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)
  {
   //測(cè)試1：測(cè)試將xml文件反序列化為基類實(shí)例。測(cè)試通過。只要xml文件的根節(jié)點(diǎn)的名字與被反序列化的類的名字一致即可
   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;
   }

   //測(cè)試2：測(cè)試將xml文件反序列化為子類實(shí)例。測(cè)試通過。只要xml文件的根節(jié)點(diǎn)的名字與被反序列化的類的名字一致即可。當(dāng)然了，用基類的實(shí)例引用去指向反序列化后的派生類的實(shí)例也是沒問題的。
   string fileName = @"D:\MyProject\DeserializeTest\DeserializeTest\bin\Debug\GobalConfig\WorldWind.xml";
   SettingsBase settings;//當(dāng)前了此處定義為WorldWindSettings settings;也沒問題
   Type type = typeof(WorldWindSettings);//因?yàn)閤ml文件的根節(jié)點(diǎn)名稱是WorldWindSettings，此處只能為WorldWindSettings，而不能為SettingsBase
   XmlSerializer ser = new XmlSerializer(type);
   using (TextReader tr = new StreamReader(fileName))
   {
    //settings = (WorldWindSettings)ser.Deserialize(tr);//這兩句代碼都可以通過！
    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>