怎么下载 txt文件 而不是在浏览器中打开

[cfsjjjj]

我想用a 标签直接下载，而不是在浏览器中打开

比如：
<a href="http://www.aa.com/file/aa.txt">文件</a> 就能直接下载aa.txt文件 这样能不能实现 不能的话应该这么做

[itrefer]

可针对下载做单独的 hander去处理 输出为文件类型就ok了

[边城的刀声]

在IIS中给txt文件加个头
Content-disposition: attachment;
或者是像1楼所说那样，不过那样会加对asp.net造成一些压力

[lilihua520]

    protected void  Button1_Click1(object sender, EventArgs e)
    {
         //TransmitFile实现下载
         /**//*
          微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
          下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
          代码如下：
         */

        Response.ContentType = "application/x-zip-compressed";
        Response.AddHeader("Content-Disposition", "attachment;filename=keji.rar");
        string filename = Server.MapPath("keji.rar");
        Response.TransmitFile(filename);
        Response.Write("<script language=\"javascript\" type=\"text/javascript\">");
        Response.Write("alert(\"下载成功\");");
        Response.Write("window.location.href=\"C_SC.aspx\";");
        Response.Write("</script>");
    }
    protected void Button2_Click(object sender, EventArgs e)
    {

        //WriteFile实现下载
        string fileName = "ceshi.rar";//客户端保存的文件名
        string filePath = Server.MapPath("keji.rar");//路径

        FileInfo fileInfo = new FileInfo(filePath);
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
        Response.AddHeader("Content-Length", fileInfo.Length.ToString());
        Response.AddHeader("Content-Transfer-Encoding", "binary");
        Response.ContentType = "application/octet-stream";
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
        Response.WriteFile(fileInfo.FullName);
       Response.Flush();
        Response.End();

    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        //WriteFile分块下载

        string fileName = "GhostXP.iso";//客户端保存的文件名
        string filePath = Server.MapPath("keji.rar");//路径

         System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

        if (fileInfo.Exists == true)
         {
            const long ChunkSize = 409600;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
            byte[] buffer = new byte[ChunkSize];

             Response.Clear();
             System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
             long dataLengthToRead = iStream.Length;//获取下载的文件总大小
               Response.ContentType = "application/octet-stream";
             Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
            while (dataLengthToRead > 0 && Response.IsClientConnected)
             {
                int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
                 Response.OutputStream.Write(buffer, 0, lengthRead);
                 Response.Flush();
                 dataLengthToRead = dataLengthToRead - lengthRead;
             }
             Response.Close();
         }
     }

    //字符流方式下载文件
    protected void Button4_Click(object sender, EventArgs e)
    {
        string fileName = "ce2.rar";//客户端保存的文件名
        string filePath = Server.MapPath("keji.rar");//路径

        //以字符流的形式下载文件
        FileStream fs = new FileStream(filePath, FileMode.Open);
        byte[] bytes = new byte[(int)fs.Length];
        fs.Read(bytes, 0, bytes.Length);
        fs.Close();
        Response.ContentType = "application/octet-stream";
        //通知浏览器下载文件而不是打开
        Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();

    }

[Arthur080319]

//后台方法 A标签单击的时候调用就是了
string filename = System.IO.Path.GetFileName(filepath);
FileInfo fileInfo = new FileInfo(filepath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.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.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();

[边城的刀声]

如果txt文件多的话，把txt文件放在一个文件夹下，然后对这个文件夹，加刚才说的那个头

[我说我行就是行]

哈，添加到解压文件中，然后给个地址就OK啦！