public static void MsgGetC2CReceiveMessageOpt() { string user_id = "287646"; List <string> user_id_list = new List <string>(); user_id_list.Add(user_id); TIMResult res = TencentIMSDK.MsgGetC2CReceiveMessageOpt(user_id_list, addAsyncDataToConsole); Utils.Log(((int)res).ToString()); addDataToConsole(res); }