static CancellationTokenSource source = new CancellationTokenSource();
var task = Task.Run(() =>
{
for (var i = 0; i < 100000; i++)
{
Console.WriteLine(i);
Thread.Sleep(1000);
}
}，source.Token);

CancellationTokenSource source = new CancellationTokenSource();
            //注册一个线程取消后执行的逻辑
            source.Token.Register(() =>
            {
                //这里执行线程被取消后的业务逻辑.
                Console.WriteLine("-------------我是线程被取消后的业务逻辑---------------------");
            }); 
            var t = Task.Run(() =>
            {
                for (var i = 0; i < 100000; i++)
                {
                    if (source.IsCancellationRequested)
                    {
                        return;
                    }
                    Thread.Sleep(100);
                    Console.WriteLine("当前thread={0} 正在运行 {1}", Thread.CurrentThread.ManagedThreadId,i);
                  
                } 
            }, source.Token);
            

            Thread.Sleep(1000);
            source.Cancel(); 
            Console.Read();