C# 中提供多线程同步退出机制，详参对象: CancellationTokenSource
CancellationTokenSource 中暂未提供复位操作，因此当调用Cancle 之后，若再次调用，需重新初使化对象。
代码示例:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks; namespace CancellationTokenSourceTest
{
class Program
{ static void Main(string[] args)
{
//一种多线程取消任务开关对象
CancellationTokenSource s1 = new CancellationTokenSource();
CancellationTokenSource s2 = new CancellationTokenSource(); //s1 , 或者 s2 取消，导致 s3 取消
CancellationTokenSource s3 = CancellationTokenSource.CreateLinkedTokenSource(s1.Token, s2.Token); //异步执行结束 回调
s1.Token.Register(new Action(() => {
Console.WriteLine("线程{0} 执行回调!", System.Threading.Thread.CurrentThread.ManagedThreadId);
})); s2.Token.Register(new Action(() =>
{
Console.WriteLine("线程{0} 执行回调!", System.Threading.Thread.CurrentThread.ManagedThreadId);
})); s3.Token.Register(new Action(() =>
{
Console.WriteLine("线程{0} 执行回调!", System.Threading.Thread.CurrentThread.ManagedThreadId);
})); //异步执行
ThreadPool.QueueUserWorkItem(new WaitCallback(Print), s1.Token); //Token 中包含回调信息，执行结束 触发 Register 关联方法。
// System.Threading.Thread.Sleep(2000);
ThreadPool.QueueUserWorkItem(new WaitCallback(Print), s2.Token);
// System.Threading.Thread.Sleep(2000);
ThreadPool.QueueUserWorkItem(new WaitCallback(Print), s3.Token); Console.WriteLine();
s2.CancelAfter(3000); //若各线程传递各自tocken ,执行回调线程： s2 , s3
//s1.CancelAfter(3000); //若各线程传递各自tocken ,执行回调线程: s1 , s3 //s3.Cancel(); //若各线程传递各自tocken ,只触发 s3 , 不会触发 s1 , s2 回调。 //注意: 若各线程传递s3.token , s1 , s2 任意Cancle , s1 , s2 , s3 均会回调。 Console.ReadKey(); } static void Print(object objToken) {
CancellationToken token = (CancellationToken)objToken;
Console.WriteLine("Print , 开始等待{0}...", System.Threading.Thread.CurrentThread.ManagedThreadId);
if (token.WaitHandle.WaitOne()) {
Console.WriteLine( "直到 调用 Cancel() 执行此处 ");
} //while (!token.IsCancellationRequested) {
// //调用Cancel() 后 退出循环
//} Console.WriteLine("执行退出 {0}!" , System.Threading.Thread.CurrentThread.ManagedThreadId);
} }
}