Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
749 views
in Technique[技术] by (71.8m points)

c# - Listening for an Ethernet Cable Unplugging Event for a TCP Server Application

I have a C# TCP server application. I detect disconnections of TCP clients when they disconnect from server but how can I detect a cable unplug event? When I unplug the ethernet cable I can't detect the disconnection.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You might want to apply "pinging" functionality, that will fail if there is TCP connection lose. Use this code to add extension method to Socket:

using System.Net.Sockets;

namespace Server.Sockets {
    public static class SocketExtensions {
        public static bool IsConnected(this Socket socket) {
            try {
                return !(socket.Poll(1, SelectMode.SelectRead) && socket.Available == 0);
            } catch(SocketException) {
                return false;
            }
        }
    }
}

Method will return false if there is no connection available. It should work to check if there is or no connection even if you had no SocketExceptions on Reveice / Send methods. Bear in mind that if you had exception that had error message that is related to connection lose, then you don't need check for connection anymore.
This method is meant to be used when socket is looks like connected but might be not like in your case.

Usage:

if (!socket.IsConnected()) {
    /* socket is disconnected */
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...