泛型委托 Func<in T, out TResult>

 

http://www.cnblogs.com/jackson0714/p/5125808.html

 

 

 

 

 1 class Program
 2 {
 3 //http://www.cnblogs.com/jackson0714/p/5125808.html
 4 static void Main(string[] args)
 5 {
 6 Func<int, int> addDelegate = Add;
 7 Console.WriteLine("Starting Main function ---------------");
 8 Thread.CurrentThread.Name = "Main Thread";
 9 string message = "I'm here!";
10 addDelegate.BeginInvoke(2, AddCallback, message);
11 for (int i = 1; i < 4; i++)
12 {
13 Thread.Sleep(TimeSpan.FromSeconds(1));
14 Console.WriteLine(" {0} started {1} second(s)", Thread.CurrentThread.Name, i);
15 }
16 Console.WriteLine("Read key ----------------------------");
17 Console.ReadKey();
18 }
19 private static void AddCallback(IAsyncResult ar)
20 {
21 string message = (string)ar.AsyncState;//输入状态
22 AsyncResult result = (AsyncResult)ar;//结果
23 Func<int, int> myDelegate = (Func<int, int>)result.AsyncDelegate; //异步调用的委托对象(addDelegate)
24 int sum = myDelegate.EndInvoke(ar); //结果返回 (从异步调用的委托对象中获取返回值)
25 Console.WriteLine("Add方法执行的结果：{0}",sum);
26 }
27 private static int Add(int num)
28 {
29 //判断当前线程是不是线程池线程
30 if (Thread.CurrentThread.IsThreadPoolThread)
31 { 
32 //设置当前线程的名字为为 Pool Thread
33 Thread.CurrentThread.Name = "Pool Thread";
34 }
35 Console.WriteLine(" Starting Add function ---------------");
36 int sum = 0;
37 for (int i = 1; i < num + 1; i++)
38 {
39 sum += i;
40 Thread.Sleep(TimeSpan.FromSeconds(1));
41 Console.WriteLine(" {0} started {1} second(s)", Thread.CurrentThread.Name, i);
42 }
43 Console.WriteLine(" End Add function -------");
44 return sum;
45 }
46 }

 

posted @ 2018-03-21 09:33  evanfan  阅读(45)  评论(0)    收藏  举报