在某个特定时刻，我的 WPF 应用需要用户关注。我知道可以使 Windows 7 任务栏图标以黄色闪烁。
到目前为止我试过了：
Window.Activate 尝试将窗口置于前台并激活它。Window.Focus 尝试将此元素设置为焦点。有什么建议吗？
【问题讨论】：
标签： .net wpf windows-7 taskbar
这是一种可能的解决方案：http://www.jarloo.com/flashing-a-wpf-window/
在代码示例中，为 Window 类创建了两个扩展方法：FlashWindow 和 StopFlashingWindow：
private const UInt32 FLASHW_STOP = 0; //Stop flashing. The system restores the window to its original state. private const UInt32 FLASHW_CAPTION = 1; //Flash the window caption.
private const UInt32 FLASHW_TRAY = 2; //Flash the taskbar button.
private const UInt32 FLASHW_ALL = 3; //Flash both the window caption and taskbar button.
private const UInt32 FLASHW_TIMER = 4; //Flash continuously, until the FLASHW_STOP flag is set.
private const UInt32 FLASHW_TIMERNOFG = 12; //Flash continuously until the window comes to the foreground.
[StructLayout(LayoutKind.Sequential)]
private struct FLASHWINFO
{
public UInt32 cbSize; //The size of the structure in bytes.
public IntPtr hwnd; //A Handle to the Window to be Flashed. The window can be either opened or minimized.
public UInt32 dwFlags; //The Flash Status.
public UInt32 uCount; // number of times to flash the window
public UInt32 dwTimeout; //The rate at which the Window is to be flashed, in milliseconds. If Zero, the function uses the default cursor blink rate.
}
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
public static void FlashWindow(this Window win, UInt32 count = UInt32.MaxValue)
{
//Don't flash if the window is active
if (win.IsActive) return;
WindowInteropHelper h = new WindowInteropHelper(win);
FLASHWINFO info = new FLASHWINFO
{
hwnd = h.Handle,
dwFlags = FLASHW_ALL | FLASHW_TIMER,
uCount = count,
dwTimeout = 0
};
info.cbSize = Convert.ToUInt32(Marshal.SizeOf(info));
FlashWindowEx(ref info);
}
public static void StopFlashingWindow(this Window win)
{
WindowInteropHelper h = new WindowInteropHelper(win);
FLASHWINFO info = new FLASHWINFO();
info.hwnd = h.Handle;
info.cbSize = Convert.ToUInt32(Marshal.SizeOf(info));
info.dwFlags = FLASHW_STOP;
info.uCount = UInt32.MaxValue;
info.dwTimeout = 0;
FlashWindowEx(ref info);
}
访问http://www.jarloo.com/flashing-a-wpf-window/ 获取完整源代码。
相当有趣的场景。我原以为这会很简单。如果我不得不做类似的事情，我会为这个问题添加书签:)
【讨论】：
最好使用为此目的而设计的 Windows 7 功能 - 任务栏覆盖图标。 http://10rem.net/blog/2009/12/09/overlaying-icons-on-the-windows-7-taskbar-with-wpf-4 是您可以看到的众多地方之一。
如果在长时间运行的过程中需要注意，我会使用任务栏进度条覆盖（在 WPF 中也很容易做到）并将其状态从正常更改为暂停或错误，分别显示为黄色和红色.这会引起用户的注意。
【讨论】：
Scott 的例子要简单得多……谢谢 Scott！
using System.Windows.Interop;
using System.Runtime.InteropServices;
[DllImport("user32")] public static extern int FlashWindow(IntPtr hwnd, bool bInvert);
WindowInteropHelper wih = new WindowInteropHelper(ThisWindow);
FlashWindow(wih.Handle, true);
【讨论】：
按照 Kate 的建议，我使用了这样的任务栏进度：
XAML：
<Window.TaskbarItemInfo>
<TaskbarItemInfo x:Name="taskBarItem"/>
</Window.TaskbarItemInfo>
cs:
taskBarItem.ProgressState = System.Windows.Shell.TaskbarItemProgressState.Indeterminate;
这会使任务栏图标闪烁绿色，这足以让我的用例吸引用户注意长时间运行的应用程序。
【讨论】：