diff --git a/ILRuntime/Runtime/Intepreter/DelegateAdapter.cs b/ILRuntime/Runtime/Intepreter/DelegateAdapter.cs
index 5764ef3e..14c45a64 100644
--- a/ILRuntime/Runtime/Intepreter/DelegateAdapter.cs
+++ b/ILRuntime/Runtime/Intepreter/DelegateAdapter.cs
@@ -1110,7 +1110,7 @@ public override bool CanAssignTo(IType type)
                 }
                 if (im.IsDelegateInvoke)
                 {
-                    if (im.ParameterCount == method_count && ret_type == method.ReturnType)
+                    if (im.ParameterCount == method_count && method.ReturnType.CanAssignTo(ret_type))
                     {
 
                         for (int i = 0; i < im.ParameterCount; i++)
diff --git a/ILRuntime/Runtime/Intepreter/ILIntepreter.cs b/ILRuntime/Runtime/Intepreter/ILIntepreter.cs
index 3ac3daf8..1061f8f9 100644
--- a/ILRuntime/Runtime/Intepreter/ILIntepreter.cs
+++ b/ILRuntime/Runtime/Intepreter/ILIntepreter.cs
@@ -3628,7 +3628,14 @@ public object Run(ILMethod method, object instance, object[] p)
                                                     }
                                                     else
                                                     {
-                                                        throw new InvalidCastException(string.Format("Cannot Cast {0} to {1}", ((ILTypeInstance)obj).Type.FullName, type.FullName));
+                                                        string curType;
+                                                        if (type.IsDelegate)
+                                                        {
+                                                            curType = $"{((DelegateAdapter)obj).Method.DeclearingType.FullName}.{((DelegateAdapter)obj).Method.Name}";
+                                                        }
+                                                        else
+                                                            curType = ((ILTypeInstance)obj).Type.FullName;
+                                                        throw new InvalidCastException(string.Format("Cannot Cast {0} to {1}", curType, type.FullName));
                                                     }
                                                 }
                                                 else