發送多個消息時，WCF回調超時

Question

我有一個wcf回調程序，它可以向客戶端發送消息。

如果我嘗試發送第二條消息，則整個程序都會凍結，並且我收到timeoutexception。

這是服務器代碼：

 public void SendMessageToClient(string computerName, string message)
    {
        foreach (var session in connectedClients.Values)
        {
            if (session.ComputerName == computerName)
            {
                var asyncResult = session.Callback.BeginOnMessageReceived(message, new AsyncCallback(OnPushMessageComplete), session.Callback);
                if (asyncResult.CompletedSynchronously)
                    CompletePushMessage(asyncResult);
            }
        }
    }
   void OnPushMessageComplete(IAsyncResult asyncResult)
    {
        CompletePushMessage(asyncResult);            
    }

    void CompletePushMessage(IAsyncResult asyncResult)
    {
        var callbackChannel = (IServiceCallback)asyncResult.AsyncState;
        try
        {
            callbackChannel.EndOnMessageReceived(asyncResult);
        }
        catch { }
    }

這是Callback接口：

 [OperationContract(IsOneWay = true, AsyncPattern = true)]
    IAsyncResult BeginOnMessageReceived(string message, AsyncCallback acb, object state);
    void EndOnMessageReceived(IAsyncResult iar);

這是客戶端代碼：

[CallbackBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant, UseSynchronizationContext = false)]
public class ServiceHandler : IServiceCallback
{
    public delegate void MessageReceivedHandler(string message);
    public event MessageReceivedHandler OnMessageReceivedEvent;

    public void OnMessageReceived(string message)
    {
        if (this.OnMessageReceivedEvent != null)
            this.OnMessageReceivedEvent(message);
    }
}    

void callback_OnMessageReceivedEvent(string message)
    {
       setlb_info(message)
    }
public void setlb_info(string wert)
    {
        if (this.lb_info.InvokeRequired)
        {
            setlb_infoCallback d = new setlb_infoCallback(setlb_info);
            this.Invoke(d, new object[] { wert });
        }
        else
        {
            this.lb_info.Text = wert;
        }

    }

如果我嘗試這樣做：

Service.CurrentInstance.SendMessageToClient(client_name, message);

客戶端會收到消息，但是如果我第二次調用相同的方法，則會收到timeoutexception（設置為1分鍾）。

我正在使用此項目（德語）中的代碼：

http://www.flexbit.at/blog/wcf-duplex-zwischen-windows-sevice-und-gui-frontend/

我希望有人可以幫助我，因為如果此功能無法正常工作，我將無法完成工作。

最好的祝福

編輯：我忘記了客戶端上的代碼：

 var callback = new ServiceHandler();
                callback.OnMessageReceivedEvent += new ServiceHandler.MessageReceivedHandler(callback_OnMessageReceivedEvent);
                var callbackInstanceContext = new InstanceContext(callback);
                client = new ServiceClient(callbackInstanceContext);
                client.Subscribe(System.Environment.MachineName);    

Answer 1

嘗試改變[CallbackBehavior（ConcurrencyMode = ConcurrencyMode。 折返 ，UseSynchronizationContext =假）]至[CallbackBehavior（ConcurrencyMode = ConcurrencyMode。 海報 ，UseSynchronizationContext =假）]