在Windows中,如何以编程方式使整个屏幕闪烁黑白？

using System;
using System.Runtime.InteropServices;

namespace ScreenFlash
{
    class Program
    {
        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr hwnd);

        [DllImport("user32.dll")]
        static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);

        [DllImport("gdi32.dll")]
        static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

        [DllImport("gdi32.dll")]
        static extern uint SetPixel(IntPtr hdc, int nXPos, int nYPos, uint crColor);

        static void Main(string[] args)
        {
            IntPtr hdc = GetDC(IntPtr.Zero);
            int screenWidth = GetSystemMetrics(SystemMetric.SM_CXSCREEN);
            int screenHeight = GetSystemMetrics(SystemMetric.SM_CYSCREEN);

            for (int i = 0; i < 10; i++)
            {
                for (int x = 0; x< screenWidth; x++)
                {
                    for (int y = 0; y< screenHeight; y++)
                    {
                        uint pixelColor = GetPixel(hdc, x, y);
                        uint oppositeColor = (pixelColor == 0xFFFFFF) ? 0x000000 : 0xFFFFFF;
                        SetPixel(hdc, x, y, oppositeColor);
                    }
                }
                System.Threading.Thread.Sleep(100);

                for (int x = 0; x< screenWidth; x++)
                {
                    for (int y = 0; y< screenHeight; y++)
                    {
                        uint pixelColor = GetPixel(hdc, x, y);
                        uint oppositeColor = (pixelColor == 0xFFFFFF) ? 0x000000 : 0xFFFFFF;
                        SetPixel(hdc, x, y, oppositeColor);
                    }
                }
                System.Threading.Thread.Sleep(100);
            }

            ReleaseDC(IntPtr.Zero, hdc);
        }

        public enum SystemMetric : int
        {
            SM_CXSCREEN = 0,
            SM_CYSCREEN = 1
        }

        [DllImport("user32.dll")]
        static extern int GetSystemMetrics(SystemMetric smIndex);
    }
}