4种 ASP.NET文件下载

Description:

4种ASP.NET文件下载

//TransmitFile实现下载
    protectedvoid Button1_Click(object sender, EventArgs e)
    {
       

       Response.ContentType = "application/x-zip-compressed";
       Response.AddHeader("Content-Disposition","attachment;filename=z.zip");
       string filename = Server.MapPath("DownLoad/z.zip");
       Response.TransmitFile(filename);
    }

   //WriteFile实现下载
    protectedvoid 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
    protectedvoid 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 = newSystem.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
    protectedvoid 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();

   }