今天看到的关于邮件发送进度条的写法

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Text;
 7 using System.Windows.Forms;
 8 using System.Threading;
 9
10 namespace ThreadUpdateUI
11 {
12     public partial class Form2 : Form
13     {
14         public Form2()
15         {
16             InitializeComponent();
17         }
18
19         private void button1_Click(object sender, EventArgs e)
20         {
21             try
22             {
23                 backgroundWorker1.RunWorkerAsync(1000);
24             }
25             catch (Exception es)
26             {
27
28                 MessageBox.Show(es.Message);
29             }
30         }
31
32         private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
33         {
34             BackgroundWorker bk=sender as BackgroundWorker;//把serder转化为BackgroundWorker(后台操作)
35             int count = (int)(e.Argument);//从 DoWorkEventArgs 参数的 Argument 属性中提取该操作所需的所有参数.并保存起来.
36             e.Result = longtime(count, bk, e);//将计算的结果赋给 DoWorkEventArgs 的 Result 属性。
37         }
38         Random rd = new Random();
39         long longtime(int pp,BackgroundWorker bk,DoWorkEventArgs e)
40         {
41             long time=0;
42             int i = 0;
43             while (i < pp)
44             {
45                 i++;
46                 //判断是否取消后台操作
47                 if (bk.CancellationPending)
48                 {
49                     e.Cancel = true;
50                     break;
51                 }
52                 else
53                 {
54                     time += i;
55                 }
56                 //完成率
57                 int view = (int)((float)i / pp * 100);
58                 bk.ReportProgress(view);//已完成后台操作的百分完成率,范围0%-100%
59                 System.Threading.Thread.Sleep(5);//sleep()里面的数字越少就越快
60             }
61             return time;
62         }
63
64         private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
65         {
66             if (e.Cancelled)
67             {
68                 MessageBox.Show("取消");
69             }
70             else
71             {
72                 MessageBox.Show(e.Result.ToString());
73             }
74         }
75
76         private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
77         {
78             progressBar1.Value = e.ProgressPercentage;//获取异步任务的进度百分比
79             label1.Text = e.ProgressPercentage.ToString();//显示出来
80         }
81
82         private void button2_Click(object sender, EventArgs e)
83         {
84             backgroundWorker1.CancelAsync();
85         }
86
87     }
88 }

代码作者：Kiss_零@http://bbs.bccn.net/

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