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只需要在Global.asax加上几行代码就行了,我们是通过捕获用户的请求,然后通过RewritePath来实现的:
这是我程序中的一段代码,它就负责把上面的那些请求转化为真正的页面请求,
我们是通过正则表达式来区分各种类别的请求的:

protected void Application_BeginRequest(Object sender, EventArgs e)
        {                                                                        
            string url = Request.Url.AbsoluteUri ;
            string strMatch = @"http://www\.2shoushichang\.com/([^/]+)/" ;
                        
            string newUrl = "" ;
            string strCmd = SplitInfo(url,strMatch) ;
            if (strCmd != null)
            {
                switch(strCmd.ToLower())
                {

                    case "product":
                        strMatch = @"/product/(\d+)\.aspx" ;
                        string strProductId = SplitInfo(url,strMatch) ;
                                                
                        if (strProductId != null)
                        {
                            newUrl = string.Format("..\\Product.aspx?id={0}",strProductId) ;
                            this.Context.RewritePath(newUrl) ;        
                        }
                        break ;
                                
                    case "midtype"://s-100100-All-2.aspx
                        strMatch = @"/midtype/(\S+-\d+-\S+-\d+)\.aspx" ;
                        string strResult = SplitInfo(url,strMatch) ;
                                                
                        if (strResult != null)
                        {
                            string[] strParam = strResult.Split('-') ;//MidtypeList.aspx?id=100100&city=威海&type=s&Page=3
                            if (strParam.Length != 4)
                                break ;
                            string city = AppGlobal.GetCityNameByCode(strParam[2]) ;
                            newUrl = string.Format("..\\MidtypeList.aspx?type={0}&id={1}&city={2}&page={3}",strParam[0],strParam[1],city,strParam[3]) ;
                            this.Context.RewritePath(newUrl) ;        
                        }
                        break ;                                        
                    case "其它处理":
                        break;
                    default:
                        break ;
                }

            }                        
        }