unity3d xml序列化

using UnityEngine;   
using System.Collections;   
using System.Xml;   
using System.Xml.Serialization;   
using System.IO;   
using System.Text;   
   
public class Reward    
 {   
   public Task task;   
   public Attribute attribute;   
   public Reward () {}   
   public struct Task  
   {   
      [XmlAttribute("taskNo")]   
      public int taskNo{ get; set;}   
      [XmlAttribute("taskReward")]   
      public int taskReward{ get; set;}   
      public Id id1;  
      public Id id2;  
           public Id id3;  
   }  
   public struct Id  
   {  
      [XmlAttribute("flag")]   
      public bool flag{ get; set;}   
      [XmlAttribute("name")]   
      public string name{ get; set;}  
   }  
}  
  
public class AchievementManager: MonoBehaviour {   
   Reward reward ;   
   FileInfo t ;  
   string _data;      
   void Start ()   
   {      
    reward = new Reward();  
   t = new FileInfo(Application.dataPath+"\"+ "Achievement.xml");   
   LoadXML();  
   reward.task.id1.name = "杨纯/nate";  
   reward.task.id2.name = "有点笨";  
   reward.task.id3.name = "dlnuchunge";  
   Save();  
   }   
   
   void LoadXML()   
   {   
      if(t.Exists)   
      {   
          StreamReader r = t.OpenText();   
          string _info = r.ReadToEnd();   
          r.Close();   
          _data=_info;   
          if(_data.ToString() != "")   
          {   
            reward = (Reward)DeserializeObject(_data);                
          }   
      }             
   }   
   public void Save()  
   {       
      _data = SerializeObject(reward);   
      StreamWriter writer;   
      if(t.Exists)   
      {   
         t.Delete();    
      }      
      writer = t.CreateText();   
      writer.Write(_data);   
      writer.Close();   
   }     
   string UTF8ByteArrayToString(byte[] characters)   
   {        
      UTF8Encoding encoding = new UTF8Encoding();   
      string constructedString = encoding.GetString(characters);   
      return (constructedString);   
   }   
   
   byte[] StringToUTF8ByteArray(string pXmlString)   
   {   
      UTF8Encoding encoding = new UTF8Encoding();   
      byte[] byteArray = encoding.GetBytes(pXmlString);   
      return byteArray;   
   }   
   
   // Here we serialize our Reward object of reward   
   string SerializeObject(object pObject)   
   {  
      string XmlizedString = null;   
      MemoryStream memoryStream = new MemoryStream();   
      XmlSerializer xs = new XmlSerializer(typeof(Reward));   
      XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);   
      xs.Serialize(xmlTextWriter, pObject);   
      memoryStream = (MemoryStream)xmlTextWriter.BaseStream;   
      XmlizedString = UTF8ByteArrayToString(memoryStream.ToArray());   
      return XmlizedString;   
   }   
   
   // Here we deserialize it back into its original form   
   object DeserializeObject(string pXmlizedString)   
   {   
      XmlSerializer xs = new XmlSerializer(typeof(Reward));   
      MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(pXmlizedString));   
      XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);   
      return xs.Deserialize(memoryStream);   
   }   
}