Patching VTable of a .NET enum type

gistfile1.cs

using System;

class VTablePatch
{
    enum E { V }

    static string Interceptor(object e)
    {
        return "huehue";
    }

    static unsafe void Main()
    {
        Console.WriteLine(E.V.ToString());

        IntPtr func = ((Func<string>)E.V.ToString).Method.MethodHandle.GetFunctionPointer();

        IntPtr* slot = (IntPtr*)(typeof(E).TypeHandle.Value + 0x40);
        IntPtr* end = slot + 8;
        for (; slot <= end; ++slot)
        {
            if (*slot == func)
                break;
        }

        if (slot > end)
            throw new Exception();

        *slot = ((Func<object, string>)Interceptor).Method.MethodHandle.GetFunctionPointer();

        Console.WriteLine(((object)E.V).ToString());
        Console.WriteLine(E.V.ToString());
    }
}