当进程被杀死时，WCF tcp 连接保持打开状态 [英] WCF tcp connections stay open when process is killed

问题描述

我在这里看到过类似的问题，但找不到答案.我有一个应用程序，它使用 WCF 打开到远程地址的连接，有时当我从任务管理器终止应用程序或应用程序不正常关闭时，连接保持打开状态，然后当我重新启动我的应用程序时，我收到一个异常，告诉我已经存在此端口上的侦听器.

I've seen similar questions here but couldn't find an answer. i have an app that uses WCF to open a connection to remote address, sometimes when i kill the app from the task manager or the app closes ungracefully the connection stays open and then when i restart my app i get an exception telling me there is already a listener on this port.

几个问题:

1. 为什么在我终止进程后这些连接保持打开状态?
2. 当进程异常关闭时，我如何关闭此连接?
3. 如何在尝试创建新连接之前关闭连接?

服务端:

var url = Config.GetRemoteServerUrl();
var binding = new NetTcpBinding();

binding.Security.Mode = SecurityMode.None;
binding.ReliableSession.Enabled = Config.RelaiableSession;
binding.ReliableSession.InactivityTimeout = TimeSpan.MaxValue;
binding.MaxConnections = Config.MaxConcurrentSessions;
binding.ReaderQuotas.MaxArrayLength = Config.ReaderQuotasMaxArrayLength;
binding.MaxReceivedMessageSize = Config.MaxReceivedMessageSize;
binding.SendTimeout = new TimeSpan(0,0, 0, 0,Config.SendTimeout);
binding.OpenTimeout = new TimeSpan(0,0, 0, 0,Config.OpenTimeout);

host = new ServiceHost(ServerFacade.Instance, new Uri[] { new Uri(url) });

host.AddServiceEndpoint(typeof(ITSOServiceContract), binding, url);

host.Open();

serverFacade = host.SingletonInstance as IServerFacade;

推荐答案

您可以尝试添加 Channel_Closed 事件处理程序并使用 Abort() 方法来强制处理它.

You can try to add Channel_Closed event handler and use Abort() method to force it to dispose.

    OperationContext.Current.Channel.Closed += channelClosed;


    void Channel_Closed(object sender, EventArgs e)
    {
        var success = false;
        try
        {           
           proxy.Close();
           success = true;
        }
        finally
        {
          if (!success) proxy.Abort();           
        }
    }

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