【WinForm】自己写一个截图软件--像素复制

public class ImageUtil
   {
       public static Bitmap GetBitmapFromImage(Bitmap source,Rectangle selectRectangle)
       {
           Bitmap bm = new Bitmap(selectRectangle.Size.Width, selectRectangle.Size.Height);

           for (int i = 0; i < selectRectangle.Width; i++)
           {
               for (int j = 0; j < selectRectangle.Height; j++)
               {
                   var p = source.GetPixel(selectRectangle.Location.X + i, selectRectangle.Location.Y + j);
                   bm.SetPixel(i, j, p);
               }
           }
           return bm;
       }
       public static Bitmap GetBitmapFromImage(Image imgSource, Rectangle selectRectangle)
       {
           Bitmap source = imgSource as Bitmap;
           if(source==null) return null;
           return GetBitmapFromImage(source, selectRectangle);
       }
   }