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asp教程.net xls 文件下载功能实例
提供二款asp.net教程 c文件下载实例代码，如果你直接连接xls文件，会在浏览器打开，现在我们利用.net来实例点击下载。
*/

private void page_load(object sender, system.eventargs e)
{
    if(!page.ispostback)
    {
        string filepath = "d:www.111cn.net.xls";
    //    filepath = "d:test.xls";
        system.io.filestream fs = system.io.file.openread( filepath );
        byte[] filedata = new byte[fs.length];
        fs.read( filedata, 0, (int)(fs.length) );
        fs.close();

        response.addheader( "content-type", "application/vnd.ms-excel" );
       
        string saveasfilename = "yoursaveasfilename";
        saveasfilename = encode(saveasfilename);
            //saveasfilename = httputility.urldecode(saveasfilename, system.text.encoding.getencoding("shift-jis"));
        response.addheader("content-disposition", "inline;filename=" + saveasfilename);

        response.addheader("content-length", filedata.length.tostring() );
        response.binarywrite( filedata );               
        response.end();
    }
}

//方法二

 public static void downloadfile( string filepath )
        {
            string str = httpcontext.current.request.servervariables[ "appl_physical_path" ];
            string path = str + "www.111cn.net" + filepath;
            fileinfo file = new fileinfo( path );
            httpcontext.current.response.contentencoding = system.text.encoding.getencoding( "utf-8" ); //解决中文乱码
            httpcontext.current.response.addheader( "content-disposition", "attachment; filename=" + httpcontext.current.server.urlencode( file.name ) ); //解决中文文件名乱码   
            httpcontext.current.response.addheader( "content-length", file.length.tostring() );
            httpcontext.current.response.contenttype = "appliction/octet-stream";
            httpcontext.current.response.writefile( file.fullname );
            httpcontext.current.response.end();
        }

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