c# - 进度栏值与Windows 7中呈现的内容不同步

Question

似乎在Windows 7中，设置进度条的值时会发生一些动画。设置该值似乎并不等待动画完成。有什么方法可以通知进度条何时完成动画制作？

我有一个示例程序。请查看评论。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Threading;

namespace Testing
{
   static class Program
   {
      [STAThread]
      static void Main()
      {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);
         var form = new Form1();
         form.Run();
      }
   }

   public partial class Form1 : Form
   {
      public Form1()
      {
         InitializeComponent();
      }

      public void Run()
      {
         Thread thread = new Thread
         (
            delegate()
            {
               ProgressBarMax = 10;
               ProgressValue = 0;

               for (int i = 0; i < 10; i++)
               {
                  Thread.Sleep(1000);
                  ProgressValue++;
               }
            }
         );
         EventHandler show = delegate
         {
            thread.Start();
         };

         Shown += show;
         ShowDialog();
         Shown -= show;
      }

      public int ProgressBarMax
      {
         set
         {
            Invoke
            (
               (MethodInvoker)
               delegate
               {
                  progressBar1.Maximum = value;
               }
            );
         }
      }

      public int ProgressValue
      {
         get
         {
            return progressBar1.Value;
         }
         set
         {
            Invoke
            (
               (MethodInvoker)
               delegate
               {
                  label1.Text = value.ToString();
                  progressBar1.Value = value;

                  // setting the value is not blocking until the
                  // animation is completed. it seems to queue
                  // the animation and as a result a sleep of 1 second
                  // will cause the animation to sync up with the UI
                  // thread.

                  // Thread.Sleep(1000); // this works but is an ugly hack

                  // i need to know if there is a callback to notify me
                  // when the progress bar has finished animating.
                  // then i can wait until that callback is handled 
                  // before continuing.

                  // if not, do i just create my own progress bar?
               }
            );
         }
      }
   }
}

我的Google Kung Foo今天似乎死了。谢谢。

Answer 1

最后，这是与C# progress bar not synced with download (WebClient class)相同的问题。

此问题也与ProgressBar is slow in Windows Forms相似。此处的解决方案是向前和向后移动值，即progressBar1.Value = value + 1; progressBar1.Value = value;。第一次更新开始动画序列，而第二次更新强制动画序列提前停止。它是一个很好的解决方法，但是会引入难以重现的问题。似乎没有一个真正的解决方案。

最后，Disabling progress bar animation on Vista Aero建议关闭主题。这似乎可行，但是进度条失去了外观。最终，最好的办法就是创建自己的进度栏。

Microsoft应该只是将动画作为一种选择，而不是强迫开发人员重新发明进度条。