try { //负责通信的Socket socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPAddress ip = IPAddress.Parse(txtSever.Text);//拿到本机IP地址 IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));//连接的IP地址和端口号 //获得要连接的远程服务器应用程序的IP 地址和端口号 AsyncCallback result; IAsyncResult connecResult = socketSend.BeginConnect(point, result, null); connecResult.AsyncWaitHandle.WaitOne(3000,true); //IAsyncResult unconnnectResult = socketSend.EndConnect //socketSend.Connect(point); if(connecResult.IsCompleted) { ShowMsg("Connect successed"); //开启一个新线程不停接受服务器发来的消息 Thread th = new Thread(Receive); th.IsBackground = true; th.Start(); } else { socketSend.Close(); ShowMsg("Connect fallied"); } } catch(Exception ex) { MessageBox.Show(ex.Message); }优化这段代码

这段代码的连接部分存在两个问题，一个是异步回调函数result并没有实现，另一个是连接超时机制不够灵活。

针对第一个问题，可以将异步回调函数result改为lambda表达式或者使用async/await机制，这里给出使用async/await机制的示例代码：

private async void btnConnect_Click(object sender, EventArgs e)
{
    try
    {
        //负责通信的Socket
        socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        IPAddress ip = IPAddress.Parse(txtSever.Text);//拿到本机IP地址
        IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));//连接的IP地址和端口号

        //异步连接并等待连接完成
        await socketSend.ConnectAsync(point);

        ShowMsg("Connect successed");

        //开启一个新线程不停接受服务器发来的消息
        Thread th = new Thread(Receive);
        th.IsBackground = true;
        th.Start();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

针对第二个问题，可以使用CancellationTokenSource来实现更灵活的连接超时机制，示例代码如下：

private async void btnConnect_Click(object sender, EventArgs e)
{
    try
    {
        //负责通信的Socket
        socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        IPAddress ip = IPAddress.Parse(txtSever.Text);//拿到本机IP地址
        IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));//连接的IP地址和端口号

        //使用CancellationTokenSource实现超时机制
        using (var cts = new CancellationTokenSource(TimeSpan.FromSeconds(3)))
        {
            //异步连接并等待连接完成，同时监控取消通知
            await socketSend.ConnectAsync(point).WaitAsync(cts.Token);
        }

        ShowMsg("Connect successed");

        //开启一个新线程不停接受服务器发来的消息
        Thread th = new Thread(Receive);
        th.IsBackground = true;
        th.Start();
    }
    catch (OperationCanceledException ex)
    {
        //连接超时
        socketSend.Close();
        ShowMsg("Connect timeout");
    }
    catch (Exception ex)
    {
        //其他异常
        socketSend.Close();
        MessageBox.Show(ex.Message);
    }
}