C#中将xml文件反序列化为实例时采用基类还是派生类的知识点讨论

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DeserializeTest{ public class SettingsBase { private string m_fileName; public string FileName  {  get { return m_fileName; }  set { m_fileName = value; } }   }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DeserializeTest{ public class WorldWindSettings : SettingsBase {  public WorldWindSettings()   : base()  {  }  private string m_proxyUrl = "";  public string ProxyUrl  {   get   {    return m_proxyUrl;   }   set   {    this.m_proxyUrl = value;   }  } }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Xml.Serialization;namespace DeserializeTest{ class Program {  static void Main(string[] args)  {   //测试1：测试将xml文件反序列化为基类实例。测试通过。只要xml文件的根节点的名字与被反序列化的类的名字一致即可   string fileNameBase = @"D:/MyProject/DeserializeTest/DeserializeTest/bin/Debug/GobalConfig/SettingsBase.xml";   SettingsBase settingsBase;   XmlSerializer serBase = new XmlSerializer(typeof(SettingsBase));   using (TextReader trBase = new StreamReader(fileNameBase))   {    settingsBase = (SettingsBase)serBase.Deserialize(trBase);    settingsBase.FileName = fileNameBase;   }   //测试2：测试将xml文件反序列化为子类实例。测试通过。只要xml文件的根节点的名字与被反序列化的类的名字一致即可。当然了，用基类的实例引用去指向反序列化后的派生类的实例也是没问题的。   string fileName = @"D:/MyProject/DeserializeTest/DeserializeTest/bin/Debug/GobalConfig/WorldWind.xml";   SettingsBase settings;//当前了此处定义为WorldWindSettings settings;也没问题   Type type = typeof(WorldWindSettings);//因为xml文件的根节点名称是WorldWindSettings，此处只能为WorldWindSettings，而不能为SettingsBase   XmlSerializer ser = new XmlSerializer(type);   using (TextReader tr = new StreamReader(fileName))   {    //settings = (WorldWindSettings)ser.Deserialize(tr);//这两句代码都可以通过！    settings = (SettingsBase)ser.Deserialize(tr);    settings.FileName = fileName;   }   System.Console.WriteLine("Hello");  } }}

<?xml version="1.0" encoding="utf-8"?><SettingsBase> <FileName>WorldWind.xml</FileName></SettingsBase>

<?xml version="1.0" encoding="utf-8"?><WorldWindSettings> <FileName>WorldWind.xml</FileName> <ProxyUrl>www.baidu.com</ProxyUrl></WorldWindSettings>