的foreach冷凍形式

Question

我知道有很多關於凍結的foreach形式的東西，但我不能找到一個解決我的問題。我已經有這個程序的服務器部分的工作，我試圖讓一個客戶端，雖然連接到服務器這一代碼將預製txtConn.AppendText("Attempting connection.");

這是我對套接字連接

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; 
    } 

代碼

My program looks like this

當我運行該程序，並與連說了錯誤的端口，它會檢查我的電腦上所有可能的IPS和等待，直到後foreach語句，以顯示錯誤或任何東西。我怎樣才能讓它積極展示這一點？ This is when it runs

Answer 1

您需要在不同的線程運行你的代碼，使用戶界面仍然可以更新，而它正在執行。

做到這一點，最簡單的方法是通過將連接環在線程池一個新的任務。

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

如果您需要other options你也可以使用一個任務，BackgroundWorker的，等

Answer 2

使用應該使用Socket類Async方法或在另一個線程運行這個東西。您也可以使用BackgroundWorker來做到這一點。

Answer 3

我剛纔已經回答了類似的問題here，但在其上展開您的特定情況下，它看起來像你實際上並沒有使用backgroundWorker1。 foreach應該在backgroundWorker1.DoWork事件引用的方法中完成。您還需要爲backgroundWorker1.ProgressChanged事件創建一個方法。您可以使用ReportProgress傳遞一個字符串，然後該消息追加到文本框：

從Worker_DoWork方法的foreach循環，你會報告，而不是直接更新RichTextBox的進展：

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

然後在Worker_ProgressChanged方法中，您將使用如下所示更新RichTextBox：

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