C# 后台处理图片的几种方法

 var supportedTypes = new[] { "jpg", "jpeg", "png", "gif", "bmp" };          var fileName = System.Web.HttpContext.Current.Request.Files[0].FileName;          var fileExt = System.IO.Path.GetExtension(fileName).Substring(1);          if (!supportedTypes.Contains(fileExt))          {            return Json(new { msg = -1 });          }          Random r = new Random();          var filename = DateTime.Now.ToString("yyyyMMddHHmmss") + r.Next(10000) + "." + fileExt;          var filepath = Path.Combine(Server.MapPath("~/avatar/temp"), filename);          head.SaveAs(filepath);

//filePath 图片物理地址FileStream fs = new FileStream(filepath, FileMode.Open);          byte[] byData = new byte[fs.Length];          fs.Read(byData, 0, byData.Length);          fs.Close();

 HttpPostedFile file = System.Web.HttpContext.Current.Request.Files[0];        if ((file == null))        {          return Json(new { Success = false, Msg = "上传图片失败", Path = "" });        }        else        {          System.Drawing.Image image = System.Drawing.Image.FromStream(file.InputStream);          MemoryStream ms = new MemoryStream();          image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);          byte[] byteData = new byte[ms.Length];          ms.Position = 0;          ms.Read(byteData, 0, byteData.Length);          ms.Close();          image.Dispose();                 }      }