协作式取消 CancellationTokenSource

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Threading;

namespace TaskApp

{

class Program

{

static void Main(string[] args)

{

//CancellationTokenSource:IDispose

using (CancellationTokenSource cts = new CancellationTokenSource())

{

 

ThreadPool.QueueUserWorkItem(o => Caculate(cts.Token, 60));

 

Console.ReadKey();

//lanch cancel method

cts.Cancel();

 

Console.ReadKey();

}

}

 

/// <summary>

/// Caculate

/// </summary>

/// <param name="ct">CancellationToken</param>

/// <param name="maxNumber"></param>

private static void Caculate(CancellationToken ct,int maxNumber)

{

int sum = 0;

for (int i = 0; i < maxNumber; i++)

{

if (!ct.IsCancellationRequested)

{

Thread.Sleep(1000);

sum += i;

}

else

{

Console.WriteLine("Caculate is cancelled:sum={0}", sum);

 

return;

}

 

}

Console.WriteLine("Caculate Finished:{0}!",sum);

}

}

}

 

 

CancellationToken 中肯定存在一种传入方法后能实时刷新的机制，CancellationTokenSource 的实例调用 Cancel方法后 ，Caculate 方法能感知到这种变化。