C#实现图片加相框的方法

//加边框try{  Bitmap Backbmp = new Bitmap(@"" + Path);  float w = (float)(Backbmp.Width * 0.2);  using (Graphics g = Graphics.FromImage(Backbmp))  {    using (Brush brush = new SolidBrush(Color.FromArgb(0, 156, 255)))    {      using (Pen pen = new Pen(brush, w))      {        pen.DashStyle = DashStyle.Custom;        g.DrawRectangle(pen, new Rectangle(0, 0, Math.Abs(Backbmp.Width), Math.Abs(Backbmp.Height)));        g.Dispose();        pic.BackgroundImage = Backbmp;      }    }  }}catch (Exception){}//加椭圆try{  Bitmap Backbmp = new Bitmap(@"" + Path);  float w = (float)(Backbmp.Width * 0.2);  using (Graphics g = Graphics.FromImage(Backbmp))  {    using (Brush brush = new SolidBrush(Color.FromArgb(0, 156, 255)))    {      using (Pen pen = new Pen(brush, w))      {        pen.DashStyle = DashStyle.Custom;        g.DrawEllipse(pen, new Rectangle(0, 0, Math.Abs(Backbmp.Width), Math.Abs(Backbmp.Height)));        g.Dispose();        pic.BackgroundImage = Backbmp;      }    }  }}catch (Exception){}