C#控件刷新

 1 int count = 0;
 2 int success_count = 0;
 3 foreach (string gen in fn_gen)
 4 {
 5     //MessageBox.Show(gen);
 6     Bitmap Bi = new Bitmap(gen);  //使用打开的图片路径创建位图对像
 7     Image Image = Bi;
 8     if (Image.Width >= 170 && Image.Height >= 200)
 9     { 
10         string destinationFile = result + gen.Substring(gen.LastIndexOf(@"\"), gen.Length - gen.LastIndexOf(@"\"));
11         bool isrewrite = true; // true=覆盖已存在的同名文件,false则反之
12         System.IO.File.Copy(gen, destinationFile, isrewrite);
13         success_count++;
14         this.Txt_Count.Refresh();
15         this.Txt_Count.Text = success_count.ToString() + "/" + count.ToString();
16         Application.DoEvents();// Application.DoEvents()的作用：处理所有的当前在消息队列中的Windows消息。
17         System.Threading.Thread.Sleep(100);
18     }
19     count++;
20     Bi = null;
21     System.GC.Collect();
22 }