LuaInterface.ObjectTranslator.typeOf C# (CSharp) Method

        private Type typeOf(IntPtr luaState, int idx)
        {
            int udata=LuaDLL.luanet_checkudata(luaState,1,"luaNet_class");
            if (udata == -1) {
                return null;
            } else {
                ProxyType pt = (ProxyType)objects[udata];
                return pt.UnderlyingSystemType;
            }
        }

 public static int ctype(IntPtr luaState)
 {
     ObjectTranslator translator = ObjectTranslator.FromState(luaState);
     Type t = translator.typeOf(luaState, 1);
     if (t == null)
     {
         return translator.pushError(luaState, "not a CLR class");
     }
     translator.pushObject(luaState, t, "luaNet_metatable");
     return 1;
 }