Asp.net获取服务器指定文件夹目录文件并提供下载的方法

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>");

    }

}