diff --git a/src/Volo.Abp/Microsoft/Extensions/DependencyInjection/ServiceCollectionRegistrationActionExtensions.cs b/src/Volo.Abp/Microsoft/Extensions/DependencyInjection/ServiceCollectionRegistrationActionExtensions.cs
index 923b4c6c5f..ace9e81d7f 100644
--- a/src/Volo.Abp/Microsoft/Extensions/DependencyInjection/ServiceCollectionRegistrationActionExtensions.cs
+++ b/src/Volo.Abp/Microsoft/Extensions/DependencyInjection/ServiceCollectionRegistrationActionExtensions.cs
@@ -5,6 +5,8 @@ namespace Microsoft.Extensions.DependencyInjection
 {
     public static class ServiceCollectionRegistrationActionExtensions
     {
+        // OnRegistred
+
         public static void OnRegistred(this IServiceCollection services, Action<IOnServiceRegistredContext> registrationAction)
         {
             GetOrCreateRegistrationActionList(services).Add(registrationAction);
@@ -27,6 +29,8 @@ namespace Microsoft.Extensions.DependencyInjection
             return actionList;
         }
 
+        // OnExposing
+
         public static void OnExposing(this IServiceCollection services, Action<IOnServiceExposingContext> exposeAction)
         {
             GetOrCreateExposingList(services).Add(exposeAction);
diff --git a/src/Volo.Abp/Volo/Abp/Reflection/AssemblyHelper.cs b/src/Volo.Abp/Volo/Abp/Reflection/AssemblyHelper.cs
index 6247095b3d..d8edf93064 100644
--- a/src/Volo.Abp/Volo/Abp/Reflection/AssemblyHelper.cs
+++ b/src/Volo.Abp/Volo/Abp/Reflection/AssemblyHelper.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
@@ -21,5 +22,17 @@ namespace Volo.Abp.Reflection
                 .EnumerateFiles(folderPath, "*.*", searchOption)
                 .Where(s => s.EndsWith(".dll") || s.EndsWith(".exe"));
         }
+
+        public static IReadOnlyList<Type> GetAllTypes(Assembly assembly)
+        {
+            try
+            {
+                return assembly.GetTypes();
+            }
+            catch (ReflectionTypeLoadException ex)
+            {
+                return ex.Types;
+            }
+        }
     }
 }
diff --git a/src/Volo.Abp/Volo/Abp/Reflection/TypeFinder.cs b/src/Volo.Abp/Volo/Abp/Reflection/TypeFinder.cs
index e1cfcb42bb..f70dffd7e9 100644
--- a/src/Volo.Abp/Volo/Abp/Reflection/TypeFinder.cs
+++ b/src/Volo.Abp/Volo/Abp/Reflection/TypeFinder.cs
@@ -1,11 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Reflection;
 using System.Threading;
 using Microsoft.Extensions.Logging;
 using Volo.DependencyInjection;
-using Volo.ExtensionMethods.Collections.Generic;
 
 namespace Volo.Abp.Reflection
 {
@@ -35,18 +33,9 @@ namespace Volo.Abp.Reflection
             {
                 try
                 {
-                    Type[] typesInThisAssembly;
+                    var typesInThisAssembly = AssemblyHelper.GetAllTypes(assembly);
 
-                    try
-                    {
-                        typesInThisAssembly = assembly.GetTypes();
-                    }
-                    catch (ReflectionTypeLoadException ex)
-                    {
-                        typesInThisAssembly = ex.Types;
-                    }
-
-                    if (typesInThisAssembly.IsNullOrEmpty())
+                    if (!typesInThisAssembly.Any())
                     {
                         continue;
                     }
diff --git a/src/Volo.Abp/Volo/DependencyInjection/ConventionalRegistrarBase.cs b/src/Volo.Abp/Volo/DependencyInjection/ConventionalRegistrarBase.cs
index e15c6037f0..e346a01ba3 100644
--- a/src/Volo.Abp/Volo/DependencyInjection/ConventionalRegistrarBase.cs
+++ b/src/Volo.Abp/Volo/DependencyInjection/ConventionalRegistrarBase.cs
@@ -2,7 +2,7 @@
 using System.Linq;
 using System.Reflection;
 using Microsoft.Extensions.DependencyInjection;
-using Volo.Internal;
+using Volo.Abp.Reflection;
 
 namespace Volo.DependencyInjection
 {
diff --git a/src/Volo.Abp/Volo/Internal/AssemblyHelper.cs b/src/Volo.Abp/Volo/Internal/AssemblyHelper.cs
deleted file mode 100644
index bf82776566..0000000000
--- a/src/Volo.Abp/Volo/Internal/AssemblyHelper.cs
+++ /dev/null
@@ -1,21 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Reflection;
-
-namespace Volo.Internal
-{
-    internal static class AssemblyHelper
-    {
-        public static IReadOnlyList<Type> GetAllTypes(Assembly assembly)
-        {
-            try
-            {
-                return assembly.GetTypes();
-            }
-            catch (ReflectionTypeLoadException ex)
-            {
-                return ex.Types;
-            }
-        }
-    }
-}
\ No newline at end of file