socket断线如何重连

如题所述

当Socket.Conneted == false时，调用如下函数进行判断：

///
/// å½“socket.connected为false时，进一步确定下当前连接状态
/// 
/// 
private bool IsSocketConnected()
{
    #region remarks
    /********************************************************************************************
     * å½“Socket.Conneted为false时， å¦‚果您需要确定连接的当前状态，请进行非阻塞、零字节的 Send è°ƒç”¨ã€‚
     * å¦‚果该调用成功返回或引发 WAEWOULDBLOCK é”™è¯¯ä»£ç  (10035)，则该套接字仍然处于连接状态； 
     * å¦åˆ™ï¼Œè¯¥å¥—接字不再处于连接状态。
     * Depending on 
    ********************************************************************************************/
    #endregion
#region è¿‡ç¨‹
            // This is how you can determine whether a socket is still connected.
            bool connectState = true;
            bool blockingState = socket.Blocking;
            try
            {
                byte[] tmp = new byte[1];
socket.Blocking = false;
                socket.Send(tmp, 0, 0);
                //Console.WriteLine("Connected!");
                connectState = true; //若Send错误会跳去执行catch体，而不会执行其try体里其之后的代码
            }
            catch (SocketException e)
            {
                // 10035 == WSAEWOULDBLOCK
                if (e.NativeErrorCode.Equals(10035))
                {
                    //Console.WriteLine("Still Connected, but the Send would block");
                    connectState = true;
                }
else
                {
                    //Console.WriteLine("Disconnected: error code {0}!", e.NativeErrorCode);
                    connectState = false;
                }
            }
            finally
            {
                socket.Blocking = blockingState;
            }
//Console.WriteLine("Connected: {0}", client.Connected);
            return connectState;
            #endregion
}

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