asp.net 中cookie如何用

2013-01-11

asp.net 中cookie怎么用，我想让一个文本框的内容在刷新后不变，按照网上的建议我试用cookie ，如下，但是

asp.net 中cookie怎么用，
我想让一个文本框的内容在刷新后不变，按照网上的建议我试用cookie ，如下，但是会报一个错， System.Web.HttpResponse不包含cookie定义，是不是缺少引用，？？
Response.Cookie("username").value="aa"
username=Request.Cookies("username").value


   public static void SetCookie()
        {
            string CookieName = username; //car name
            int CarCookieExpires = 30; //Expires
            Response.Cookies.Add(new HttpCookie(CookieName,"aa"));
            Response.Cookies[CookieName].Expires = DateTime.Now.AddDays(CarCookieExpires); //保存1月
        }

[解决办法]

引用:

引用:C# code?1234567 public static void SetCookie(HttpResponseBase Response,string CarValue) { string CookieName = username; //car name ……

你那写的是什么哦，照着这样做没错
[解决办法]
写一个普通类

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

namespace YDSystem.ZXF.Common
{
    /// <summary>
    ///Cookie操作基类
    /// </summary>
    public abstract class Cookies :System.Web.UI.Page
    {
        /// <summary>
        ///获取cookie值
        /// </summary>
        /// <param name="cookieName">cookie名</param>
        public static string GetCookieValue (string cookieName)
        {
          string cookieVal = String.Empty;
            cookieVal = HttpContext.Current.Request.Cookies[cookieName].Value;
           return cookieVal;
        }

        /// <summary>
        /// 创建cookie
        /// </summary>
        /// <param name="cookieName">名字</param>
        /// <param name="expirationDays">cookie有效时间(以天计)</param>
        /// <param name="value">cookie值</param>
        public static void CreateCookie (string cookieName, string value, int? expirationDays)
        {
            HttpCookie Cookie = new HttpCookie(cookieName, value);
             if ( expirationDays.HasValue )
                Cookie.Expires = DateTime.Now.AddDays(expirationDays.Value );
             HttpContext.Current.Response.Cookies.Add(Cookie);
        }

        /// <summary>
        /// 清除指定cookie
        /// </summary>
        public static void DeleteCookie (string cookieName)

        {
            HttpCookie Cookie = HttpContext.Current.Request.Cookies[cookieName];
            if (Cookie != null)
            {
                Cookie.Expires = DateTime.Now.AddDays(-2);
                HttpContext.Current.Response.Cookies.Add(Cookie);
             }
        }

        /// <summary>
        /// 检查cookie
        /// </summary>
        public static bool CookieExists(string cookieName)
        {
            bool exists = false;
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
             if (cookie != null)
                exists = true;
            return exists;
        }

        /// <summary>
        ///获取全部cookie
        /// </summary>
        public static Dictionary<string, string> GetAllCookies()
        {
            Dictionary<string, string> cookies = new Dictionary<string, string>();
            foreach (string key in HttpContext.Current.Request.Cookies.AllKeys)
            {
                 cookies.Add(key, HttpContext.Current.Request.Cookies[key].Value);
            }
             return cookies;
        }

        /// <summary>
        ///清空cookies
        /// </summary>
        public static void DeleteAllCookies ()
        {
            var x = HttpContext.Current.Request.Cookies;
            foreach (HttpCookie cook in x)
            {
                DeleteCookie(cook.Name);

            }
        }

    }
}

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