CookiesHelper.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;

namespace TLibrary.ObjectHelper
{
    public class CookiesHelper { #region 獲取Cookie

        /// <summary>
        /// 得到Cookie的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <returns></returns>
        public static string GetCookieValue(string cookieName)
        {
            return GetCookieValue(cookieName, null);
        }

        /// <summary>
        /// 得到Cookie的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetCookieValue(string cookieName,string key)
        {
            HttpRequest request = HttpContext.Current.Request;
            if (request != null)
                return GetCookieValue(request.Cookies[cookieName], key);
            return "";
        }

        /// <summary>
        /// 得到Cookie的子鍵值
        /// </summary>
        /// <param name="cookie"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetCookieValue(HttpCookie cookie, string key)
        {
            if (cookie != null)
            {
                if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                    return cookie.Values[key];
                else
                    return cookie.Value;
            }
            return "";
        }

        /// <summary>
        /// 得到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 刪除Cookie

        /// <summary>
        /// 刪除Cookie
        /// </summary>
        /// <param name="cookieName"></param>
        public static void RemoveCookie(string cookieName)
        {
            RemoveCookie(cookieName,null);
        }

        /// <summary>
        /// 刪除Cookie的子鍵
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        public static void RemoveCookie(string cookieName,string key)
        {
            HttpResponse response = HttpContext.Current.Response;
            if (response != null)
            {
                HttpCookie cookie = response.Cookies[cookieName];
                if (cookie != null)
                {
                    if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Remove(key);
                    else
                        response.Cookies.Remove(cookieName);
                }
            }
        }

        #endregion

        #region 設置/修改Cookie

        /// <summary>
        /// 設置Cookie子鍵的值
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetCookie(string cookieName, string key, string value)
        {
            SetCookie(cookieName, key, value, null);
        }

        /// <summary>
        /// 設置Cookie值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetCookie(string key, string value)
        {
            SetCookie(key, null, value, null);
        }

        /// <summary>
        /// 設置Cookie值和過時時間
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void SetCookie(string key, string value, DateTime expires)
        {
            SetCookie(key, null, value, expires);
        }

        /// <summary>
        /// 設置Cookie過時時間
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="expires"></param>
        public static void SetCookie(string cookieName, DateTime expires)
        {
            SetCookie(cookieName, null, null, expires);
        }

        /// <summary>
        /// 設置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 key, string value, DateTime? expires)
        {
            HttpResponse response = HttpContext.Current.Response;
            if (response != null)
            {
                HttpCookie cookie = response.Cookies[cookieName];
                if (cookie != null)
                {
                    if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
                        cookie.Values.Set(key, value);
                    else
                        if (!string.IsNullOrEmpty(value))
                            cookie.Value = value;
                    if (expires != null)
                        cookie.Expires = expires.Value;
                    response.SetCookie(cookie);
                }
            }
           
        }

        #endregion

        #region 添加Cookie

        /// <summary>
        /// 添加Cookie
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void AddCookie(string key, string value)
        {
            AddCookie(new HttpCookie(key, value));
        }

        /// <summary>
        /// 添加Cookie
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void AddCookie(string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(key, value);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加爲Cookie.Values集合
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void AddCookie(string cookieName,string key, string value)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Values.Add(key, value);
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加爲Cookie集合
        /// </summary>
        /// <param name="cookieName">Cookie名稱</param>
        /// <param name="expires">過時時間</param>
        public static void AddCookie(string cookieName, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            AddCookie(cookie);
        }

        /// <summary>
        /// 添加爲Cookie.Values集合
        /// </summary>
        /// <param name="cookieName"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="expires"></param>
        public static void AddCookie(string cookieName, string key, string value, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookieName);
            cookie.Expires = expires;
            cookie.Values.Add(key, value);
            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)
            {
                //指定客戶端腳本是否能夠訪問[默認爲false]
                cookie.HttpOnly = true;        
                //指定統一的Path，比便能通存通取
                cookie.Path = "/";
                //設置跨域,這樣在其它二級域名下就均可以訪問到了
                //cookie.Domain = "chinesecoo.com";
                response.AppendCookie(cookie);
            }
        }

        #endregion
    }
}

代碼注意事項:
1. Cookies添加的時候注意一個Cookie能夠添加多個子鍵
2. 假如你不顯示的設置HttpCookie.Expires 那麼此cookie生命期即爲瀏覽器進程——關閉瀏覽器則過時
3. 須要瞭解HttpCookie.Domain和HttpCookie.Path這兩個屬性，對於跨域和存儲路徑等高級應用有幫助