c# C#获取屏幕鼠标坐标点颜色

 [DllImport("user32.dll")]
        private static extern IntPtr GetDC(IntPtr hwnd);

        [DllImport("gdi32.dll")]
        private static extern int GetPixel(IntPtr hdc, Point p);

        public static Color getColor(Point p)
        {

            // Point p = new Point(MousePosition.X, MousePosition.Y);//取置顶点坐标
            IntPtr hdc = GetDC(new IntPtr(0));//取到设备场景(0就是全屏的设备场景)
            int c = GetPixel(hdc, p);//取指定点颜色
            int r = (c & 0xFF);//转换R
            int g = (c & 0xFF00) / 256;//转换G
            int b = (c & 0xFF0000) / 65536;//转换B
            // pictureBox1.BackColor = Color.FromArgb(r, g, b);
            return Color.FromArgb(r, g, b);

        }

　　测试例子：

        private void button1_Click(object sender, EventArgs e)
        {
            //测试X在200，Y在120 到500 的颜是否不等于 Color.FromArgb(255, 246, 246, 246);
            string d = DateTime.Now.ToLongTimeString();
            Color cl = Color.FromArgb(255, 246, 246, 246);
            Point p = new Point(200,0);
           for (int h = 120; h < 500; h+=8) {
                p.Y = h;

            if(getColor(p).Equals(cl)==false ){

                  Text =""+ h;
               break;
             }

            } 

            Text = d +":"+  DateTime.Now.ToLongTimeString() +"  "+ p ;

        }