当另一个线程正在执行任务时暂停线程

Question

我创建了一个执行任务的线程，但我需要暂停我的主线程，直到我的辅助线程结束任务。

    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

    }

提前致谢。

Answer 1

但我需要暂停我的主线程，直到我的辅助线程结束任务。

这通常是个坏主意。更好的解决方案是在任务执行时禁用 UI，然后在完成后重新启用。

TPL 和 async/await 使这变得相当简单。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
}

如果你不能使用 C# 5，你可以通过 .NET 4 和 TPL 来做到这一点：

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());
}