IOS文件下载时，文件名的处理

            string contentType = MimeMapping.GetMimeMapping(name);var isIOS = false;
            if (Request.UserAgent != null && (Request.UserAgent.Contains("iPhone") || Request.UserAgent.Contains("iPad")))
            {
                isIOS = true;
            }
            var isWeChat = false;
            ///Mozilla/5.0 (iPhone; CPU iPhone OS 14_5 like Mac OS X) 
            ///AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/8.0.12(0x18000c28) NetType/WIFI Language/zh_CN
            ///
            ///Mozilla/5.0 (iPhone; CPU iPhone OS 14_5 like Mac OS X) 
            ///AppleWebKit /605.1.15 (KHTML, like Gecko)  Mobile/15E148 wxwork/3.1.15 MicroMessenger/7.0.1 Language/zh ColorScheme/Light
            if (Request.UserAgent != null&&(Request.UserAgent.Contains("MicroMessenger")) && (Request.UserAgent.Contains("wxwork")))
            {
                isWeChat = false;
            }
            else if (Request.UserAgent != null && (Request.UserAgent.Contains("MicroMessenger")))
            {
                isWeChat = true;
            }
             WebClient my = new WebClient();
             mybyte = my.DownloadData(pingUrl);
             if (isIOS)
             {
               if (isWeChat)
                {
                  Response.AppendHeader("Content-Disposition", "filename=" + name);
                  return File(mybyte, contentType, Url.Encode(name));
                }
               else {
                 Response.AppendHeader("Content-Disposition", "attachment;filename=" + name);
                 return File(mybyte, contentType, name);
               }
             }
             return File(mybyte, contentType, Url.Encode(name));