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I'm trying to create an open instance delegate for a generic interface method, but I keep receiving a NotSupportedException. Here is the simplified code that won't run: interface IFoo { void Bar<T>(T j); } class Foo : IFoo { public void Bar<T>(T j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar").MakeGenericMethod(typeof(int)); var x = Delegate.CreateDelegate(typeof(Action<IFoo, int>), null, bar); } The last line throws NotSupportedException, "Specified method is not supported". By comparison, a non-generic open instance delegate runs fine: interface IFoo { void Bar(int j); } class Foo : IFoo { public void Bar(int j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar"); var x = Delegate.CreateDelegate(typeof(Action<IFoo, int>), null, bar); } And a closed generic delegate also works: interface IFoo { void Bar<T>(T j); } class Foo : IFoo { public void Bar<T>(T j) { } } static void Main(string[] args) { var bar = typeof(IFoo).GetMethod("Bar").MakeGenericMethod(typeof(int)); var x = Delegate.CreateDelegate(typeof(Action<int>), new Foo(), bar); } So the recipe for closed generic delegates and open instance delegates work separately, but not when combined. It's starting to look like either a runtime bug, or intentional omission. Anyone have any insight here?

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