WCF超时大于配置

Question

我已经为wcf配置了以下超时：

  public static NetTcpBinding MakeTcpBinding(bool isClient)
  {
     return new NetTcpBinding(SecurityMode.None, false)
     {
        HostNameComparisonMode = HostNameComparisonMode.StrongWildcard,
        TransactionFlow = false,
        PortSharingEnabled = true,
        Security = {Transport = {ClientCredentialType = TcpClientCredentialType.None}},
        ReceiveTimeout = isClient ? TimeSpan.FromSeconds(5) : TimeSpan.FromDays(1),
        SendTimeout = isClient ? TimeSpan.FromSeconds(1) : TimeSpan.FromSeconds(5),
        OpenTimeout = TimeSpan.FromSeconds(1),
        CloseTimeout = TimeSpan.FromSeconds(5),
        MaxReceivedMessageSize = int.MaxValue,
        ListenBacklog = int.MaxValue,
        MaxBufferSize = int.MaxValue,
        MaxBufferPoolSize = 524288,
        ReaderQuotas =
        {
           MaxArrayLength = int.MaxValue,
           MaxStringContentLength = int.MaxValue,
           MaxDepth = int.MaxValue,
           MaxBytesPerRead = int.MaxValue,
           MaxNameTableCharCount = int.MaxValue
        }
     };
  }

当客户端连接到不存在的服务器时，应该将imeout设置为1秒。

然而，当实际调用open时，我看到了一个21秒的超时。

调试2013-07-31 18:12:44,712 Communication.WcfCommunicator - NotifyAllReceivers: Type: AskWhoIsAwake，SentDate: 7/31/2013 18:12:44 AM，DetectSessionId: 376 9eb7 b563-458 b-9 eb7-a90e81f82563-1 调试2013-07-31 18:13:05,746 Communication.WcfCommunicator -无法连接到net.tcp://notup/xxx.svc/motup_www-xxx com。连接尝试持续时间为00:00:00.9879988。TCP错误代码10060:连接尝试失败是因为连接方在一段时间后没有正确响应，或建立连接失败是因为连接主机未能响应42.42.42:808。-6

是什么导致了额外的20秒超时？

Answer 1

使用异步打开和设置超时解决问题。

     var ar = client.InnerChannel.BeginOpen(null, null);
     if (!ar.AsyncWaitHandle.WaitOne(client.Endpoint.Binding.OpenTimeout, true))
        throw new CommunicationException("Service is not available");
     client.InnerChannel.EndOpen(ar);