MVC下载远程文件流(WebClient)

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public ActionResult DownLoad_File()         {                           return File(ScLiu(PathUrl), "application/octet-stream", "sb.pdf");                       }   public Stream ScLiu(string path)         {             using (System.IO.MemoryStream memStream = new System.IO.MemoryStream())             {                 WebClient webClient = new WebClient();                 var obj = webClient.OpenRead(path);                 return obj;             }         }