[StructLayout(LayoutKind.Sequential)]
public struct FLASHWINFO
{
public UInt32 cbSize;
public IntPtr hwnd;
public UInt32 dwFlags;
public UInt32 uCount;
public UInt32 dwTimeout;
}

public class PInvoke
{
[DllImport("user32.dll")]
public static extern Int16 FlashWindowEx(ref FLASHWINFO pwfi);

//Stop flashing. The system restores the window to its original state.
public const UInt32 FLASHW_STOP = 0;
//Flash the window caption.
public const UInt32 FLASHW_CAPTION = 1;
//Flash the taskbar button.
public const UInt32 FLASHW_TRAY = 2;
//Flash both the window caption and taskbar button.
//This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags.
public const UInt32 FLASHW_ALL = 3;
//Flash continuously, until the FLASHW_STOP flag is set.
public const UInt32 FLASHW_TIMER = 4;
//Flash continuously until the window comes to the foreground.
public const UInt32 FLASHW_TIMERNOFG = 12;

}

//最小化的时候闪烁

//this.WindowState == WindowState.Minimized

FLASHWINFO finfo = new FLASHWINFO();
finfo.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(finfo);
finfo.hwnd = new WindowInteropHelper(this).Handle;
finfo.uCount = 600;
finfo.dwTimeout = 400;
finfo.dwFlags = PInvoke.FLASHW_TRAY | PInvoke.FLASHW_TIMER | PInvoke.FLASHW_TIMERNOFG;
PInvoke.FlashWindowEx(ref finfo);