实现双工时 WCF 中的超时异常 [英] TimeOut exception in WCF while implementing duplex

问题描述

我的服务合同和回调合同如下所示:

My service contract and callback contracts look like this:

[ServiceContract(CallbackContract = typeof(IWebshopCallback))]
interface IWebshop
{
    [OperationContract]
    string GetWebshopName ();
    [OperationContract]
    string GetProductInfo (Item i);
    [OperationContract]
    List<Item> GetProductList ();
    [OperationContract]
    bool BuyProduct (string i);
    [OperationContract]
    void ConnectNewClient ();
}

[ServiceContract]
interface IWebshopCallback
{
    [OperationContract]
    void NewClientConnected (int totalNrOfConnectedClients);
}

我的服务:

[ServiceBehavior (InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Reentrant)]
class WebshopService : IWebshop
{
  ...
}

在服务内部，我有一个方法可以调用客户端的另一个方法:

Inside of the service I have a method which calls the other method on a client's side:

public void ConnectNewClient ()
    {
        totalNumber++;
        OperationContext.Current.GetCallbackChannel<IWebshopCallback> ().NewClientConnected (totalNumber);
    }

在客户端，我有一个派生自 IWebshopCallback 的表单，并有一个方法 NewClientConnected(int a).

And on the client's side I have a form which derives from IWebshopCallback and has a method NewClientConnected(int a).

问题是当我尝试运行我的代码时遇到了这个异常:

The problem is that when I try to run my code I run into this exception:

这个发送到 http://localhost:4000/IWebshopContract 的请求操作在配置超时 (00:00:59.9989895).分配给此操作的时间可能是较长超时的一部分.

This request operation sent to http://localhost:4000/IWebshopContract did not receive a reply within the configured timeout (00:00:59.9989895). The time allotted to this operation may have been a portion of a longer timeout.

不过，更奇怪的是，如果我继续运行我的应用程序，我会发现此功能有效.

What's more strange, though, is that if I continue the work of my app I see that this function worked.

是什么导致了这一切?

推荐答案

在服务器端，当你调用一个函数时你需要使用 Task.Run()，所以你应该像这样:

On the server side when you call on a function you need to use Task.Run(), so you should have it like this:

var callback = OperationContext.Current.GetCallbackChannel<IWebshopCallback> ();
Task.Run (() => callback.NewClientConnected(totalNumber));

而不是这样:

OperationContext.Current.GetCallbackChannel<IWebshopCallback> ().NewClientConnected ();

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