asp.net 浏览器下载文件的四种方式

来源：互联网发布：儿童教育软件编辑：程序博客网时间：2024/05/16 07:08

其实不是自己想要的，自己希望能够弹一个窗口出来选择保存的路径

protected void Button1_Click(object sender, EventArgs e)    {protected void Button1_Click(object sender, EventArgs e)2    {3        //TransmitFile实现下载45        /**//*6         微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite7         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。8         代码如下：9        */1011        Response.ContentType = "application/x-zip-compressed";12        Response.AddHeader("Content-Disposition", "attachment;filename=keji.rar");13        string filename = Server.MapPath("keji.rar");14        Response.TransmitFile(filename);15        Response.Write("<script language=\"javascript\" type=\"text/javascript\">");16        Response.Write("alert(\"下载成功\");");17        Response.Write("window.location.href=\"C_SC.aspx\";");18        Response.Write("</script>");1920    }21    protected void Button2_Click(object sender, EventArgs e)22    {2324        //WriteFile实现下载25        string fileName = "ceshi.rar";//客户端保存的文件名26        string filePath = Server.MapPath("keji.rar");//路径2728        FileInfo fileInfo = new FileInfo(filePath);29        Response.Clear();30        Response.ClearContent();31        Response.ClearHeaders();32        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);33        Response.AddHeader("Content-Length", fileInfo.Length.ToString());34        Response.AddHeader("Content-Transfer-Encoding", "binary");35        Response.ContentType = "application/octet-stream";36        Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");37        Response.WriteFile(fileInfo.FullName);38        Response.Flush();39        Response.End();4041    }42    protected void Button3_Click(object sender, EventArgs e)43    {44        //WriteFile分块下载4546        string fileName = "GhostXP.iso";//客户端保存的文件名47        string filePath = Server.MapPath("GhostXP7.7.iso");//路径4849         System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);5051        if (fileInfo.Exists == true)52         {53            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54            byte[] buffer = new byte[ChunkSize];5556             Response.Clear();57             System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);58            long dataLengthToRead = iStream.Length;//获取下载的文件总大小59             Response.ContentType = "application/octet-stream";60             Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));61            while (dataLengthToRead > 0 && Response.IsClientConnected)62             {63                int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小64                 Response.OutputStream.Write(buffer, 0, lengthRead);65                 Response.Flush();66                 dataLengthToRead = dataLengthToRead - lengthRead;67             }68             Response.Close();69         }70     }7172    //字符流方式下载文件73    protected void Button4_Click(object sender, EventArgs e)74    {75        string fileName = "ce2.rar";//客户端保存的文件名76        string filePath = Server.MapPath("keji.rar");//路径7778        //以字符流的形式下载文件79        FileStream fs = new FileStream(filePath, FileMode.Open);80        byte[] bytes = new byte[(int)fs.Length];81        fs.Read(bytes, 0, bytes.Length);82        fs.Close();83        Response.ContentType = "application/octet-stream";84        //通知浏览器下载文件而不是打开85        Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));86        Response.BinaryWrite(bytes);87        Response.Flush();88        Response.End();8990    }

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