多次异步调用 WCF 期间出现异常（无法处理消息...）

Question

我收到来自 WCF 客户端的“消息无法处理...”错误。请帮忙，这快要死我了。

我有一个测试获胜应用程序，它通过 for 循环来启动 x 次异步调用。每个异步调用都会实例化其自己的 WCF 代理实例，并使用该代理调用 WCF 服务。如果 x 约为 35 或更小，则一切正常。如果x> 40 左右，许多调用都很好地完成，但少数返回此：

System.ServiceModel.Security.MessageSecurityException: 
  An unsecured or incorrectly secured fault was received from the other party. 
  See the inner FaultException for the fault code and detail. ---> 
  System.ServiceModel.FaultException: The message could not be processed. 
  This is most likely because the action 'http://tempuri.org/IMyService/MakeRequest' 
  is incorrect or because the message contains an invalid or expired 
  security context token or because there is a mismatch between bindings. 
  The security context token would be invalid if the service aborted 
  the channel due to inactivity. To prevent the service from aborting 
  idle sessions prematurely increase the Receive timeout on the 
  service endpoint's binding.
  --- End of inner exception stack trace ---

Server stack trace: 
   at System.ServiceModel.Security.SecuritySessionClientSettings`1.SecurityRequestSessionChannel.ProcessReply(Message reply, TimeSpan timeout, SecurityProtocolCorrelationState correlationState)
   at System.ServiceModel.Security.SecuritySessionClientSettings`1.SecurityRequestSessionChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at ...

我正在使用客户端和服务器端证书，并具有消息安全性。我不明白为什么它只运行一定次数，然后就呕吐了。它似乎还会在接近迭代结束时的调用上引发错误。另外，这个错误早在我的任何超时达到之前就发生了，这些超时在客户端和服务器端设置相同：

<binding name="WSHttpBinding_IMyService" 
         closeTimeout="00:10:00" openTimeout="00:10:00" 
         receiveTimeout="00:10:00" sendTimeout="00:10:00"... />

此外，我正在使用服务限制：

<serviceThrottling 
       maxConcurrentCalls="100" 
       maxConcurrentSessions="100" />

有什么想法吗？

谢谢，马克。

Answer 1

当您达到调用次数的特定限制并且每个调用都会创建自己的代理时，您会收到错误消息。

因此，该错误可能与代理的创建或关闭和清理有关。

您尚未发布代码，但您也许可以通过遵循以下最佳实践来解决问题并提高代码的性能： http://blogs.msdn.com/wenlong/archive/2007/10 /27/performance-improvement-of-wcf-client-proxy-creation-and-best-practices.aspx

异步 wcf 调用的另一个典型问题是确保在异步调用返回之前代理不会关闭。