diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/DaprAspNetCore/AbpDaprEndpointRouteBuilderExtensions.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/DaprAspNetCore/AbpDaprEndpointRouteBuilderExtensions.cs
index b5866c5a68..24f68ef9ab 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/DaprAspNetCore/AbpDaprEndpointRouteBuilderExtensions.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/DaprAspNetCore/AbpDaprEndpointRouteBuilderExtensions.cs
@@ -30,7 +30,7 @@ namespace Dapr
         /// <summary>
         /// An optional delegate used to configure the subscriptions.
         /// </summary>
-        public Func<List<AbpSubscription>, Task> SubscriptionsCallback { get; set; }
+        public Func<List<AbpSubscription>, Task>? SubscriptionsCallback { get; set; }
     }
 
     /// <summary>
@@ -41,32 +41,32 @@ namespace Dapr
         /// <summary>
         /// Gets or sets the topic name.
         /// </summary>
-        public string Topic { get; set; }
+        public string Topic { get; set; } = default!;
 
         /// <summary>
         /// Gets or sets the pubsub name
         /// </summary>
-        public string PubsubName { get; set; }
+        public string PubsubName { get; set; } = default!;
 
         /// <summary>
         /// Gets or sets the route
         /// </summary>
-        public string Route { get; set; }
+        public string? Route { get; set; }
 
         /// <summary>
         /// Gets or sets the routes
         /// </summary>
-        public AbpRoutes Routes { get; set; }
+        public AbpRoutes? Routes { get; set; }
 
         /// <summary>
         /// Gets or sets the metadata.
         /// </summary>
-        public AbpMetadata Metadata { get; set; }
+        public AbpMetadata? Metadata { get; set; }
 
         /// <summary>
         /// Gets or sets the deadletter topic.
         /// </summary>
-        public string DeadLetterTopic { get; set; }
+        public string? DeadLetterTopic { get; set; }
     }
 
     /// <summary>
@@ -99,12 +99,12 @@ namespace Dapr
         /// <summary>
         /// Gets or sets the default route
         /// </summary>
-        public string Default { get; set; }
+        public string? Default { get; set; }
 
         /// <summary>
         /// Gets or sets the routing rules
         /// </summary>
-        public List<AbpRule> Rules { get; set; }
+        public List<AbpRule>? Rules { get; set; }
     }
 
     /// <summary>
@@ -115,12 +115,12 @@ namespace Dapr
         /// <summary>
         /// Gets or sets the CEL expression to match this route.
         /// </summary>
-        public string Match { get; set; }
+        public string Match { get; set; } = default!;
 
         /// <summary>
         /// Gets or sets the path of the route.
         /// </summary>
-        public string Path { get; set; }
+        public string Path { get; set; } = default!;
     }
 }
 
@@ -166,7 +166,7 @@ namespace Microsoft.AspNetCore.Builder
             return CreateSubscribeEndPoint(endpoints, options);
         }
 
-        private static IEndpointConventionBuilder CreateSubscribeEndPoint(IEndpointRouteBuilder endpoints, AbpSubscribeOptions options = null)
+        private static IEndpointConventionBuilder CreateSubscribeEndPoint(IEndpointRouteBuilder endpoints, AbpSubscribeOptions? options = null)
         {
             if (endpoints is null)
             {
@@ -175,7 +175,7 @@ namespace Microsoft.AspNetCore.Builder
 
             return endpoints.MapGet("dapr/subscribe", async context =>
             {
-                var logger = context.RequestServices.GetRequiredService<ILoggerFactory>().CreateLogger("DaprTopicSubscription");
+                var logger = context.RequestServices.GetService<ILoggerFactory>()?.CreateLogger("DaprTopicSubscription");
                 var dataSource = context.RequestServices.GetRequiredService<EndpointDataSource>();
                 var subscriptions = dataSource.Endpoints
                     .OfType<RouteEndpoint>()
@@ -185,7 +185,7 @@ namespace Microsoft.AspNetCore.Builder
                         var topicMetadata = e.Metadata.GetOrderedMetadata<ITopicMetadata>();
                         var originalTopicMetadata = e.Metadata.GetOrderedMetadata<IOriginalTopicMetadata>();
 
-                        var subs = new List<(string PubsubName, string Name, string DeadLetterTopic, bool? EnableRawPayload, string Match, int Priority, Dictionary<string, string[]> OriginalTopicMetadata, string MetadataSeparator, RoutePattern RoutePattern)>();
+                        var subs = new List<(string PubsubName, string Name, string? DeadLetterTopic, bool? EnableRawPayload, string Match, int Priority, Dictionary<string, string[]> OriginalTopicMetadata, string? MetadataSeparator, RoutePattern RoutePattern)>();
 
