Foreach冷冻形式

本文关键字:冷冻 Foreach | 更新日期: 2023-09-27 18:28:30

我知道foreach冻结表单有很多问题,但我找不到解决问题的方法。我已经让这个程序的服务器部分工作了,我正在尝试让客户端在连接到服务器时执行txtConn.AppendText("Attempting connection.");

这是我的插座连接的代码

private static Socket ConnectSocket(string server, int port, RichTextBox txtConn, BackgroundWorker backgroundWorker1)
    {
        Socket s = null;
        IPHostEntry hostEntry = null;
        // Get host related information.
        hostEntry = Dns.GetHostEntry(server);
        // Loop through the AddressList to obtain the supported AddressFamily. This is to avoid
        // an exception that occurs when the host IP Address is not compatible with the address family
        // (typical in the IPv6 case).
        backgroundWorker1.RunWorkerAsync();
        foreach (IPAddress address in hostEntry.AddressList)
        {
            IPEndPoint ipe = new IPEndPoint(address, port);
            Socket tempSocket =
                new Socket(address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
            Console.WriteLine(ipe);
            try
            {
                attempt++;
                txtConn.Select(txtConn.TextLength, 0);
                txtConn.SelectionColor = Color.Aqua;
                if (attempt == 1)
                {
                    txtConn.AppendText("Attempting connection.");
                }
                else if (attempt > 1)
                {
                    txtConn.AppendText("'r" + "Attempting connection.");
                }
                txtConn.SelectionColor = txtConn.ForeColor;
                tempSocket.Connect(ipe);
            }
            catch (ArgumentNullException ane)
            {
                Console.WriteLine("ArgumentNullException : {0}", ane.ToString());
                txtConn.Select(txtConn.TextLength, 0);
                txtConn.SelectionColor = Color.Red;
                txtConn.AppendText("'r'n" + "Connection could not be established.");
                txtConn.SelectionColor = txtConn.ForeColor;
            }
            catch (SocketException se)
            {
                Console.WriteLine("SocketException : {0}", se.ToString());
                txtConn.Select(txtConn.TextLength, 0);
                txtConn.SelectionColor = Color.Red;
                txtConn.AppendText("'r'n" + "Connection could not be established.");
                txtConn.SelectionColor = txtConn.ForeColor;
            }
            catch (Exception e)
            {
                Console.WriteLine("Unexpected exception : {0}", e.ToString());
                txtConn.Select(txtConn.TextLength, 0);
                txtConn.SelectionColor = Color.Red;
                txtConn.AppendText("'r'n" + "Connection could not be established.");
                txtConn.SelectionColor = txtConn.ForeColor;
            }
            if (tempSocket.Connected)
            {
                Console.WriteLine("Connected");
                s = tempSocket;
                break;
            }
            else
            {
                continue;
            }
        }
        return s;
    }

我的程序看起来像这个

当我运行程序并连接到错误的端口时,它会检查我计算机上所有可能的ip,并等待foreach语句之后显示错误或任何内容。如何使其主动显示此信息?这是当它运行时

Foreach冷冻形式

您需要在不同的线程中运行代码,以便UI在执行时仍然可以更新。

最简单的方法是将连接循环添加到ThreadPool中的新任务中。

ThreadPool.QueueUserWorkItem(i => {
    // Connection loop goes here.
});

如果您需要其他选项,您也可以使用Task、BackgroundWorker等。

我刚刚回答了一个类似的问题,但为了针对您的特定情况进行扩展,看起来您实际上并没有使用backgroundWorker1。foreach应该在backgroundWorker1.DoWork事件引用的方法中完成。您还需要为backgroundWorker1.ProgressChanged事件创建一个方法。您可以使用ReportProgress传递一个字符串,然后将该消息附加到您的文本框中:

在Worker_DoWork方法中的foreach循环中,您将报告进度,而不是直接更新RichTextBox:

worker.ReportProgress(0, "Connection could not be established.");

然后在Worker_ProgressChanged方法中,您将使用类似的东西来更新RichTextBox:

txtConn.AppendText(e.UserState.ToString());

Use应该使用Socket类中的Async方法,或者在另一个线程中运行这些东西。您也可以使用BackgroundWorker来执行此操作。