1、首先我们要实现如下图的效果：
a、主线程A运行方法段1时创建子线程B
b、然后子线程B执行方法段2
c、执行完后通知主线程A执行方法段3
2、实现代码如下：
public Form1() { InitializeComponent(); } public void Method1() { //给主线程取个名字 if (Thread.CurrentThread.Name == null) Thread.CurrentThread.Name = "main"; //获取主线程上下文 asyncOperation = AsyncOperationManager.CreateOperation(null); //创建一个线程并执行方法2 ThreadStart ts = new ThreadStart(Method2); Thread t = new Thread(ts); t.Name = "work"; t.Start(); } public void Method2() { MessageBox.Show("当前线程：" + Thread.CurrentThread.Name); //模拟干了一件3秒耗时的事情 Thread.Sleep(3000); //通知主线程我事情干好了，你可以执行方法3了 if (asyncOperation != null) asyncOperation.Post(new SendOrPostCallback(Method3), null); //结束上下文的生存期 asyncOperation.OperationCompleted(); } public void Method3(object data) { MessageBox.Show("当前线程：" + Thread.CurrentThread.Name); } private AsyncOperation asyncOperation; private void button1_Click(object sender, EventArgs e) { Method1(); }
3、要点记录
1、AsyncOperation 一般通过 AsyncOperationManager 对象获取
asyncOperation = AsyncOperationManager.CreateOperation(null);
2、在System.Windows.Forms.Form的UI线程存在对应的上下文AsyncOperation，在Conosol控制台程序的主线程不存在上下文AsyncOperation
给个例子一看就清楚了
static AsyncOperation asyncOperation; static void Main(string[] args) { Console.WriteLine("我是主线程：" + Thread.CurrentThread.ManagedThreadId); Method1(); Console.ReadKey(); } static void Method1() { //获取主线程上下文 asyncOperation = AsyncOperationManager.CreateOperation(null); //创建一个线程 ThreadStart ts = new ThreadStart(Method2); Thread t = new Thread(ts); t.Start(); } static void Method2() { Console.WriteLine("我是子线程：" + Thread.CurrentThread.ManagedThreadId); //模拟干了一件3秒耗时的事情 Thread.Sleep(3000); //通知主线程事情干好了，其实这里创建了一个新线程 if (asyncOperation != null) asyncOperation.Post(new SendOrPostCallback(Method3), null); //结束上下文的生存期 asyncOperation.OperationCompleted(); } static void Method3(object data) { Console.WriteLine("我是上下文创建的线程：" + Thread.CurrentThread.ManagedThreadId); }