Oct 8, 2025 · Oct 9, 2025 · Oct 14, 2025 · Dec 8, 2025
diff --git a/src/runtime/Types/ClassDerived.cs b/src/runtime/Types/ClassDerived.cs
            string? baseMethodName = null;
            if (!method.IsAbstract)
            {
                baseMethodName = "_" +baseType.Name + "__" + method.Name;
                baseMethodName = "_" +method.DeclaringType.Name + "__" + method.Name;
                MethodBuilder baseMethodBuilder = typeBuilder.DefineMethod(baseMethodName,
                    MethodAttributes.Public |
                    MethodAttributes.Final |
diff --git a/src/testing/classtest.cs b/src/testing/classtest.cs
            return "!";
        }
    }

    public class SimpleClass2 : SimpleClass
    {
        // this class does not override SayGoodbye.
    }
 }
diff --git a/tests/test_subclass.py b/tests/test_subclass.py
 import System
 import pytest
 from Python.Test import (IInterfaceTest, SubClassTest, EventArgsTest,
                         FunctionsTest, IGenericInterface, GenericVirtualMethodTest, SimpleClass, ISayHello1)
                         FunctionsTest, IGenericInterface, GenericVirtualMethodTest, SimpleClass,SimpleClass2,ISayHello1)
 from System.Collections.Generic import List


    exception if a method was not implemented in the middle of the tree.
    """
    import clr
    class DualSubClass0(ISayHello1,SimpleClass):
    class DualSubClass0(ISayHello1,SimpleClass2):
        __namespace__ = "Test"
        def SayHello(self):
            return "hello"
Original file line number	Diff line number	Diff line change
Expand Up		@@ -396,7 +396,7 @@ private static void AddVirtualMethod(MethodInfo method, Type baseType, TypeBuild
		string? baseMethodName = null;
		if (!method.IsAbstract)
		{
		baseMethodName = "_" +baseType.Name + "__" + method.Name;
		baseMethodName = "_" +method.DeclaringType.Name + "__" + method.Name;
		MethodBuilder baseMethodBuilder = typeBuilder.DefineMethod(baseMethodName,
		MethodAttributes.Public \|
		MethodAttributes.Final \|
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -76,4 +76,9 @@ public virtual string SayGoodbye()
		return "!";
		}
		}

		public class SimpleClass2 : SimpleClass
		{
		// this class does not override SayGoodbye.
		}
		}
Original file line number	Diff line number	Diff line change
Expand Up		@@ -9,7 +9,7 @@
		import System
		import pytest
		from Python.Test import (IInterfaceTest, SubClassTest, EventArgsTest,
		FunctionsTest, IGenericInterface, GenericVirtualMethodTest, SimpleClass, ISayHello1)
		FunctionsTest, IGenericInterface, GenericVirtualMethodTest, SimpleClass,SimpleClass2,ISayHello1)
		from System.Collections.Generic import List


Expand DownExpand Up		@@ -355,7 +355,7 @@ def test_multi_level_subclass():
		exception if a method was not implemented in the middle of the tree.
		"""
		import clr
		class DualSubClass0(ISayHello1,SimpleClass):
		class DualSubClass0(ISayHello1,SimpleClass2):
		__namespace__ = "Test"
		def SayHello(self):
		return "hello"
Expand Down