qt（c++）：
事件中直接寫函數：

 QNetworkReply *reply = manager_->get(request);
    connect(reply, &QIODevice::readyRead,this,[&](){
        QByteArray data =  reply->readAll();
        DecodeReply(data);
    });
    connect(reply, &QNetworkReply::errorOccurred,
            this, [&](QNetworkReply::NetworkError code){
        qDebug()<<code;
    });
    connect(reply, &QNetworkReply::sslErrors,
            this, [&](const QList<QSslError> &errors){
        qDebug()<<errors;
    });

直接寫一個函數來用：

 auto func_countDate = [&](QString date)
    {
        int result = -1;
        QDate today = QDate::currentDate();

        QStringList dateList = date.split("/");
        if(dateList.size()!=3)
        {
            qDebug()<<"date error";
        }
        else
        {
            result = -today.daysTo(QDate(dateList[0].toInt(),dateList[1].toInt(),dateList[2].toInt()));
        }
        return result;
    };

c#(.NET):

void Start()
    {
        mSocketMgr = new socket_management();
        mSocketMgr.Init();
        //Debug.Log("connect to server");

        mSocketMgr.new_msg += msg =>
        {
            string result = System.Text.Encoding.UTF8.GetString(msg);
            Debug.Log("get msg : "+result);
        };
    }