C# · 12月 23, 2021

如何在C#中进行非阻塞套接字调用以确定连接状态?

Socket上Connected属性的MSDN文档说明如下:

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.@H_419_14@

我需要确定连接的当前状态 – 如何进行非阻塞,零字节发送调用?@H_419_14@解决方法 Socket.Connected属性(至少.NET 3.5版本)的MSDN文档底部的示例显示了如何执行此操作: // .Connect throws an exception if unsuccessfulclient.Connect(anEndPoint);// This is how you can determine whether a socket is still connected.bool blockingState = client.Blocking;try{ byte [] tmp = new byte[1]; client.Blocking = false; client.Send(tmp,0); Console.WriteLine(“Connected!”);}catch (SocketException e) { // 10035 == WSAEWOULDBLOCK if (e.NativeErrorCode.Equals(10035)) Console.WriteLine(“Still Connected,but the Send would block”); else { Console.WriteLine(“Disconnected: error code {0}!”,e.NativeErrorCode); }}finally{ client.Blocking = blockingState;} Console.WriteLine(“Connected: {0}”,client.Connected);