LanguageUtils.cs

public static class LanguageUtils
{
    public static TInterface ExplicitImplementation<TBase, TInterface>(TBase @this)
        where TBase : TInterface
        where TInterface : class
    {
        return (TInterface)new ExplicitImplementationProxy(typeof(TBase), @this).GetTransparentProxy();
    }

    private sealed class ExplicitImplementationProxy : RealProxy, IRemotingTypeInfo
    {
        private readonly Type baseType;
        private readonly object instance;

        public ExplicitImplementationProxy(Type baseType, object instance) : base(typeof(MarshalByRefObject))
        {
            this.baseType = baseType;
            this.instance = instance;
        }

        public bool CanCastTo(Type fromType, object o)
        {
            return fromType.IsInterface && fromType.IsAssignableFrom(baseType);
        }

        public string TypeName { get; set; }

        public override IMessage Invoke(IMessage msg)
        {
            var methodCall = msg as IMethodCallMessage;
            if (methodCall == null) throw new NotSupportedException();

            var map = baseType.GetInterfaceMap(methodCall.MethodBase.DeclaringType);
            var args = new object[methodCall.Args.Length];
            Array.Copy(methodCall.Args, args, args.Length);
            return new ReturnMessage(map.TargetMethods[Array.IndexOf(map.InterfaceMethods, (MethodInfo)methodCall.MethodBase)].Invoke(instance, args), args, args.Length, methodCall.LogicalCallContext, methodCall);
        }
    }
}