.net 下载图片.word,

 protected void GetDownload(string xlfile)
    {
        string path = Server.MapPath(xlfile);
        System.IO.FileInfo file = new System.IO.FileInfo(path);
        Response.Clear();
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF8;
        // 添加头信息，为"文件下载/另存为"对话框指定默认文件名   
        Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(file.Name));
        // 添加头信息，指定文件大小，让浏览器能够显示下载进度   
        Response.AddHeader("Content-Length", file.Length.ToString());
        // 指定返回的是一个不能被客户端读取的流，必须被下载   
        Response.ContentType = "application/ms-excel";
        // 把文件流发送到客户端   
        Response.WriteFile(file.FullName);
        // 停止页面的执行   
        Response.End();

    }
    protected void Page_Load(object sender, EventArgs e)
    {
        GetDownload("/images/an.gif");
}