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 public static void DownLoadFile(string fileName, HttpResponse Response, HttpServerUtility Server)
     {
         string path = Server.MapPath("~/UpFiles/" + fileName);
         FileInfo fileInfo = new FileInfo(path);
 
         //TextWriter writer = new StreamWriter(defultPath);
         //HttpResponse Response = new HttpResponse(writer);
 
         Response.Clear();
 
         Response.ClearContent();
 
         Response.ClearHeaders();
 
         Response.AppendHeader("Content-Disposition", "attachment;   filename=\"" + Server.UrlEncode(fileName) + "\"");
 
         Response.AddHeader("Content-Length", fileInfo.Length.ToString());
 
         Response.AddHeader("Content-Transfer-Encoding", "binary");
 
         Response.ContentType = "application/octet-stream";
 
         Response.ContentEncoding = System.Text.Encoding.UTF8;
 
         Response.WriteFile(fileInfo.FullName);
 
         Response.Flush();
 
         Response.End();
     }

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防中文乱码：Server.UrlEncode(fileName)