前台：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="../../Lib/jquery.js"></script>
<script>
$(document).ready(function ()
{
$("#Button1").click(function ()
{
location.href = 'Web7.ashx'
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Button1" type="button" value="下载" />
</div>
</form>
</body>
</html>
一般处理程序
string s_fileName = "交代事项需求.docx";
HttpContext.Current.Response.ContentType = "application/ms-download";
string s_path = HttpContext.Current.Server.MapPath( s_fileName ) ;
System.IO.FileInfo file = new System.IO.FileInfo( s_path );
HttpContext.Current.Response.Clear( );
HttpContext.Current.Response.AddHeader( "Content-Type" , "application/octet-stream" );
HttpContext.Current.Response.Charset = "utf-8";
HttpContext.Current.Response.AddHeader( "Content-Disposition" , "attachment;filename="
+ System.Web.HttpUtility.UrlEncode("abc.docx" , System.Text.Encoding.UTF8 ) );
HttpContext.Current.Response.AddHeader( "Content-Length" , file.Length.ToString( ) );
HttpContext.Current.Response.WriteFile( file.FullName );
HttpContext.Current.Response.Flush( );
HttpContext.Current.Response.Clear( );
HttpContext.Current.Response.End( );