapperContext { get; set; }
 
     protected TService LazyGetRequiredService<TService>(ref TService reference) => LazyGetRequiredService(typeof(TService), ref reference);
 
@@ -111,13 +111,13 @@ public abstract class AbpComponentBase : OwningComponentBase
         return reference;
     }
 
-    protected TService LazyGetService<TService>(ref TService reference) => LazyGetService(typeof(TService), ref reference);
+    protected TService? LazyGetService<TService>(ref TService? reference) => LazyGetService(typeof(TService), ref reference);
 
-    protected TRef LazyGetService<TRef>(Type serviceType, ref TRef reference)
+    protected TRef? LazyGetService<TRef>(Type serviceType, ref TRef? reference)
     {
         if (reference == null)
         {
-            reference = (TRef)ScopedServices.GetService(serviceType);
+            reference = (TRef?)ScopedServices.GetService(serviceType);
         }
 
         return reference;
@@ -135,20 +135,20 @@ public abstract class AbpComponentBase : OwningComponentBase
         return reference;
     }
 
-    protected TService LazyGetNonScopedService<TService>(ref TService reference) => LazyGetNonScopedService(typeof(TService), ref reference);
+    protected TService? LazyGetNonScopedService<TService>(ref TService? reference) => LazyGetNonScopedService(typeof(TService), ref reference);
 
-    protected TRef LazyGetNonScopedService<TRef>(Type serviceType, ref TRef reference)
+    protected TRef? LazyGetNonScopedService<TRef>(Type serviceType, ref TRef? reference)
     {
         if (reference == null)
         {
-            reference = (TRef)NonScopedServices.GetService(serviceType);
+            reference = (TRef?)NonScopedServices.GetService(serviceType);
         }
 
         return reference;
     }
 
     [Inject]
-    protected IServiceProvider NonScopedServices { get; set; }
+    protected IServiceProvider NonScopedServices { get; set; } = default!;
 
     protected virtual IStringLocalizer CreateLocalizer()
     {
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertList.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertList.cs
index 6ea0031352..f450033b01 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertList.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertList.cs
@@ -9,27 +9,27 @@ namespace Volo.Abp.AspNetCore.Components.Alerts;
 
 public class AlertList : ObservableCollection<AlertMessage>
 {
-    public void Add(AlertType type, string text, string title = null, bool dismissible = true)
+    public void Add(AlertType type, string text, string? title = null, bool dismissible = true)
     {
         Add(new AlertMessage(type, text, title, dismissible));
     }
 
-    public void Info(string text, string title = null, bool dismissible = true)
+    public void Info(string text, string? title = null, bool dismissible = true)
     {
         Add(new AlertMessage(AlertType.Info, text, title, dismissible));
     }
 
-    public void Warning(string text, string title = null, bool dismissible = true)
+    public void Warning(string text, string? title = null, bool dismissible = true)
     {
         Add(new AlertMessage(AlertType.Warning, text, title, dismissible));
     }
 
-    public void Danger(string text, string title = null, bool dismissible = true)
+    public void Danger(string text, string? title = null, bool dismissible = true)
     {
         Add(new AlertMessage(AlertType.Danger, text, title, dismissible));
     }
 
-    public void Success(string text, string title = null, bool dismissible = true)
+    public void Success(string text, string? title = null, bool dismissible = true)
     {
         Add(new AlertMessage(AlertType.Success, text, title, dismissible));
     }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertMessage.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertMessage.cs
index 7a38e422a0..15de91599b 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertMessage.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Alerts/AlertMessage.cs
@@ -9,16 +9,15 @@ public class AlertMessage
         get => _text;
         set => _text = Check.NotNullOrWhiteSpace(value, nameof(value));
     }
-    private string _text;
+    private string _text = default!;
 
     public AlertType Type { get; set; }
 
-    [CanBeNull]
-    public string Title { get; set; }
+    public string? Title { get; set; }
 
     public bool Dismissible { get; set; }
 
-    public AlertMessage(AlertType type, [NotNull] string text, string title = null, bool dismissible = true)
+    public AlertMessage(AlertType type, [NotNull] string text, string? title = null, bool dismissible = true)
     {
         Type = type;
         Text = Check.NotNullOrWhiteSpace(text, nameof(text));
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/IUiMessageService.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/IUiMessageService.cs
index 86e878d2a9..9e8d65fdde 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/IUiMessageService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/IUiMessageService.cs
@@ -5,13 +5,13 @@ namespace Volo.Abp.AspNetCore.Components.Messages;
 
 public interface IUiMessageService
 {
-    Task Info(string message, string title = null, Action<UiMessageOptions> options = null);
+    Task Info(string message, string? title = null, Action<UiMessageOptions>? options = null);
 
-    Task Success(string message, string title = null, Action<UiMessageOptions> options = null);
+    Task Success(string message, string? title = null, Action<UiMessageOptions>? options = null);
 
