对象序列化及反序列化

序列化是指将对象实例的状态存储到存储媒体的过程。在此过程中，先将对象的公共字段和私有字段以及类的名称（包括类所在的程序集）转换为字节流，然后再把字节流写入数据流。在随后对对象进行反序列化时，将创建出与原对象完全相同的副本。

如果需要将对象保存在页面ViewState中，即需要将类实现序列化，将对象从ViewState中取出，需要将对象反序列化。

using System;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace BTTech.WebModules.WebMail
{
    /**//// <summary>
    /// WebMailAccount 帐号对象。
    /// </summary>
    [Serializable]
    public class WebMailAccount: Object ,ISerializable
    {
        private int account_id;
        public int Account_ID
        {
            get {return account_id;}
        }
        private string user_id;
        public string User_ID
        {
            get {return user_id;}
        }
        private string email;
        public string Email
        {
            get {return email;}
        }
        private string popserver;
        public string PopServer
        {
            get {return popserver;}
        }
        private string smtpserver;
        public string SmtpServer
        {
            get {return smtpserver;}
        }
        private LoginType logintype;
        public LoginType Logintype
        {
            get {return logintype;}
        }
        private bool needpass;
        public bool Needpass
        {
            get {return needpass;}
        }
        public WebMailAccount(int account_id, string user_id, string email, string popserver, string smtpserver,
            LoginType logintype, bool needpass)
        {
            this.account_id = account_id;
            this.user_id = user_id;
            this.email = email;
            this.popserver = popserver;
            this.smtpserver = smtpserver;
            this.logintype = logintype;
            this.needpass = needpass;
        }

        /**//// <summary>
        /// Smtp登陆类型
        /// </summary>
        public enum LoginType
        {
            /**//// <summary>
            /// 登陆只需用户名
            /// </summary>
            UserNameOnly = 1,
            /**//// <summary>
            /// 登陆需要用户名和域名
            /// </summary>
            UserNameandDomain = 2,
        }
        

        /**//// <summary>
        /// 序列化
        /// </summary>
        /// <param name="info"></param>
        /// <param name="context"></param>
        void  ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue("AccountID",account_id);
            info.AddValue("User_ID",user_id);
            info.AddValue("Email",email);
            info.AddValue("PopServer",popserver);
            info.AddValue("SmtpServer",smtpserver);
            info.AddValue("LoginType",(int)logintype);
            info.AddValue("NeedPass",needpass);
        }

        /**//// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="info"></param>
        /// <param name="context"></param>
        protected WebMailAccount(SerializationInfo info, StreamingContext context)
        {
            account_id    = info.GetInt32("AccountID");
            user_id        = info.GetString("User_ID");
            email        = info.GetString("Email");
            popserver    = info.GetString("PopServer");
            smtpserver    = info.GetString("SmtpServer");
            logintype    = (LoginType)(info.GetInt32("LoginType"));
            needpass    = info.GetBoolean("NeedPass");
        }
    }
}