c#异步Begininvoke使用随笔

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace WindowsFormsApplication1
 8 {
 9     public class delegateclass
10     {
11         private delegate int Dothread();
12         static Dothread dothread = new Dothread(work);
13 
14         public static void start()
15         {
16             AsyncCallback backCall = new AsyncCallback(backcall);

18             dothread.BeginInvoke(backCall, "我是异步调用的parameter");//第一个参数是调用work方法的参数，第二个是回调函数，第三个是需要传到回调函数里的参数可以是Object类型
19         }
20         /// <summary>
21         ///这个是委托调用程序
22         /// </summary>
23         private static int work()
24         {
25             System.Windows.Forms.MessageBox.Show("我是委托调用程序");
26             return 999;
27             
28         }
29         /// <summary>
30         /// 回调函数
31         /// </summary>
32         /// <param name="parameter"></param>
33         /// <returns></returns>
34         private static int backcall(int parameter)
35         {
36             System.Windows.Forms.MessageBox.Show("这是一个回调函数");
37             return 0;
38         
39         }
40         private static void backcall(IAsyncResult parameter)
41         {
42             int result=dothread.EndInvoke(parameter);
43             System.Windows.Forms.MessageBox.Show("这是一个回调函数");
44             System.Windows.Forms.MessageBox.Show(result.ToString());
45             System.Windows.Forms.MessageBox.Show(parameter.AsyncState.ToString());
46 
47 
48         }
49     }
50 
51 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 using System.Windows.Forms;
10 
11 namespace WindowsFormsApplication1
12 {
13     public partial class Form1 : Form
14     {
15         public Form1()
16         {
17             InitializeComponent();
18         }
19 
20         private void button1_Click(object sender, EventArgs e)
21         {
22             delegateclass.start();
23         }
24     }
25 }