获取url的文件名（动态改变css）

 /// <summary>
    ///Css 的摘要说明
    /// </summary>
    public class Css
    {
        string cssAStr = "";
        string cssBStr = "";
        string defaultCssStr = "";

        /// <summary>
        /// 样式切换函数
        /// </summary>
        /// <param name="cssA"></param>
        /// <param name="cssB"></param>
        /// <param name="defaultCss"></param>
        public Css(string cssA, string cssB, string defaultCss)
        {
            cssAStr = cssA;
            cssBStr = cssB;
            defaultCssStr = defaultCss;
        }

        /// <summary>
        /// 样式切换函数
        /// </summary>
        /// <param name="cssA"></param>
        /// <param name="cssB"></param>
        public Css(string cssA, string cssB)
        {
            cssAStr = cssA;
            cssBStr = cssB;
            defaultCssStr = "";
        }

        /// <summary>
        /// 获取匹配样式
        /// </summary>
        /// <param name="value">标准值</param>
        /// <param name="key">比较值</param>
        /// <returns>筛选字符串</returns>
        public string GetCssStr(string value, string key)
        {
            string returnValue = "";
            List<string> valueList = new List<string>();
            List<string> keyList = new List<string>();
            foreach (string s in value.Split(new char[] { '|' }))
            {
                valueList.Add(s.ToLower());
            }
            bool flag = false;
            foreach (string s in key.Split(new char[] { '|' }))
            {
                if (valueList.Contains(s.ToLower()))
                {
                    flag = true;
                    break;
                }
            }

            if (flag)
            {
                returnValue = cssAStr;
                // HttpContext.Current.Response.Write(cssAStr);
            }
            else
            {
                returnValue = cssBStr;
                //HttpContext.Current.Response.Write(cssBStr);
            }
            return returnValue;
        }

        /// <summary>
        /// 获文件名
        /// </summary>
        /// <returns>获取文件名</returns>
        public string GetFileName()
        {
            return System.IO.Path.GetFileName(HttpContext.Current.Request.PhysicalPath);
        }

        /// <summary>
        /// 获取不带扩展名的文件名
        /// </summary>
        /// <returns>获取文件名（不需要扩展名）</returns>
        public string GetFileNameWithoutExt()
        {
            return System.IO.Path.GetFileName(HttpContext.Current.Request.PhysicalPath).Split('.')[0];
        }
    }

在  masterpage中初始化   protected Css itemCss = new Css("class=\"liston\"", "");

  <ul>
                        <li <%=itemCss.GetCssStr("MyCart",itemCss.GetFileNameWithoutExt())%> onmouseover="this.className='liston'"
                            onmouseout="this.className='listoff'">
                            <a href="MyCart.aspx">
                                <img src="../themes/user/img/list.gif" hspace="20" />我的购物车</a></li>
                        <li <%=itemCss.GetCssStr("OrderAll|OrderConfirm|ProductComment|CompanyComment|Comment",itemCss.GetFileNameWithoutExt())%>
                            onmouseover="this.className='liston'" onmouseout="this.className='listoff'">
                            <a href="OrderAll.aspx">
                                <img src="../themes/user/img/list.gif" hspace="20" />我的订单</a></li>
                        <li <%=itemCss.GetCssStr("MyCart",itemCss.GetFileNameWithoutExt())%> onmouseover="this.className='liston'"
                            onmouseout="this.className='listoff'">
                            <a href="temporary.aspx">
                                <img src="../themes/user/img/list.gif" hspace="20" />暂存架</a></li>
                        <li <%=itemCss.GetCssStr("ShopCollection",itemCss.GetFileNameWithoutExt())%> onmouseover="this.className='liston'"
                            onmouseout="this.className='listoff'">
                            <a href="ShopCollection.aspx">
                                <img src="../themes/user/img/list.gif" hspace="20" />商家收藏</a></li>
                        <li <%=itemCss.GetCssStr("MyCommentContent|MyCompanyComment|MyProductComment",itemCss.GetFileNameWithoutExt())%>
                            onmouseover="this.className='liston'" onmouseout="this.className='listoff'">
                            <a href="MyProductComment.aspx">
                                <img src="../themes/user/img/list.gif" hspace="20" />我的评论</a></li>
                    </ul>