.net 带有回调的 Web 服务调用

Question

有谁知道如何向 Web 服务发送各种“回调”参数，以便在完成某个操作时，Web 服务可以调用回调，而无需从该操作返回值。

例如进度百分比，或者更类似于我的问题：

• 你有 3 种水果（苹果、橙子和柠檬）
• 您询问所有水果（3 种水果）的信息

我希望 Web 服务在知道每个水果的答案后立即返回每个值，而且保持在同一个动作调用中，所以我没有记录大量不同调用的问题（在实际上，有超过 3 种水果），因为客户端与日志记录的某些方面进行交互，这可能会非常令人困惑

 static void ClientFunction()
    {
        WebServiceFunction(Letters.All);
    }
    static bool WebServiceFunction(Letters whatLetters)
    {

        bool checkA = whatLetters == Letters.A, checkB = whatLetters == Letters.B, checkC = whatLetters = Letters.C,
            checkAll = whatLetters == Letters.All;

        //async wrapped
        if(checkA || checkAll)
        {
            // do something A
            // and send the answer to the client as soon as it is known
        }

        //async wrapped
        if (checkB || checkAll)
        {
            // do something B
            // and send the answer to the client as soon as it is known
        }

        //async wrapped
        if (checkC || checkAll)
        {
            // find out something about c
            // and send the answer to the client as soon as it is known
        }



        // lets say this is a generic return value ( for whatever the service does)
        return true;

    }

    enum Letters
    {
        A,
        B,
        C,
        All
    }

谢谢

Answer 1

查看 WCF 双工的东西

https://msdn.microsoft.com/en-us/library/ms731064(v=vs.110).aspx