在我们开发Windows客户端程序时，往往会出现程序退出后，任务还保留之前程序的缓存图标。每打开关闭一次程序，图标会一直增加，导致托盘存放大量缓存图标。为了解决这个问题，我们可以通过下面的程序清理任务栏托盘图标缓存。

清理任务栏托盘缓存图标帮助类：

    public class TaskBarHelper{[DllImport("user32.dll", SetLastError = true)]static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);[DllImport("user32.dll")]static extern bool GetClientRect(IntPtr handle, out RECT rect);[DllImport("user32.dll", CharSet = CharSet.Auto)]static extern IntPtr SendMessage(IntPtr handle, UInt32 message, Int32 wParam, Int32 lParam);struct RECT{public int left, top, right, bottom;}public static void RefreshNotification(){var NotifyAreaHandle = GetNotifyAreaHandle();if (NotifyAreaHandle != IntPtr.Zero){RefreshWindow(NotifyAreaHandle);}var NotifyOverHandle = GetNotifyOverHandle();if (NotifyOverHandle != IntPtr.Zero){RefreshWindow(NotifyOverHandle);}}private static void RefreshWindow(IntPtr windowHandle){const uint WM_MOUSEMOVE = 0x0200;RECT rect;GetClientRect(windowHandle, out rect);for (var x = 0; x < rect.right; x += 5)for (var y = 0; y < rect.bottom; y += 5)SendMessage(windowHandle, WM_MOUSEMOVE, 0, (y << 16) + x);}private static IntPtr GetNotifyAreaHandle(){var TrayWndHandle = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "Shell_TrayWnd", null);var TrayNotifyWndHandle = FindWindowEx(TrayWndHandle, IntPtr.Zero, "TrayNotifyWnd", null);var SysPagerHandle = FindWindowEx(TrayNotifyWndHandle, IntPtr.Zero, "SysPager", null);var NotifyAreaHandle = FindWindowEx(SysPagerHandle, IntPtr.Zero, "ToolbarWindow32", null);return NotifyAreaHandle;}private static IntPtr GetNotifyOverHandle(){var OverHandle = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "NotifyIconOverflowWindow", null);var NotifyOverHandle = FindWindowEx(OverHandle, IntPtr.Zero, "ToolbarWindow32", null);return NotifyOverHandle;}}

主程序启动时调用：

        public MainView(){InitializeComponent();TaskBarHelper.RefreshNotification();}