While Loop線程

Question

所以我一直在試圖創建一些代碼，在while循環上發送數據，特別是通過UdpClient向服務器發送數據包。

static void doSend(string ip, int port) 
    { 
     while (isSending) 
     { 
      _sockMain = new UdpClient(ip, port); 
      // Code for datagram here, took it out 
      _sockMain.Send(arr_bData, arr_bData.Length); 
     } 
    } 

但是，當我調用「停止」方法，它卡在一個常量循環，並沒有出來。我怎樣才能把while循環放入一個線程？所以我可以放棄停止線程，取消循環？

Answer 1

它掛，因爲你的doSend方法適用於UI線程。您可以使用類似下面的類，使其在一個單獨的線程上運行，也可以使用BackgroundWorkerClass

public class DataSender 
    { 
     public DataSender(string ip, int port) 
     { 
      IP = ip; 
      Port = port; 
     } 

     private string IP; 
     private int Port; 
     System.Threading.Thread sender; 
     private bool issending = false; 

     public void StartSending() 
     { 
      if (issending) 
      { 
       // it is already started sending. throw an exception or do something. 
      } 
      issending = true; 
      sender = new System.Threading.Thread(SendData); 
      sender.IsBackground = true; 
      sender.Start(); 
     } 

     public void StopSending() 
     { 
      issending = false; 
      if (sender.Join(200) == false) 
      { 
       sender.Abort(); 
      } 
      sender = null; 
     } 

     private void SendData() 
     { 
      System.Net.Sockets.UdpClient _sockMain = new System.Net.Sockets.UdpClient(IP, Port); 
      while (issending) 
      { 
       // Define and assign arr_bData somewhere in class 
       _sockMain.Send(arr_bData, arr_bData.Length); 
      } 
     } 
    } 

Answer 2

如何使用BREAK聲明？

Answer 3

static bool _isSending; 

static void doSend(string ip, int port) 
{ 
    _isSending = true; 

    while (_isSending) 
    { 
     _sockMain = new UdpClient(ip, port); 
     // ... 
     _sockMain.Send(arr_bData, arr_bData.Length); 
    } 
} 

static void Stop() 
{ 
    // set flag for exiting loop here 
    _isSending = false;  
} 

還要考慮到你的名字在PascalCase方法，即DoSend（甚至StartSending會更好），StopSending。

Answer 4

你可以使用backgroundworker線程http://www.dotnetperls.com/backgroundworker 和inside dowork（）把你的while循環。 您可以通過使用CancelAsync停止（）的代碼，並設置backgroundWorker1.WorkerSupportsCancellation == true

BackgroundWorker bw = new BackgroundWorker(); 
      if (bw.IsBusy != true) 
      { 
       bw.RunWorkerAsync(); 

      } 

      private void bw_DoWork(object sender, DoWorkEventArgs e) 
      { 
       // Run your while loop here and return result. 
       result = // your time consuming function (while loop) 
      } 

      // when you click on some cancel button 
      bw.CancelAsync();