对象的序列化和反序列化

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Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>对象的序列化和反序列化</title></head><body> <form id="form1" runat="server"> 用户ID： <asp:TextBox ID="txtUserID" runat="server"></asp:TextBox><br /> 用户名： <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><br /> 用户生日： <asp:TextBox ID="txtAge" runat="server"></asp:TextBox><br /> <asp:Button ID="btnSerializeToCookies" runat="server" Text="序列化" OnClick="btnSerializeToCookies_Click" /> <asp:Button ID="btnDeserializeByCookies" runat="server" Text="反序列化" OnClick="btnDeserializeByCookies_Click" /><br /> <asp:Label ID="lblShow" runat="server" Width="210px"></asp:Label> </form></body></html>

Default.aspx.cs

using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;using System.Runtime.Serialization;using System.Runtime.Serialization.Formatters.Binary;namespace WebApplication1{ /* gdjlc 2009年12月14日 */ public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } //定义序列化的类时必须加上[Serializable]属性 [Serializable] public class User : IDeserializationCallback { public User(int userID, string userName, DateTime birthDay) { this.userID = userID; this.userName = userName; this.birthDay = birthDay; } private int userID; private string userName; private DateTime birthDay; [NonSerialized] private int age; //年龄依赖于生日，不参与序列化 /// <summary> /// 用户ID /// </summary> public int UserID { get { return userID; } set { userID = value; } } /// <summary> /// 用户名 /// </summary> public string UserName { get { return userName; } set { userName = value; } } /// <summary> /// 生日 /// </summary> public DateTime BirthDay { get { return birthDay; } set { birthDay = value; } } /// <summary> /// 年龄 /// </summary> public int Age { get { return age; } set { age = value; } } //反序列化完成时自动调用这一方法 void IDeserializationCallback.OnDeserialization(object sender) { age = DateTime.Now.Year - birthDay.Year; } } //写入Cookies protected void btnSerializeToCookies_Click(object sender, EventArgs e) { User user = new User(int.Parse(txtUserID.Text), txtUserName.Text, Convert.ToDateTime(txtAge.Text)); Response.Cookies["User"].Value = SerializeObj(user); Response.Cookies["User"].Expires = DateTime.Now.AddMinutes(30); } //从Cookies中读取 protected void btnDeserializeByCookies_Click(object sender, EventArgs e) { if (Request.Cookies["User"] != null) { User user = DeserializeObj(Request.Cookies["User"].Value); lblShow.Text = user.UserID + "-" + user.UserName + "-" + user.BirthDay + "-" + user.Age; } } // 序列化对象 public static string SerializeObj(User user) { using (MemoryStream ms = new MemoryStream()) { IFormatter formatter = new BinaryFormatter(); formatter.Serialize(ms, user); return Convert.ToBase64String(ms.ToArray()); } } // 反序列化对象 public static User DeserializeObj(string str) { byte[] buf = Convert.FromBase64String(str); using (MemoryStream ms = new MemoryStream(buf)) { IFormatter formatter = new BinaryFormatter(); User user = formatter.Deserialize(ms) as User; return user; } } }}