ASP.NET cookie类

Question

要求写一个cookie类实现以下功能
1.保存用户名（有个checkbook是“记住用户名”）
2.用户的自动登录（有个checkbook是“自动登录”）
3.密码进行加密很急，谢谢大家。

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Data;
using System.Configuration;
namespace Bll
{
    /// <summary> 
    /// Cookie操作类 
    /// </summary> 
    public class CookieHelper
    {
        #region 保存Cookie
        /// <summary> 
        /// 保存Cookie 
        /// </summary> 
        /// <param name="CookieName">Cookie名称</param> 
        /// <param name="CookieValue">Cookie值</param> 
        /// <param name="CookieTime">Cookie过期时间(小时),0为关闭页面失效</param> 
        public static void SaveCookie(string CookieName, object CookieValue, double CookieTime)
        {
            HttpCookie myCookie = new HttpCookie(CookieName);
            DateTime now = DateTime.Now;
            myCookie.Value = ConvertObjectToString(CookieValue);
            if (CookieTime != 0)
                myCookie.Expires = now.AddHours(CookieTime);
            if (HttpContext.Current.Response.Cookies[CookieName] != null)
                HttpContext.Current.Response.Cookies.Remove(CookieName);
            HttpContext.Current.Response.Cookies.Add(myCookie);
        }
        private static string ConvertObjectToString(object CookieValue)
        {
            BinaryFormatter bf = new BinaryFormatter();
            MemoryStream ms = new MemoryStream();
            bf.Serialize(ms, CookieValue);
            byte[] result = new byte[ms.Length];
            result = ms.ToArray();
            string temp = System.Convert.ToBase64String(result);
            ms.Flush();
            ms.Close();
            return temp;
        }
        #endregion
        #region 取得Cookie
        /// <summary> 
        /// 取得Cookie 
        /// </summary> 
        /// <param name="CookieName">Cookie名称</param> 
        /// <returns>Cookie的值</returns> 
        public static object GetCookie(string CookieName)
        {
            HttpCookie myCookie = new HttpCookie(CookieName);
            myCookie = HttpContext.Current.Request.Cookies[CookieName];
            if (myCookie != null)
                return ConvertStringToObject(myCookie.Value);
            else
                return null;
        }
        private static object ConvertStringToObject(string value)
        {
            byte[] b = System.Convert.FromBase64String(value);
            MemoryStream ms = new MemoryStream(b, 0, b.Length);
            BinaryFormatter bf = new BinaryFormatter();
            return bf.Deserialize(ms);
        }
        #endregion
        #region 清除Cookie
        /// <summary> 
        /// 清除Cookie
        /// </summary> 
        /// <param name="CookieName">Cookie名称</param> 
        public static void ClearCookie(string CookieName)
        {
            HttpCookie myCookie = new HttpCookie(CookieName);
            DateTime now = DateTime.Now;
            myCookie.Expires = now.AddYears(-2);
            HttpContext.Current.Response.Cookies.Add(myCookie);
        }
        #endregion
    }
}