asp.net Cookie的用法实例

    #region cookie操作
    /// <summary>
    /// 读取cookie
    /// </summary>
    /// <param name="strName"></param>
    /// <returns></returns>
    public static string GetCookie(string keys)
    {
        HttpCookie cookie = HttpContext.Current.Request.Cookies["domain"];
        if (cookie != null)
        {
            return cookie.Values[keys].ToString();
        }
        else
        {
            return null;
        }
    }
    /// <summary>
    /// 为cookie赋值
    /// </summary>
    /// <param name="strNameTag"></param>
    /// <param name="strValue"></param>
    public static void GetCookie(string keys, string values)
    {
        if (HttpContext.Current.Request.Cookies["domain"] == null)
        {
            HttpCookie cookies = new HttpCookie("domain");//定义cookie对象
            cookies.Values[keys] = values;
            DateTime dts = DateTime.Now;//定义时间对象
            TimeSpan ts = new TimeSpan(0, 0, 20, 0);//cookie有效作用时间
            cookies.Expires = dts.Add(ts);//添加作用时间
            HttpContext.Current.Response.Cookies.Add(cookies);
        }
        else
        {
            HttpCookie cookies = HttpContext.Current.Request.Cookies["domain"];
            cookies.Values[keys] = values;
            DateTime dts = DateTime.Now;//定义时间对象
            TimeSpan ts = new TimeSpan(0, 0, 20, 0);//cookie有效作用时间，具体查msdn
            cookies.Expires = dts.Add(ts);//添加作用时间
            HttpContext.Current.Response.Cookies.Add(cookies);
        }
    }
    /// <summary>
    /// 清除cookies
    /// </summary>
    public static void clearCookie()
    {
        if (HttpContext.Current.Request.Cookies["domain"] != null)
        {
            HttpCookie cookies = HttpContext.Current.Request.Cookies["domain"];
            cookies.Values.Clear();
            DateTime dts = DateTime.Now;//定义时间对象
            TimeSpan ts = new TimeSpan(0, 0, 0, 0);//cookie有效作用时间
            cookies.Expires = dts.Add(ts);//添加作用时间
            HttpContext.Current.Response.Cookies.Add(cookies);
        }
    }
    #endregion