ASP.NET实现中文下载

//TransmitFile实现下载
    protected
void Button1_Click(object sender, EventArgs e)

     {

        /*

          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=z.zip");

        string filename
= Server.MapPath("DownLoad/aaa.zip");

         Response.TransmitFile(filename);

     }

    //WriteFile实现下载
    protected
void Button2_Click(object sender, EventArgs e)

     {

        /*

          using System.IO;

        

         */

        string fileName
="aaa.zip";//客户端保存的文件名
        string filePath=Server.MapPath("DownLoad/aaa.zip");//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.zip";//客户端保存的文件名
        string filePath
= Server.MapPath("DownLoad/aaa.zip");//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.zip";//客户端保存的文件名
        string filePath
= Server.MapPath("DownLoad/aaa.zip");//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();

     }