如何修复:客户端断开连接后，tcp 服务器关闭等待 [英] How to fix: The tcp server having close waits after client disconnected

问题描述

我的 tcp 服务器被Close_Waits"挂起.我需要一个示例程序来处理来自客户端的持久连接.

I am having tcp server which gets hanged with "Close_Waits". I need to have an example program which deals with the persistent connection from the client.

我尝试捕获异常，然后关闭捕获内的套接字.但没有运气！

I have tried catching the exceptions and then closing the socket inside the catch. But no luck!

protected virtual void ReceiveCallBack(IAsyncResult result)
{
    var wrapper = (ConnectedSocketWrapper)result.AsyncState;
    try
    {

        int bytesRead = 0;

        bytesRead = wrapper.ConnectedSocket.EndReceive(result);

        LogInfo("Byte Read" + bytesRead.ToString());

        if (bytesRead > 0)
        {
            LogInfo("inside Byte Read > 0 : " + bytesRead.ToString());
            byte[] dataRead = wrapper.Buffer.Take(bytesRead).ToArray();

            wrapper.ConnectedSocket.BeginReceive(wrapper.Buffer, 0, this.configuration.BytesToReceiveInReadOperation, SocketFlags.None, this.ReceiveCallBack, wrapper);

            DataReceivedByServer dataReceived = new DataReceivedByServer(wrapper.Token, dataRead);

            EventDispatcher.RaiseEvent(dataReceived);

            if (DataReceived != null)
            {
                DataReceived(this, new DataReceivedEventArgs(dataRead, wrapper.Token));
            }

        }
        else
        {
            EventDispatcher.RaiseEvent(new ClientDisconnected(wrapper.Token, "Read 0 bytes (client disconnected gracefully)", wrapper.ConnectedSocket.RemoteEndPoint.ToString()));

            LogInfo("inside Byte Read = 0 : " + bytesRead.ToString());
            Close(wrapper.ConnectedSocket);
            Socket removeSocket;
            connectedSockets.TryRemove(wrapper.Token, out removeSocket);
        }
    }
    catch
    {
        Close(wrapper.ConnectedSocket);
        throw;
    }

}

我需要一个挂起的空闲 TCP 服务器来无缝处理请求.

I need to have a hung free TCP server which handles the requests seamlessly.

推荐答案

如果我是你，我会检查代码和/或使用这个 simplsockets，它的可读性很强.

If I were you I would inspect code and/or use this one simplsockets, it's quite readable.

还要检查这个MultiProtocolAspNetCore，是关于如何构建TCPASP.NET Core 上的服务器.

Also check this one MultiProtocolAspNetCore, it's about how to build TCP server on top ASP.NET Core.

另请阅读这篇很棒的TCP/IP .NET Socket FAQ.

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