diff --git a/ILRuntime/CLR/Method/ILMethod.cs b/ILRuntime/CLR/Method/ILMethod.cs
index dbf305a1..202e82fa 100644
--- a/ILRuntime/CLR/Method/ILMethod.cs
+++ b/ILRuntime/CLR/Method/ILMethod.cs
@@ -390,7 +390,7 @@ public List<IType> Parameters
         {
             get
             {
-                if (def.HasParameters && parameters == null)
+                if (def.HasParameters || parameters == null)
                 {
                     InitParameters();
                 }
diff --git a/ILRuntime/Reflection/ILRuntimeMethodInfo.cs b/ILRuntime/Reflection/ILRuntimeMethodInfo.cs
index 48b92455..22dc2960 100644
--- a/ILRuntime/Reflection/ILRuntimeMethodInfo.cs
+++ b/ILRuntime/Reflection/ILRuntimeMethodInfo.cs
@@ -136,11 +136,22 @@ public override object[] GetCustomAttributes(Type attributeType, bool inherit)
             List<Attribute> res = new List<Attribute>();
             for (int i = 0; i < customAttributes.Length; i++)
             {
-                if (attributeTypes[i].Equals(attributeType))
+                if (attributeTypes[i].Equals(attributeType)||(inherit&&(attributeType.IsAssignableFrom(attributeTypes[i])||attributeTypes[i].BaseType!=null&&attributeType.IsAssignableFrom(attributeTypes[i].BaseType))))
                     res.Add(customAttributes[i]);
             }
             return res.ToArray();
         }
+        public Object GetCustomAttribute ( Type oType, Boolean inherit ) => this.GetCustomAttributes ( oType, inherit ).FirstOrDefault ();
+        public T GetCustomAttribute<T> ( Boolean inherit ) where T : System.Attribute => this.GetCustomAttributes<T> ( inherit ).FirstOrDefault ();
+        public T [] GetCustomAttributes<T> ( Boolean inherit ) where T : System.Attribute
+        {
+            IList<T> aDataList = new List<T> ();
+            foreach ( T attribute in this.GetCustomAttributes ( inherit ) )
+            {
+                aDataList.Add ( attribute );
+            }
+            return aDataList.ToArray ();
+        }
 
         public override MethodImplAttributes GetMethodImplementationFlags()
         {
diff --git a/ILRuntime/Runtime/Extensions.cs b/ILRuntime/Runtime/Extensions.cs
index e9d4f1c3..4cecb37c 100644
--- a/ILRuntime/Runtime/Extensions.cs
+++ b/ILRuntime/Runtime/Extensions.cs
@@ -375,7 +375,7 @@ public static bool MatchGenericParameters(this Type[] args, Type type, Type q, T
                     if (q.IsGenericType)
                     {
                         var t1 = type.GetGenericTypeDefinition();
-                        var t2 = type.GetGenericTypeDefinition();
+                        var t2 = q.GetGenericTypeDefinition();
                         if (t1 == t2)
                         {
                             var argA = type.GetGenericArguments();