-    Task Warn(string message, string title = null, Action<UiMessageOptions> options = null);
+    Task Warn(string message, string? title = null, Action<UiMessageOptions>? options = null);
 
-    Task Error(string message, string title = null, Action<UiMessageOptions> options = null);
+    Task Error(string message, string? title = null, Action<UiMessageOptions>? options = null);
 
-    Task<bool> Confirm(string message, string title = null, Action<UiMessageOptions> options = null);
+    Task<bool> Confirm(string message, string? title = null, Action<UiMessageOptions>? options = null);
 }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/UiMessageEventArgs.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/UiMessageEventArgs.cs
index 4d73fb2812..adae13a4c2 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/UiMessageEventArgs.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Messages/UiMessageEventArgs.cs
@@ -30,5 +30,5 @@ public class UiMessageEventArgs : EventArgs
 
     public UiMessageOptions Options { get; }
 
-    public TaskCompletionSource<bool> Callback { get; }
+    public TaskCompletionSource<bool> Callback { get; } = default!;
 }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/IUiNotificationService.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/IUiNotificationService.cs
index 394fdec2a7..d637943af0 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/IUiNotificationService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/IUiNotificationService.cs
@@ -5,11 +5,11 @@ namespace Volo.Abp.AspNetCore.Components.Notifications;
 
 public interface IUiNotificationService
 {
-    Task Info(string message, string title = null, Action<UiNotificationOptions> options = null);
+    Task Info(string message, string? title = null, Action<UiNotificationOptions>? options = null);
 
-    Task Success(string message, string title = null, Action<UiNotificationOptions> options = null);
+    Task Success(string message, string? title = null, Action<UiNotificationOptions>? options = null);
 
-    Task Warn(string message, string title = null, Action<UiNotificationOptions> options = null);
+    Task Warn(string message, string? title = null, Action<UiNotificationOptions>? options = null);
 
-    Task Error(string message, string title = null, Action<UiNotificationOptions> options = null);
+    Task Error(string message, string? title = null, Action<UiNotificationOptions>? options = null);
 }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/NullUiNotificationService.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/NullUiNotificationService.cs
index 6c47586325..e75b1f3524 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/NullUiNotificationService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Notifications/NullUiNotificationService.cs
@@ -6,21 +6,21 @@ namespace Volo.Abp.AspNetCore.Components.Notifications;
 
 public class NullUiNotificationService : IUiNotificationService, ITransientDependency
 {
-    public Task Info(string message, string title = null, Action<UiNotificationOptions> options = null)
+    public Task Info(string message, string? title = null, Action<UiNotificationOptions>? options = null)
     {
         return Task.CompletedTask;
     }
 
-    public Task Success(string message, string title = null, Action<UiNotificationOptions> options = null)
+    public Task Success(string message, string? title = null, Action<UiNotificationOptions>? options = null)
     {
         return Task.CompletedTask;
     }
 
-    public Task Warn(string message, string title = null, Action<UiNotificationOptions> options = null)
+    public Task Warn(string message, string? title = null, Action<UiNotificationOptions>? options = null)
     {
         return Task.CompletedTask;
     }
-    public Task Error(string message, string title = null, Action<UiNotificationOptions> options = null)
+    public Task Error(string message, string? title = null, Action<UiNotificationOptions>? options = null)
     {
         return Task.CompletedTask;
     }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/IUiPageProgressService.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/IUiPageProgressService.cs
index 156c763722..1d32c86dc0 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/IUiPageProgressService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/IUiPageProgressService.cs
@@ -16,5 +16,5 @@ public interface IUiPageProgressService
     /// <param name="percentage">Value of the progress from 0 to 100, or null for indeterminate progress.</param>
     /// <param name="options">Additional options.</param>
     /// <returns>Awaitable task.</returns>
-    Task Go(int? percentage, Action<UiPageProgressOptions> options = null);
+    Task Go(int? percentage, Action<UiPageProgressOptions>? options = null);
 }
diff --git a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/NullUiPageProgressService.cs b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/NullUiPageProgressService.cs
index 2277122418..52f97f23d5 100644
--- a/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/NullUiPageProgressService.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Components/Volo/Abp/AspNetCore/Components/Progression/NullUiPageProgressService.cs
@@ -6,9 +6,9 @@ namespace Volo.Abp.AspNetCore.Components.Progression;
 
 public class NullUiPageProgressService : IUiPageProgressService, ISingletonDependency
 {
-    public event EventHandler<UiPageProgressEventArgs> ProgressChanged;
+    public event EventHandler<UiPageProgressEventArgs> ProgressChanged = default!;
 
-    public Task Go(int? percentage, Action<UiPageProgressOptions> options = null)
+    public Task Go(int? percentage, Action<UiPageProgressOptions>? options = null)
     {
         return Task.CompletedTask;
     }