系统Cookie相关读取操作

/// <summary>    /// 系统Cookie相关读取操作    /// </summary>    public class CookieManager    {        #region 构造函数        /// <summary>        /// 构造函数         /// </summary>        public CookieManager()        {        }        #endregion        #region 获取Cookie        /// <summary>         /// 获得Cookie的值         /// </summary>         /// <param name="cookieName"></param>         /// <returns></returns>         public static string GetCookieValue(string cookieName)        {            HttpRequest request = HttpContext.Current.Request;            if (request != null)                return GetCookieValue(request.Cookies[cookieName]);            return "";        }        /// <summary>         /// 获得Cookie的值         /// </summary>         /// <param name="cookie"></param>         /// <returns></returns>         public static string GetCookieValue(HttpCookie cookie)        {            if (cookie != null)            {                return cookie.Value;            }            return "";        }        /// <summary>         /// 获得Cookie         /// </summary>         /// <param name="cookieName"></param>         /// <returns></returns>         public static HttpCookie GetCookie(string cookieName)        {            HttpRequest request = HttpContext.Current.Request;            if (request != null)                return request.Cookies[cookieName];            return null;        }        #endregion        #region 删除Cookie        /// <summary>         /// 删除Cookie        /// </summary>         /// <param name="cookieName"></param>         public static void RemoveCookie(string cookieName)        {            HttpResponse response = HttpContext.Current.Response;            if (response != null)            {                HttpCookie cookie = response.Cookies[cookieName];                if (cookie != null)                {                    response.Cookies.Remove(cookieName);                }            }        }        #endregion        #region 设置/修改Cookie        /// <summary>         /// 设置Cookie         /// </summary>         /// <param name="cookieName"></param>         /// <param name="key"></param>         /// <param name="value"></param>         /// <param name="expires"></param>         public static void SetCookie(string cookieName, string value, DateTime? expires)        {            //Guard.IsNotNullOrEmpty(cookieName, "cookieName");             HttpResponse response = HttpContext.Current.Response;            if (response != null)            {                HttpCookie cookie = response.Cookies[cookieName];                if (cookie != null)                {                    cookie.Value = value;                    if (expires != null)                        cookie.Expires = expires.Value;                    response.SetCookie(cookie);                }            }        }        #endregion        #region 添加Cookie        /// <summary>         /// 添加为Cookie.Values集合         /// </summary>         /// <param name="cookieName">Cookie名称</param>         /// <param name="value">值</param>         /// <param name="expires">保存天数</param>         public static void AddCookie(string cookieName, string value, int expires)        {            HttpCookie cookie = GetCookie(cookieName);            if (cookie != null)            {                DateTime dt = DateTime.Now;                TimeSpan ts = new TimeSpan(expires, 0, 0, 20);                cookie.Expires = dt.Add(ts);                cookie.Value = value;            }            else            {                cookie = new HttpCookie(cookieName);                DateTime dt = DateTime.Now;                TimeSpan ts = new TimeSpan(expires, 0, 0, 20);                cookie.Value = value;                cookie.Expires = dt.Add(ts);            }            AddCookie(cookie);        }        /// <summary>         /// 添加Cookie         /// </summary>         /// <param name="cookie"></param>         public static void AddCookie(HttpCookie cookie)        {            HttpResponse response = HttpContext.Current.Response;            if (response != null)            {                //指定客户端脚本是否可以访问[默认为false]                 cookie.HttpOnly = true;                //指定统一的Path，比便能通存通取                 cookie.Path = "/";                //设置跨域,这样在其它二级域名下就都可以访问到了                 //cookie.Domain = "nas.com";                 response.AppendCookie(cookie);            }        }        #endregion    }