3 static void Main(string[] args)
4 {
5 Func
mySum1 = SumNumbers;
6 Func mySum2 = SumNumbers;
7 Func mySum3 = SumNumbers;
9 AsyncCallback callback = c => Console.WriteLine("线程ID:{0},回调函数执行:{1}",Thread.CurrentThread.ManagedThreadId,c.AsyncState);
12 IAsyncResult result1= mySum1.BeginInvoke(10000, callback, "第一个异步");
13 IAsyncResult result2= mySum2.BeginInvoke(10000, callback, "第二个异步");
14 IAsyncResult result3= mySum3.BeginInvoke(10000, callback, "第三个异步");
17 //异步等待方式1：使用EndInvoke
18 int asyc1 = mySum1.EndInvoke(result1);
19 Console.WriteLine("第一个异步已经执行完成，结果:{0}",asyc1);
21 //异步等待方式2：使用AsyncWaitHandle.WaitOne，参数-1表示一直等待到执行完成
22 if (result2.AsyncWaitHandle.WaitOne(-1))
23 {
24 Console.WriteLine("第二个异步执行完成");
25 }
27 //异步等待方式3：使用IsCompleted判断
28 while (!result3.IsCompleted)
29 {
30 Console.WriteLine("第三个异步还在执行中....");
31 Thread.Sleep(300);
32 }
33 Console.WriteLine("第三个异步执行完成");
35 Console.ReadKey();
36 }
38 public static int SumNumbers(int count)
39 {
40 int sum = 0;
41 for (int i = 0; i < count; i++)
42 {
43 sum += i;
44 }
46 Thread.Sleep(3000);
47 return sum;
48 }
49 }
代码执行结果：
