.NET MVC 后台接受base64的上传图片

         #region 配合前端的多张图片上传
         #region 上传图片方法
         /// <summary>
         /// 接口方法
         /// </summary>
         /// <param name="img">带 data:image/jpeg;base64,的base64的图片</param>
         /// <returns>图片路径</returns>
         [HttpPost]
         public ActionResult GETaddimg2(String img)
         {
             if (img == null)
             {
                 return Json("空");
             }
             else
             {
                 return Json(PDUploadImage(img), JsonRequestBehavior.AllowGet);
             }
         }
         #endregion
         #region 图片转化
         /// <summary>
         /// base64 的字符串
         /// </summary>
         /// <param name="img"></param>
         /// <returns>图片转成32的名字</returns>
         public JsonResult PDUploadImage(string img)
         {
             string error = "";
             return Json(SaveImage("/Upload/Article", img, ref error), JsonRequestBehavior.AllowGet);
         }
         #endregion
         #region 截取data:image/jpeg;base64,提取图片，并保存图片
         /// <summary>
         /// 截取data:image/jpeg;base64,提取图片，并保存图片
         /// </summary>
         /// <param name="file_name"></param>
         /// <param name="img_string">base64的字符串</param>
         /// <param name="error">错误的图片格式</param>
         /// <returns>路径 + 图片的名称</returns>
         private string SaveImage(string file_name, string img_string, ref string error)
         {
             //try
             //{
             string[] img_array = img_string.Split(',');
             byte[] arr = Convert.FromBase64String(img_array[]);
             using (MemoryStream ms = new MemoryStream(arr))
             {
                 Bitmap bmp = new Bitmap(ms);
                 if (img_array[].ToLower() == "data:image/jpeg;base64")
                 {
                     bmp.Save(file_name + ".jpg");
                     return SetImg(Guid.NewGuid().ToString().Replace('-', 'p').Substring(), "jpg", arr);
                 }
                 else if (img_array[].ToLower() == "data:image/png;base64")
                 {
                     bmp.Save(file_name + ".png");
                     return SetImg(Guid.NewGuid().ToString().Replace('-', 'p').Substring(), "png", arr);
                 }
                 else if (img_array[].ToLower() == "data:image/gif;base64")
                 {
                     bmp.Save(file_name + ".gif");
                     return SetImg(Guid.NewGuid().ToString().Replace('-', 'p').Substring(), "gif", arr);
                 }
                 else
                 {
                     error = "不支持该文件格式。";
                     return "错";
                 }
             }
             //}
             //catch (Exception ex)
             //{
             //    error = "生成图片发生错误。" + ex.ToString();
             //    return "错";
             //}
         }
         #endregion
         #region 保存图片路径及设置名称
         /// <summary>
         /// 保存到文件路径
         /// </summary>
         /// <param name="ImgName">保存的文件名称</param>
         /// <param name="suffix">后缀名</param>
         /// <param name="arr">base64</param>
         /// <returns>图片的路径</returns>
         public string SetImg(string ImgName, string suffix, byte[] arr)
         {
             string str3 = System.AppDomain.CurrentDomain.BaseDirectory;//找到相对路径
             string str4 = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;//找到相对路径
             System.IO.File.WriteAllBytes(str3 + "/Upload/Article/" + ImgName + "." + suffix + "", arr);
             return "/Upload/Article/" + ImgName + "." + suffix + "";
         }
         #endregion
         #endregion