在C#中满足条件后执行任务 [英] Executing task after condition is met in c#

问题描述

假设我们有:

bool condition = false;

现在我要开始一个新任务:

Now I want to start a new task:

new Task(() => 
{
    Do something as soon as condition == true;

}).Start();

一段时间后，另一个线程/任务会将条件更改为true

The condition will be changed to true by another Thread/Task after sometime

我该怎么办?

我有一个程序可以将一个文件夹备份到另一个文件夹.我可以设置多个文件夹(例如A-> B，C-> D).比起启动程序，它开始复制文件.

I have a program for backuping one folder, to another. I can set multiple folders (for axample A -> B, C -> D). Than I start the program and it starts copying files.

但是当程序已经运行时，当我添加新文件夹(E-> F)时，我必须再次手动启动它(完成A-> B和C-> D后)，以使他执行E->

But when I add new folder (E -> F) when the program is already running, I must start it manually again (after it finishes doing A -> B and C -> D) for making him do E -> F.

我想要它，当添加一个新文件夹时，在完成当前作业后自动重新开始以创建新文件夹.

I want it, when adding a new folder, start automatically again after current job is done, to do the new one.

推荐答案

如果我正确地理解您的意思，那么您正在寻找这样的东西:

If I understand you right, you are looking for something like this:

  //TODO: do not forget to dispose m_Condition 
  ManualResetEventSlim m_Condition = new ManualResetEventSlim(false);

  public bool Condition {
    get {
      return m_Condition.IsSet;  
    }
    set {
      if (value) 
        m_Condition.Set();
      else
        m_Condition.Reset();
    }
  } 

  ...

  Task myTask = Task.Run(() => {
    m_Condition.Wait();

    //TODO: put relevant code here
  });

将Condition切换到true后，任务将立即开始:

The task will start as soon as Condition is switched into true:

  Condition = true; // this unlock myTask

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