CookieHelper cookie操作

public class CookieHelper
    {
        public static void AddCookie(object obj, string cookieName)
        {
            BinaryFormatter bf = new BinaryFormatter();  //声明一个序列化类
            MemoryStream ms = new MemoryStream();  //声明一个内存流
            bf.Serialize(ms, obj);  //执行序列化操作
            byte[] result = new byte[ms.Length];
            result = ms.ToArray();
            string temp = System.Convert.ToBase64String(result);
            /*此处为关键步骤，将得到的字节数组按照一定的编码格式转换为字符串，不然当对象包含中文时，进行反序列化操作时会产生编码错误*/
            ms.Flush();
            ms.Close();
            //string temp = XmlUtil.Serializer(obj.GetType(), obj);
            HttpCookie cookie = new HttpCookie(cookieName);  //声明一个Key为Obj的Cookie对象
            cookie.Expires = DateTime.Now.AddDays(1.0);  //设置Cookie的有效期到明天为止,此处时间可以根据需要设置
            cookie.Value = temp;  //将cookie的Value值设置为temp
            System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            curContext.Response.Cookies.Add(cookie);
        }

        public static Object ReadCookie(string cookieName)
        {
            try
            {
                System.Web.HttpContext curContext = System.Web.HttpContext.Current;
                string result = curContext.Request.Cookies[cookieName].Value;
                //return (XmlUtil.Deserialize(typeof(UserInfo), result));
                byte[] b = System.Convert.FromBase64String(result);  //将得到的字符串根据相同的编码格式分成字节数组
                MemoryStream ms = new MemoryStream(b, 0, b.Length);  //从字节数组中得到内存流
                BinaryFormatter bf = new BinaryFormatter();
                return bf.Deserialize(ms);
            }
            catch
            {
                return null;
            }
        }
        public static void DeleteCookie(string cookieName)
        {
            try
            {
                System.Web.HttpContext curContext = System.Web.HttpContext.Current;
                //HttpCookie mycookie;
                //mycookie = curContext.Request.Cookies[cookieName]; 
                //TimeSpan ts = new TimeSpan(0, 0, 0, 0);//时间跨度             
                //mycookie.Expires = DateTime.Now.Add(ts);//立即过期            
                curContext.Response.Cookies.Remove(cookieName);//清除        
            }
            catch
            {
               
            }
        }

    }