Fix TypeHelper.IsDictionary and add tests.

framework/src/Volo.Abp.Core/Volo/Abp/Reflection/TypeHelper.cs

@@ -84,11 +84,16 @@ namespace Volo.Abp.Reflection
 
         public static bool IsDictionary(Type type, out Type keyType, out Type valueType)
         {
-            var enumerableTypes = ReflectionHelper.GetImplementedGenericTypes(type, typeof(IDictionary<,>));
-            if (enumerableTypes.Count == 1)
+            var dictionaryTypes = ReflectionHelper
+                .GetImplementedGenericTypes(
+                    type,
+                    typeof(IDictionary<,>)
+                );
+
+            if (dictionaryTypes.Count == 1)
             {
-                keyType = enumerableTypes[0].GenericTypeArguments[0];
-                valueType = enumerableTypes[0].GenericTypeArguments[2];
+                keyType = dictionaryTypes[0].GenericTypeArguments[0];
+                valueType = dictionaryTypes[0].GenericTypeArguments[1];
                 return true;
             }
 
@@ -101,6 +106,7 @@ namespace Volo.Abp.Reflection
 
             keyType = null;
             valueType = null;
+
             return false;
         }
 

framework/test/Volo.Abp.Core.Tests/Volo/Abp/Reflection/TypeHelper_Tests.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Text;
 using Shouldly;
 using Xunit;
 
@@ -16,5 +15,39 @@ namespace Volo.Abp.Reflection
 
             guidType.ShouldBe(typeof(Guid));
         }
+
+        [Fact]
+        public void IsDictionary()
+        {
+            //Dictionary<string, int>
+            TypeHelper.IsDictionary(
+                typeof(Dictionary<string, int>),
+                out var keyType,
+                out var valueType
+            ).ShouldBeTrue();
+            keyType.ShouldBe(typeof(string));
+            valueType.ShouldBe(typeof(int));
+
+            //MyDictionary
+            TypeHelper.IsDictionary(
+                typeof(MyDictionary),
+                out keyType,
+                out valueType
+            ).ShouldBeTrue();
+            keyType.ShouldBe(typeof(bool));
+            valueType.ShouldBe(typeof(TypeHelper_Tests));
+
+            //TypeHelper_Tests
+            TypeHelper.IsDictionary(
+                typeof(TypeHelper_Tests),
+                out keyType,
+                out valueType
+            ).ShouldBeFalse();
+        }
+
+        public class MyDictionary : Dictionary<bool, TypeHelper_Tests>
+        {
+
+        }
     }
 }