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:

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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 ;
 
}
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