c#判断socket是否还连接着

最新推荐文章于 2025-08-20 00:52:51 发布

原创最新推荐文章于 2025-08-20 00:52:51 发布 · 4.3k 阅读

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根据MSDN的说明，Socket.Connected属性只能反映最后一次I/O操作时的连接状态，不能用于实时判断当前连接是否有效。为了准确检查Socket是否仍然连接，应该执行一个非阻塞的、发送零字节的Send尝试。如果该操作成功或返回WAEWOULDBLOCK错误（10035），则表示Socket仍处于连接状态；反之，则表明连接已断开。

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刚开始用的是Socket.Connected。但是，msdn上说：“

The Connected property gets the connection state of the Socket as of the last I/O operation. When it returns false, the Socket was either never connected, or is no longer connected.

The value of the Connected property reflects the state of the connection as of the most recent operation. If you need to determine the current state of the connection, make a nonblocking, zero-byte Send call. If the call returns successfully or throws a WAEWOULDBLOCK error code (10035), then the socket is still connected; otherwise, the socket is no longer connected.

”

所以不能用Socket.Connected判断。

使用方法:

private bool SocketConnected()
            {
                try
                {
                    return !_socket.Poll(1, SelectMode.SelectRead) && (_socket.Available == 0);
                }
                catch (SocketException)
                {
                    return false;
                }
                catch (ObjectDisposedException)
                {
                    return false;
                }
            }

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