程序異常退出后，托盤殘留圖標清理方法（C#）

　　程序猿對於宕機再熟悉不過了，如果一個程序異常退出，那我們只能在Windows日志中找到它的蹤跡；如果它是一個托盤程序，異常退出后，它會停留在托盤中久久不能離去，直到我們的鼠標從它身上划過；如果一個程序被另一個守護程序不斷的殺掉、重啟，那么它的結果會如下圖所示，

　　請注意！！這不是掃雷！！沒錯，這正是殘留的圖標。解決方法其實很簡單，在程序每次開啟前，向托盤窗口發送鼠標經過消息WM_MOUSEMOVE，使其刷新。

　　首先要明確一點，托盤包括顯示區域和溢出區域，所以需要同時刷新，防止遺漏。可以用Spy++鼠標右鍵選擇“突出顯示”，窗口輪廓就會閃爍，SysPager和NotifyIconOverflowWindow。

代碼如下：

using System;
using System.Runtime.InteropServices;
 
public class TaskBarUtil
{
    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", string.Empty);
        var TrayNotifyWndHandle = FindWindowEx(TrayWndHandle, IntPtr.Zero, "TrayNotifyWnd", string.Empty);
        var SysPagerHandle = FindWindowEx(TrayNotifyWndHandle, IntPtr.Zero, "SysPager", string.Empty);
        var NotifyAreaHandle = FindWindowEx(SysPagerHandle, IntPtr.Zero, "ToolbarWindow32", string.Empty);

        return NotifyAreaHandle;
    }
  
    private static IntPtr GetNotifyOverHandle()
    {
        var OverHandle = FindWindowEx(IntPtr.Zero, IntPtr.Zero, "NotifyIconOverflowWindow", string.Empty);
        var NotifyOverHandle = FindWindowEx(OverHandle, IntPtr.Zero, "ToolbarWindow32", string.Empty);
        
        return NotifyOverHandle;
    }
 
    [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);
}

TaskBarUtil.RefreshNotification();

托盤又恢復往日簡潔 ^_^