                         for (int i = 0; i < topicMetadata.Count(); i++)
                         {
@@ -211,7 +211,7 @@ namespace Microsoft.AspNetCore.Builder
                     {
                         var first = e.First();
                         var rawPayload = e.Any(e => e.EnableRawPayload.GetValueOrDefault());
-                        var metadataSeparator = e.FirstOrDefault(e => !string.IsNullOrEmpty(e.MetadataSeparator)).MetadataSeparator ?? ",";
+                        var metadataSeparator = e.FirstOrDefault(e => !string.IsNullOrEmpty(e.MetadataSeparator)).MetadataSeparator?.ToString() ?? ",";
                         var rules = e.Where(e => !string.IsNullOrEmpty(e.Match)).ToList();
                         var defaultRoutes = e.Where(e => string.IsNullOrEmpty(e.Match)).Select(e => RoutePatternToString(e.RoutePattern)).ToList();
                         var defaultRoute = defaultRoutes.FirstOrDefault();
@@ -276,7 +276,7 @@ namespace Microsoft.AspNetCore.Builder
                     .OrderBy(e => (e.PubsubName, e.Topic))
                     .ToList();
 
-                await options?.SubscriptionsCallback(subscriptions);
+                await options?.SubscriptionsCallback!(subscriptions)!;
                 await context.Response.WriteAsync(JsonSerializer.Serialize(subscriptions,
                     new JsonSerializerOptions
                     {
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus.csproj b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus.csproj
index f31ded0e06..96b196b67f 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus.csproj
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo/Abp/AspNetCore/Mvc/Dapr/EventBus/Controllers/AbpAspNetCoreMvcDaprEventsController.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo/Abp/AspNetCore/Mvc/Dapr/EventBus/Controllers/AbpAspNetCoreMvcDaprEventsController.cs
index b1d5bac7fb..946c39f59c 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo/Abp/AspNetCore/Mvc/Dapr/EventBus/Controllers/AbpAspNetCoreMvcDaprEventsController.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr.EventBus/Volo/Abp/AspNetCore/Mvc/Dapr/EventBus/Controllers/AbpAspNetCoreMvcDaprEventsController.cs
@@ -41,8 +41,8 @@ public class AbpAspNetCoreMvcDaprEventsController : AbpController
         }
         else
         {
-            var eventData = daprSerializer.Deserialize(data, distributedEventBus.GetEventType(topic));
-            await distributedEventBus.TriggerHandlersAsync(distributedEventBus.GetEventType(topic), eventData);
+            var eventData = daprSerializer.Deserialize(data, distributedEventBus.GetEventType(topic!));
+            await distributedEventBus.TriggerHandlersAsync(distributedEventBus.GetEventType(topic!), eventData);
         }
 
         return Ok();
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo.Abp.AspNetCore.Mvc.Dapr.csproj b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo.Abp.AspNetCore.Mvc.Dapr.csproj
index 03bb453ba2..1839113d06 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo.Abp.AspNetCore.Mvc.Dapr.csproj
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo.Abp.AspNetCore.Mvc.Dapr.csproj
@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprAppApiTokenValidator.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprAppApiTokenValidator.cs
index dd0c6a5300..aa7d17072b 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprAppApiTokenValidator.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprAppApiTokenValidator.cs
@@ -50,9 +50,9 @@ public class DaprAppApiTokenValidator : IDaprAppApiTokenValidator, ISingletonDep
         return expectedAppApiToken == headerAppApiToken;
     }
 
-    public virtual string GetDaprAppApiTokenOrNull()
+    public virtual string? GetDaprAppApiTokenOrNull()
     {
-        string apiTokenHeader = HttpContext.Request.Headers["dapr-api-token"];
+        string? apiTokenHeader = HttpContext.Request.Headers["dapr-api-token"];
         if (string.IsNullOrEmpty(apiTokenHeader) || apiTokenHeader.Length < 1)
         {
             return null;
@@ -61,7 +61,7 @@ public class DaprAppApiTokenValidator : IDaprAppApiTokenValidator, ISingletonDep
         return apiTokenHeader;
     }
 
-    protected virtual string GetConfiguredAppApiTokenOrNull()
+    protected virtual string? GetConfiguredAppApiTokenOrNull()
     {
         return HttpContext
             .RequestServices
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprHttpContextExtensions.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprHttpContextExtensions.cs
index aa81765b12..e73eaec4f7 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprHttpContextExtensions.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/DaprHttpContextExtensions.cs
@@ -22,7 +22,7 @@ public static class DaprHttpContextExtensions
             .IsValidDaprAppApiToken();
     }
 
-    public static string GetDaprAppApiTokenOrNull(HttpContext httpContext)
+    public static string? GetDaprAppApiTokenOrNull(HttpContext httpContext)
     {
         return httpContext
             .RequestServices
diff --git a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/IDaprAppApiTokenValidator.cs b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/IDaprAppApiTokenValidator.cs
index 66fd833b77..f54f0aa8cf 100644
--- a/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/IDaprAppApiTokenValidator.cs
+++ b/framework/src/Volo.Abp.AspNetCore.Mvc.Dapr/Volo/Abp/AspNetCore/Mvc/Dapr/IDaprAppApiTokenValidator.cs
@@ -6,5 +6,5 @@ public interface IDaprAppApiTokenValidator
 
     bool IsValidDaprAppApiToken();
 
-    string GetDaprAppApiTokenOrNull();
+    string? GetDaprAppApiTokenOrNull();
 }