[C#] C#并发编程-异步编程基础-报告进度

 1     int ProgressRate = 0;
 2 
 3     private async void btnProgress_Click(object sender, EventArgs e)
 4     {
 5         ProgressRate = 0;
 6 
 7         var progress = new Progress<int>();
 8 
 9         //progress的进度改变
10         progress.ProgressChanged += (obj1, obj2) =>
11         {
12             if (ProgressRate <= 100)
13             {
14                 this.lblProgress.Content = ProgressRate.ToString() + "%";
15                 this.pbProgress.Value = ProgressRate;
16             }
17             else
18             {
19                 this.btnProgress.IsEnabled = true;
20             }
21 
22         };
23 
24         this.btnProgress.IsEnabled = false;
25         await ReportProgressAsync(progress);
26     }
27 
28     //在此报告progress的进度，更改ProgressRate的值
29     private async Task ReportProgressAsync(IProgress<int> progress = null)
30     {
31         while (ProgressRate <= 100)
32         {
33             if (progress != null)
34             {
35                 await Task.Delay(TimeSpan.FromMilliseconds(100));
36                 progress.Report(ProgressRate++);
37             }
38         }
39     }