using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Web;namespace System.CRM.Common{    /// 
    /// Cookie操作助手类    /// 
    public class CookieHelper    {        /// 
        /// 设置一个Cookie（一天超时）        /// 
        /// Cookie的Key值        /// Cookie的Value值        public static void SetCookie(string key, string value)        {            SetCookie(HttpContext.Current.Response, key, value, DateTime.Now.AddDays(1));        }        /// 
        /// 设置一个Cookie        /// 
        /// Cookie的Key值        /// Cookie的Value值        /// Cookie的超时时间        public static void SetCookie(string key, string value, DateTime expires)        {            SetCookie(HttpContext.Current.Response, key, value, expires);        }        /// 
        /// 移除Cookie        /// 
        /// Cookie的Key值        public static void RemoveCookie(string key)        {            SetCookie(HttpContext.Current.Response, key, null, DateTime.Now.AddMinutes(-1));        }        /// 
        /// 获取Cookie值（查）        /// 
        /// Cookie的Key值        /// 
     
      Cookie的Value值
             public static string GetCookie(string key)        {            return GetCookie(HttpContext.Current.Request, key);        }        /// 
        /// 设置一个Cookie（增删改）        /// 
        /// 当前 HTTP 响应的 System.Web.HttpResponse 对象        /// Cookie的Key值        /// Cookie的Value值        /// Cookie的超时时间        private static void SetCookie(HttpResponse response, string key, string value, DateTime expires)        {            HttpCookie cookie = new HttpCookie(key)            {                Value = value,                Expires = expires            };            response.Cookies.Add(cookie);        }        /// 
        /// 获取Cookie值（查）        /// 
        /// 当前 HTTP 请求的 System.Web.HttpRequest 对象        /// Cookie的Key值        /// 
     
      Cookie的Value值
             private static string GetCookie(HttpRequest request, string key)        {            HttpCookie cookie = request.Cookies[key];            return cookie != null ? cookie.Value : null;        }    }}