Prevent ApiTypeNameHelper infinite loop.

framework/Volo.Abp.sln

@@ -357,6 +357,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Volo.Abp.Swashbuckle", "src
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Volo.Abp.Json.Tests", "test\Volo.Abp.Json.Tests\Volo.Abp.Json.Tests.csproj", "{00D07595-993C-40FC-BD90-0DD6331414D3}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Volo.Abp.Http.Tests", "test\Volo.Abp.Http.Tests\Volo.Abp.Http.Tests.csproj", "{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1063,6 +1065,10 @@ Global
 		{00D07595-993C-40FC-BD90-0DD6331414D3}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{00D07595-993C-40FC-BD90-0DD6331414D3}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{00D07595-993C-40FC-BD90-0DD6331414D3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1243,6 +1249,7 @@ Global
 		{89840441-5A3A-4FD7-9CB4-E5B52FAEF72A} = {5DF0E140-0513-4D0D-BE2E-3D4D85CD70E6}
 		{DD9519E0-5A68-48DC-A051-7BF2AC922F3E} = {5DF0E140-0513-4D0D-BE2E-3D4D85CD70E6}
 		{00D07595-993C-40FC-BD90-0DD6331414D3} = {447C8A77-E5F0-4538-8687-7383196D04EA}
+		{A37BFEB5-7C57-4CDC-93B8-B5CE4BB9ACE1} = {447C8A77-E5F0-4538-8687-7383196D04EA}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {BB97ECF4-9A84-433F-A80B-2A3285BDD1D5}

framework/src/Volo.Abp.Http/Volo/Abp/Http/Modeling/ApiTypeNameHelper.cs

@@ -1,20 +1,28 @@
 using System;
+using Volo.Abp.Collections;
 using Volo.Abp.Reflection;
 
 namespace Volo.Abp.Http.Modeling
 {
     public static class ApiTypeNameHelper
     {
+        private static ITypeList _cycleType = new TypeList();
+
         public static string GetTypeName(Type type)
         {
             if (TypeHelper.IsDictionary(type, out var keyType, out var valueType))
             {
-                return $"{{{GetTypeName(keyType)}:{GetTypeName(valueType)}}}";
+                if (keyType != type && valueType != type)
+                {
+                    return $"{{{GetTypeName(keyType)}:{GetTypeName(valueType)}}}";
+                }
             }
-
-            if (TypeHelper.IsEnumerable(type, out var itemType, includePrimitives: false))
+            else if (TypeHelper.IsEnumerable(type, out var itemType, includePrimitives: false))
             {
-                return $"[{GetTypeName(itemType)}]";
+                if (itemType != type)
+                {
+                    return $"[{GetTypeName(itemType)}]";
+                }
             }
 
             return TypeHelper.GetFullNameHandlingNullableAndGenerics(type);
@@ -24,12 +32,17 @@ namespace Volo.Abp.Http.Modeling
         {
             if (TypeHelper.IsDictionary(type, out var keyType, out var valueType))
             {
-                return  $"{{{GetSimpleTypeName(keyType)}:{GetSimpleTypeName(valueType)}}}";
+                if (keyType != type && valueType != type)
+                {
+                    return  $"{{{GetSimpleTypeName(keyType)}:{GetSimpleTypeName(valueType)}}}";
+                }
             }
-
-            if (TypeHelper.IsEnumerable(type, out var itemType, includePrimitives: false))
+            else if (TypeHelper.IsEnumerable(type, out var itemType, includePrimitives: false))
             {
-                return  $"[{GetSimpleTypeName(itemType)}]";
+                if (itemType != type)
+                {
+                    return  $"[{GetSimpleTypeName(itemType)}]";
+                }
             }
 
             return TypeHelper.GetSimplifiedName(type);

framework/test/Volo.Abp.Http.Tests/Volo.Abp.Http.Tests.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <Import Project="..\..\..\common.test.props" />
+
+    <PropertyGroup>
+        <TargetFramework>net5.0</TargetFramework>
+        <RootNamespace />
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\Volo.Abp.Http\Volo.Abp.Http.csproj" />
+        <ProjectReference Include="..\AbpTestBase\AbpTestBase.csproj" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
+    </ItemGroup>
+
+</Project>

framework/test/Volo.Abp.Http.Tests/Volo/Abp/Http/AbpHttpTestModule.cs

@@ -0,0 +1,10 @@
+using Volo.Abp.Modularity;
+
+namespace Volo.Abp.Http
+{
+    [DependsOn(typeof(AbpHttpModule))]
+    public class AbpHttpTestModule : AbpModule
+    {
+
+    }
+}

framework/test/Volo.Abp.Http.Tests/Volo/Abp/Http/ApiTypeNameHelper_Tests.cs

@@ -0,0 +1,44 @@
+using System.Collections;
+using System.Collections.Generic;
+using Shouldly;
+using Volo.Abp.Http.Modeling;
+using Volo.Abp.Reflection;
+using Xunit;
+
+namespace Volo.Abp.Http
+{
+    public class ApiTypeNameHelper_Tests
+    {
+        [Fact]
+        public void GetTypeName_Test()
+        {
+            ApiTypeNameHelper.GetTypeName(typeof(CycleClass)).ShouldBe(TypeHelper.GetFullNameHandlingNullableAndGenerics(typeof(CycleClass)));
+            ApiTypeNameHelper.GetTypeName(typeof(CycleClass2)).ShouldBe(TypeHelper.GetFullNameHandlingNullableAndGenerics(typeof(CycleClass2)));
+        }
+
+        [Fact]
+        public void GetSimpleTypeName_Test()
+        {
+            ApiTypeNameHelper.GetSimpleTypeName(typeof(CycleClass)).ShouldBe(TypeHelper.GetSimplifiedName(typeof(CycleClass)));
+            ApiTypeNameHelper.GetSimpleTypeName(typeof(CycleClass2)).ShouldBe(TypeHelper.GetSimplifiedName(typeof(CycleClass2)));
+        }
+
+        class CycleClass : IEnumerable<CycleClass>
+        {
+            public IEnumerator<CycleClass> GetEnumerator()
+            {
+                yield return new CycleClass();
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return GetEnumerator();
+            }
+        }
+
+        class CycleClass2 : Dictionary<CycleClass2, CycleClass2>
+        {
+
+        }
+    }
+}