Winform下richtextbox截图实现

  #region 根据richtextbox创建GDI+
         private void DrawGDI(RichTextBox rich,Panel panl,PictureBox p2)
         {
             rich.Update();
             Bitmap bmp = new Bitmap(rich.Width, rich.Height);
             using (Graphics gr = Graphics.FromImage(bmp))
             {
                 gr.CopyFromScreen(rich.PointToScreen(Point.Empty), Point.Empty, rich.Size);
             }
             p2.Image = bmp;
             panl.Controls.Remove(rich);
             panl.Controls.Add(p2);
             panl.Update();
         }
         #endregion