備注學院

現在用一個用線程控制的進程條來說明，大致的步驟如下：

1．創建Invoke函數，大致如下：  
/// <summary>  
/// Delegate function be invoked by main thread  
/// </summary>  
private      void      InvokeFun()  
{  
     if(prgBar.Value< 100)  
     prgBar.Value = prgBar.Value + 1;  
}  

2．子線程入口函數：  
/// <summary>  
/// Thread function interface  
/// </summary>  
private void ThreadFun()  
{  
     // Create invoke method by specific function
     MethodInvoker mi = new MethodInvoker(this.InvokeFun);  

     for(int i=0; i<100; i++)  
     {  
       this.BeginInvoke(mi);    
       Thread.Sleep(100);  
     }  
}

3.創建子線程：  
Thread thdProcess = new Thread(new ThreadStart(ThreadFun));  
thdProcess.Start();  

方法二：
加入該句：Control.CheckForIllegalCrossThreadCalls = False     取消線線程安全保護模式！

方法三：帶參數
使用類、類的方法或類的屬性都可以向線程傳遞參數：
public class UrlDownloader
{
     string url;
  
     public UrlDownloader (string url)
     {
       this.url = url;
     }
  
     public void Download()
     {
       WebClient wc = new WebClient();
       Console.WriteLine("Downloading " + url);                        
       byte[] buffer = wc.DownloadData (url);
       string download = Encoding.ASCII.GetString(buffer);
       Console.WriteLine(download);
       Console.WriteLine("Download successful.");
    
       //這里你可以將download進行保存等處理......
     }
}

[... 在另一個類中使用它們...]
              
UrlDownloader downloader = new UrlDownloader (yourUrl);
new Thread (new ThreadStart (downloader.Download)).Start();

注意參數是如何傳遞的。

方法四：帶參數
ThreadStart starter = delegate { Download(yourUrl); };
new Thread(starter).Start();

//使用線程池
WaitCallback callback = delegate (object state) { Download ((string)state); };
ThreadPool.QueueUserWorkItem (callback, yourUrl);

方法五：帶參數
Thread t = new Thread (new ParameterizedThreadStart(DownloadUrl));
t.Start (myUrl);
static void DownloadUrl(object url)
{
  // ....
}