CookieHelper

    using System;
    using System.Web; 
 
    public static class CookieHelper
    {
        /// <summary>
        /// 添加cookie
        /// </summary>
        public static void AddCookie(this HttpContext h,string name, string value)
        {
            HttpCookie cookieName = new HttpCookie(name, System.Web.HttpUtility.UrlEncode(value, System.Text.Encoding.GetEncoding(65001)));
            h.Response.Cookies.Add(cookieName);
        }
 
        /// <summary>
        /// 添加cookie
        /// </summary>
        public static void AddCookie(this HttpContext h,string name, string value, TimeSpan span)
        {
            HttpCookie cookieName = new HttpCookie(name, System.Web.HttpUtility.UrlEncode(value, System.Text.Encoding.GetEncoding(65001)));
 
            cookieName.Expires = DateTime.Now.Add(span);
 
            h.Response.Cookies.Add(cookieName);
        }
 
        /// <summary>
        /// 得到cookie
        /// </summary>
        public static string GetCookie(this HttpContext h, string name)
        {
            if (h.Request.Cookies[name] != null)
            {
                if (h.Response.Cookies.Count > 0 && h.Response.Cookies[name] != null)
                {
                    return System.Web.HttpUtility.UrlDecode(h.Response.Cookies[name].Value, System.Text.Encoding.GetEncoding(65001));
                }
                return System.Web.HttpUtility.UrlDecode(h.Request.Cookies[name].Value, System.Text.Encoding.GetEncoding(65001));
            }
            else
            { return string.Empty; }
        }
 
        /// <summary>
        /// 删除cookie
        /// </summary>
        public static void RemoveCookie(this HttpContext h,string name)
        {
            h.Response.Cookies[name].Value = null;
            h.Response.Cookies[name].Expires = DateTime.Now.AddDays(-1);
        }
 
        /// <summary>
        /// 清空cookie
        /// </summary>
        public static void ClearCookie(this HttpContext h)
        {
            try
            {
                foreach (HttpCookie hc in h.Response.Cookies)
                {
                    hc.Value = null;
                    hc.Expires = DateTime.Now.AddDays(-1);
                }
            }
            catch { }
        }
    }