Cookie 获取

二级域名可以获取一级域名的Cookie值

二级域名下删除顶级域名下的Cookie，需要添加顶级域名的Cookie作用域

 /// <summary>
        /// 根据cookie名称删除
        /// </summary>
        /// <param name="cookieName"></param>
        public void ExpireCookie(string cookieName)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
            if (cookie != null)
            {
                cookie.Expires = DateTime.Now.AddDays(-2);
                cookie.Domain = ".xilu.com";
                HttpContext.Current.Response.Cookies.Set(cookie);

            }
            //FileAddEveryDay(path, "根据cookie名称删除:" + cookieName, true);
            //HttpContext.Current.Response.Cookies.Remove(cookieName);
        }