C# asp.net中四种文件下载方法

http://blog.csdn.net/smartsmile2012/article/details/7978312

//TransmitFile实现下载  

protected void Button1_Click(object sender, EventArgs e)  

{  

  

  

    Response.ContentType = "application/x-zip-compressed";  

    Response.AddHeader("Content-Disposition", "attachment;filename=8月份报表.zip");  

    string filename = Server.MapPath("DownLoad/8月份报表.zip");  

    //指定编码 防止中文文件名乱码  

    Response.HeaderEncoding = System.Text.Encoding.GetEncoding("gb2312");  

    Response.TransmitFile(filename);  

}  

  

//WriteFile实现下载  

protected void Button2_Click(object sender, EventArgs e)  

{  

    string fileName = "asd.txt";//客户端保存的文件名  

    string filePath = Server.MapPath("DownLoad/aaa.txt");//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();  

}  

  

//WriteFile分块下载  

protected void Button3_Click(object sender, EventArgs e)  

{  

  

    string fileName = "aaa.txt";//客户端保存的文件名  

    string filePath = Server.MapPath("DownLoad/aaa.txt");//路径  

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

    if (fileInfo.Exists == true)  

    {  

        const long ChunkSize = 102400;//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();  

    }  

}  

  

//流方式下载  

protected void Button4_Click(object sender, EventArgs e)  

{  

    string fileName = "aaa.txt";//客户端保存的文件名  

    string filePath = Server.MapPath("DownLoad/aaa.txt");//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();  

}