任务运行时停止任务 [英] Stop Task when task run

问题描述

如何在任务运行时完全停止任务？

How can i totally stop a task when task running?

private async void button1_Click(object sender, EventArgs e)
{
  await Backup(file);
}

public async Task Backup(string File)
{
   await Task.Run(() =>
     {
       1)do something here

       2)do something here

       3)do something here

      });
}
private async void button2_Click(object sender, EventArgs e)
{
  <stop backup>
}

如果说我想在第二件事情期间停止任务， a button2然后任务将停止进程

If say i want to stop task during 2nd thing is processing, and i click a button2 then the task will stop process

如何从 button2_Click 取消或结束任务？

How do I cancel or end the task from button2_Click?

推荐答案

// Define the cancellation token source & token as global objects 
CancellationTokenSource source = new         CancellationTokenSource();
CancellationToken token = null;

//when button is clicked, call method to run task & include the cancellation token 

private async void button1_Click(object sender, EventArgs e)
{
  token = source.Token;
  await Backup(file, token);
}


public async Task Backup
(string File, CancellationToken token)
{
  Task t1 = Task.Run(()  =>
  {
    //do something here
  }, token);
} 

//cancel button click event handler 
private async void cancelButton_Click(object sender, EventArgs e)
{
  if(source! = null) 
  {
    source.Cancel() 
  } 
}

//tasks
https://msdn.microsoft.com/en-us/library/system.threading.tasks.task(v=vs.110).aspx 

//CancellationToken
https://msdn.microsoft.com/en-us/library/system.threading.cancellationtoken(v=vs.110).aspx

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