asp.net 页面url重写

using System;
using System .Collections . Generic;
using System .Linq;
using System .Text;
using System .Threading . Tasks;

namespace HttpModule
{
    using System. Web;
    using System. Text .RegularExpressions;
    public class UrlRewriterFilter :IHttpModule
    {
        public void Dispose()
        {
            throw new NotImplementedException ();
        }

        /// <summary>
        /// 负责在第一个管道事件上注册一个重写 index/1的url为 index.aspx?id=1
        /// </summary>
        /// <param name= "context" ></param>
        public void Init( HttpApplication context)
        {
            context . BeginRequest+= context_BeginRequest;
        }

        void context_BeginRequest( object sender, EventArgs e)
        {
            //01.获取当前请求的原始url  index/1
            string url = HttpContext. Current .Request . RawUrl;
            //02.将当前url重写
            // 定义一个正则表达式来检查当前发送过来的url 是否为我要重写的index页面路径
            Regex reg = new Regex ("/index/(.*)" );
            if (reg. IsMatch(url))
            {
                string newUrl = reg .Replace(url, "/index.aspx?id=$1" );
                HttpContext .Current . RewritePath(newUrl);
            }
        }
    }
}