暫停線程，而另一個線程正在執行任務

Question

我創建了一個執行任務的線程，但我需要暫停我的主線程，直到我的輔助線程結束任務。

private void AquilesPL_Load(object sender, EventArgs e) 
    { 
     ThreadStart ts = new ThreadStart(RunTask) 
     Thread t = new Thread(ts); 
     t.Start(); 
     SomeFunction1(); 
     SomeFunction2(); 
     //I need to pause the main thread here, if runtask() continue working 
     //if runt task ends, this main thread must to continue. 
     ReadFile(); 
     CloseProgram(); 
    } 
    private void RunTask() 
    { 
     //Some code that write a file 
     //RunTaskfunction ends, and i have to continue 
    } 

    private void ReadFile() 
    { 
     //Reading the file, this file has been written by RunTask 

    } 

在此先感謝。

Answer 1

但我需要暫停我的主線程，直到我的輔助線程結束任務。

這通常是一個壞主意。更好的解決方案是在任務執行時禁用UI，然後在完成時重新啓用它。

TPL和異步/等待使這相當簡單。例如：

private async void AquilesPL_Load(object sender, EventArgs e) 
{ 
    var task = Task.Run(() => RunTask()); 
    SomeFunction1(); 
    SomeFunction2(); 

    // Disable your UI controls 

    await task; // This will wait until the task completes, 
       // but do it asynchronously so it does not block the UI thread 

    // This won't read until the other task is done 
    ReadFile(); 

    // Enable your UI controls here 
} 

如果您不能使用C＃5，您可以通過.NET 4和TPL做到這一點：

private void AquilesPL_Load(object sender, EventArgs e) 
{ 
    var task = Task.Factory.StartNew(() => RunTask()); 

    SomeFunction1(); 
    SomeFunction2(); 

    // Disable your UI controls 

    task.ContinueWith(t => 
    { 
     // This won't read until the other task is done 
     ReadFile(); 

     // Enable your UI controls here 
    }, TaskScheduler.FromCurrentSynchronizationContext()); 
}