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