asp.net文件下载的几种方式

摘自：http://zhidao.baidu.com/question/171876794.html

阅：经验证，//使用WriteFile下载文件 这个方法，是可以用的；

asp.net2.0以后，我们有了很多种文件下载的选择。

public partial class FileDownLoad : System.Web.UI.Page   
    {   
        //提供下载的文件，不编码的话文件名会乱码   
        private string fileName = HttpContext.Current.Server.UrlEncode("规范.rar");   
        private string filePath = HttpContext.Current.Server.MapPath("规范.rar");   
        //使用TransmifFile下载文件   
        protected void btnDL1_Click(object sender, EventArgs e)   
        {   
            FileInfo info = new FileInfo(filePath);   
            long fileSize = info.Length;   
            Response.Clear();   
            Response.ContentType = "application/x-zip-compressed";   
            Response.AddHeader("Content-Disposition", "attachment;filename="+ fileName);   
            //不指明Content-Length用Flush的话不会显示下载进度   
            Response.AddHeader("Content-Length", fileSize.ToString());   
            Response.TransmitFile(filePath, 0, fileSize);   
            Response.Flush();   
            Response.Close();   
        }   
  
        //使用WriteFile下载文件   
        protected void btnDL2_Click(object sender, EventArgs e)   
        {   
            FileInfo info = new FileInfo(filePath);   
            long fileSize = info.Length;   
            Response.Clear();   
            Response.ContentType = "application/octet-stream";   
            Response.AddHeader("Content-Disposition", "attachement;filename=" + fileName);   
            //指定文件大小   
            Response.AddHeader("Content-Length", fileSize.ToString());   
            Response.WriteFile(filePath, 0, fileSize);   
            Response.Flush();   
            Response.Close();   
        }