C#实现win7任务栏进度条

win7的任务栏进度条有一个专门的类TaskbarManager，他在Windows API Code Pack里面，下载地址：http://archive.msdn.microsoft.com/WindowsAPICodePack 里面包含了所有的源代码以及大量的示例，并附有文档。

为了使用TaskbarManager类，首先要引用Microsoft.WindowsAPICodePack.dll和Microsoft.WindowsAPICodePack.Shell.dll这两个库，他们在binaries文件夹里，然后在程序里申明 Microsoft.WindowsAPICodePack.Taskbar和Microsoft.WindowsAPICodePack.Shell。具体用法看下面的例子，这是Windows API Code Pack 1.1\source\Samples\Shell\TaskbarDemo例子的一部分，还有其他功能就不一一列出来了，感兴趣的自己可以去看看。

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// Copyright (c) Microsoft Corporation.  All rights reserved.           using System;     using System.IO;     using System.Windows.Forms;     using Microsoft.WindowsAPICodePack.Shell;     using Microsoft.WindowsAPICodePack.Taskbar;     using System.Reflection;           namespace TaskbarDemo     {         public partial class ChildDocument : Form         {             // Keep a reference to the Taskbar instance             private TaskbarManager windowsTaskbar = TaskbarManager.Instance;             private JumpList childWindowJumpList;             private string childWindowAppId;                          void ChildDocument_Shown(object sender, EventArgs e)             {                 // Set our default                 windowsTaskbar.SetProgressState(TaskbarProgressBarState.NoProgress, this.Handle);             }                   #region Progress Bar                   private void trackBar1_Scroll(object sender, EventArgs e)             {                 // When the user changes the trackBar value,                 // update the progress bar in our UI as well as Taskbar                 progressBar1.Value = trackBar1.Value;                       windowsTaskbar.SetProgressValue(trackBar1.Value, 100, this.Handle);             }                         private void comboBoxProgressBarStates_SelectedIndexChanged(object sender, EventArgs e)             {                 // Update the status of the taskbar progress bar                       TaskbarProgressBarState state = (TaskbarProgressBarState)(Enum.Parse(typeof(TaskbarProgressBarState),                                  (string)comboBoxProgressBarStates.SelectedItem));                       windowsTaskbar.SetProgressState(state, this.Handle);                       // Update the application progress bar,                 // as well disable the trackbar in some cases                 switch (state)                 {                     case TaskbarProgressBarState.Normal:                         if (trackBar1.Value == 0)                         {                             trackBar1.Value = 20;                             progressBar1.Value = trackBar1.Value;                         }                               progressBar1.Style = ProgressBarStyle.Continuous;                         windowsTaskbar.SetProgressValue(trackBar1.Value, 100, this.Handle);                         trackBar1.Enabled = true;                         break;                     case TaskbarProgressBarState.Paused:                         if (trackBar1.Value == 0)                         {                             trackBar1.Value = 20;                             progressBar1.Value = trackBar1.Value;                         }                               progressBar1.Style = ProgressBarStyle.Continuous;                         windowsTaskbar.SetProgressValue(trackBar1.Value, 100, this.Handle);                         trackBar1.Enabled = true;                         break;                     case TaskbarProgressBarState.Error:                         if (trackBar1.Value == 0)                         {                             trackBar1.Value = 20;                             progressBar1.Value = trackBar1.Value;                         }                               progressBar1.Style = ProgressBarStyle.Continuous;                         windowsTaskbar.SetProgressValue(trackBar1.Value, 100, this.Handle);                         trackBar1.Enabled = true;                         break;                     case TaskbarProgressBarState.Indeterminate:                         progressBar1.Style = ProgressBarStyle.Marquee;                         progressBar1.MarqueeAnimationSpeed = 30;                         trackBar1.Enabled = false;                         break;                     case TaskbarProgressBarState.NoProgress:                         progressBar1.Value = 0;                         trackBar1.Value = 0;                         progressBar1.Style = ProgressBarStyle.Continuous;                         trackBar1.Enabled = false;                         break;                 }             }                   #endregion                                       private void button1_Click(object sender, EventArgs e)             {                 childWindowJumpList = JumpList.CreateJumpListForIndividualWindow(childWindowAppId, this.Handle);                       ((Button)sender).Enabled = false;                 groupBoxCustomCategories.Enabled = true;                 buttonRefreshTaskbarList.Enabled = true;             }         }     }

首先获得程序的一个TaskbarManager对象，上面是调用TaskbarManager.Instance实现的，这是一个静态方法，得到windowsTaskbar对象。TaskbarManager有一个SetProgressValue方法，通过调用它就可以设置任务栏进度条的Value，他有多种重载方式，请参考说明文档。SetProgressState方法用来设置任务栏进度条的状态，共有5种状态NoProgress、Indeterminate、Normal、Error、Paused。

运行效果如下图：

当然还可以设置OverlayIcon、ThumbnailToolbar 、TabbedThumbnail 来美化我们的程序，在pack提供的sample中都有他们的使用例子。

最后一点，这种效果只有在win7或vista里才能使用（win8不知道，应该也行吧），所以在使用时要判断一下系统是不是支持。有三种方法，分别是：

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//方法一     if (System.Environment.OSVersion.Version.Major >= 6) //make sure you are not on a legacy OS     {     //.........................     }           //方法二           CoreHelpers.ThrowIfNotWin7();//不符合就return           //方法三     if(TaskbarManager.IsPlatformSupported)     {     //...................................     }