C#自定义序列化ISerializable的实现方法

[Serializable]
public class BaseObject
{
  [OptionalField]
  private string _str = "I am BaseObject";
}
[Serializable]
public class TestObject : BaseObject, ISerializable
{
  int a;
  string strName = "";
  Color c = Color.Red;
  DataTable _dtColors = null;
  [OptionalField]
  ArrayList list = new ArrayList();
  [OptionalField]
  List<int> list1 = new List<int>();
  [OptionalField]
  Dictionary<int, string> dic = new Dictionary<int, string>();
  //当实现ISerializable接口时，如果该构造函数不存在，则会引发一个SerializationException异常
  //该特性表示，该方法只允许序列化器调
  [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
  protected TestObject(SerializationInfo info, StreamingContext context)
  {
   #region 如果基类也实现了ISerializable接口，则序列化器会自动调用基类的该构造函数，就不需要本段代码
   Type basetype = this.GetType().BaseType;
   MemberInfo[] mi = FormatterServices.GetSerializableMembers(basetype, context);
   for (int i = 0; i < mi.Length; i++)
   {
    //由于AddValue不能添加重名值，为了避免子类变量名与基类变量名相同，将基类序列化的变量名加上基类类名
    FieldInfo fi = (FieldInfo)mi[0];
    object objValue = info.GetValue(basetype.FullName + "+" + fi.Name, fi.FieldType);
    fi.SetValue(this, objValue);
   }
   #endregion
   a = info.GetInt32("a");
   strName = info.GetString("strName");
   c = (Color)info.GetValue("c", typeof(Color));
   _dtColors = (DataTable)info.GetValue("_dtColors", typeof(DataTable));
   list = (ArrayList)info.GetValue("list", typeof(ArrayList));
   list1 = (List<int>)info.GetValue("list1", typeof(List<int>));
   dic = (Dictionary<int, string>)info.GetValue("dic", typeof(Dictionary<int, string>));
  }
  public TestObject()
  {
   a = 100;
   strName = "daps";
   InitColorTable();
   list1.Add(10);
   list1.Add(20);  
  }
  #region ISerializable 成员
  [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter =true)]
  void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
  {
   info.AddValue("a", a);
   info.AddValue("strName", strName);
   info.AddValue("c", c);
   info.AddValue("_dtColors", _dtColors);
   info.AddValue("list", list);
   info.AddValue("list1", list1);
   info.AddValue("dic", dic);
   Type basetype = this.GetType().BaseType;
   MemberInfo[] mi = FormatterServices.GetSerializableMembers(basetype, context);
   for (int i = 0; i < mi.Length; i++)
   {
    //由于AddValue不能添加重名值，为了避免子类变量名与基类变量名相同，将基类序列化的变量名加上基类类名
    info.AddValue(basetype.FullName + "+" + mi[i].Name, ((FieldInfo)mi[i]).GetValue(this));
   }
  }
  #endregion
}