string dirPath = HttpContext.Current.Server.MapPath("uploads/"); if (Directory.Exists(dirPath)) {        //获得目录信息        DirectoryInfo dir = new DirectoryInfo(dirPath);        //获得目录文件列表        FileInfo[] files = dir.GetFiles("*.*");        string[] fileNames = new string[files.Length];        //临时数据表        DataTable dt = new DataTable();        dt.Columns.Add("FileName");               foreach (FileInfo fileInfo in files)        {     DataRow dr = dt.NewRow();     dr["FileName"] = fileInfo.Name;     dt.Rows.Add(dr);        }        Repeater1.DataSource = dt;        Repeater1.DataBind(); } if (e.CommandName == "down") {     try     {      string DownloadFileName = "~/uploads/" + e.CommandArgument.ToString();//文件路径      string filepath = Server.MapPath(DownloadFileName);      string filename = Path.GetFileName(filepath);      FileInfo file = new FileInfo(filepath);      Response.Clear();      Response.ContentType = "application/octet-stream";      Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));      Response.AddHeader("Content-length", file.Length.ToString());      Response.Flush();      Response.WriteFile(filepath);     }     catch     {  Response.Write("<script>alert('没有找到下载的源文件')</script>");     } }