Asp.net 的cookie问题

写代码的发现的小问题

如果写入cookie的时候指定了domin域名

那么删除的时候必须也指定domin域名才行，即使你先读取了这个已经存在的cookie，但是还是要指定domin才能删除

 /// <summary>
        /// 删除指定Cookie
        /// </summary>
        /// <param name="cookieName"></param>
        public static void RemoveCookie(string cookieName)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];// new HttpCookie(cookieName);

            if (cookie != null)
            {
                //httpContext.Current.Request.Cookies.Remove(cookieName);
                cookie.Expires = DateTime.Now.AddDays(-1);
                cookie.Domain = ".xxxx.com";
                HttpContext.Current.Response.SetCookie(cookie);
            }
        }