C#裁剪图片 需实现一个上传裁剪头像功能 记录以下代码 以备后用

	    int x1=0;//从X坐标开始
	    int y1=0;//从Y坐标开始
	    //获取图片
	    System.Drawing.Image imgPhoto = System.Drawing.Image.FromFile(Server.MapPath(img_src));
	    //用于缩小图片尺寸
            System.Drawing.Bitmap bitmap2 = null;
            //新建一个bmp图片 指定裁剪大小
            System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(114, 145);
            //新建一个画板
            Graphics g = System.Drawing.Graphics.FromImage(bitmap);
            //设置高质量插值法
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //清空画布并以白色填充
            g.Clear(Color.White);
            //如果图片尺寸大于 条件 则 缩小图片 后进行裁剪
            if (imgPhoto.Height > 290 || imgPhoto.Width > 228)
            {
                bitmap2 = new Bitmap(imgPhoto, 228, 290);
            }
	    //是否进行缩小裁剪
            if (bitmap2 != null)
            {
                g.DrawImage(bitmap2, new Rectangle(0, 0, bitmap2.Width, bitmap2.Height), new Rectangle(x1, y1, bitmap2.Width, bitmap2.Height), GraphicsUnit.Pixel);

            }
            else
            {
                g.DrawImage(imgPhoto, new Rectangle(0, 0, imgPhoto.Width, imgPhoto.Height), new Rectangle(x1, y1, imgPhoto.Width, imgPhoto.Height), 

GraphicsUnit.Pixel);
            }
            try
            {
              //图片存储路径
              string img_src2 = UrlConfig.PersonLogo + PersonSession.GetUserModel().ID + ".jpg";
              bitmap.Save(Server.MapPath(img_src2), System.Drawing.Imaging.ImageFormat.Jpeg);
              imgPhoto.Dispose();
              if (bitmap2 != null)
              {
                 bitmap2.Dispose();
              }
              bitmap.Dispose();
              g.Dispose();
            }
            catch (System.Exception e)
            {
               
            }
            finally
            {
                if (bitmap2 != null)
                {
                    bitmap2.Dispose();
                }
                imgPhoto.Dispose();
                bitmap.Dispose();
                g.Dispose();
            }