如何在 C# 中检查套接字是否连接/断开连接?

本文介绍了如何在 C# 中检查套接字是否连接/断开连接?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

How can you check if a network socket (System.Net.Sockets.Socket) is still connected if the other host doesn't send you a packet when it disconnects (e.g. because it disconnected ungracefully)?

解决方案

As Paul Turner answered Socket.Connected cannot be used in this situation. You need to poll connection every time to see if connection is still active. This is code I used:

bool SocketConnected(Socket s)
{
    bool part1 = s.Poll(1000, SelectMode.SelectRead);
    bool part2 = (s.Available == 0);
    if (part1 && part2)
        return false;
    else
        return true;
}

It works like this:

s.Poll returns true if
- connection is closed, reset, terminated or pending (meaning no active connection)
- connection is active and there is data available for reading
s.Available returns number of bytes available for reading
if both are true:
- there is no data available to read so connection is not active

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如何在 C# 中检查套接字是否连接/断开连接?

问题描述

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