c# 图片加相框

 //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)
                {
                }