实战 .Net 数据访问层 - 4

// MyCustomer：包含基本字段的Customer，支持数据列表，从MyDef继承

[Serializable()]

public class MyCustomer: MyDef

{

    public string Id;

    public string Name;

    public string Phone;

    public MyCustomer() { }

    public MyCustomer(ArrayList al) : base(al) { }

}

// MyDef：提供当前应用程序所需的Data Entity支持，

//   包括O/R Mapping，XML，从DefBase继承

[Serializable()]

public class MyDef: DefBase, IList, IEnumerable

{  

    // O/R Mapping fields

    [NonSerialized()]

    protected internal ObjectSet _ostOrm = null;

    ...

    // XML fields

    [NonSerialized()]

    protected internal XmlNode _xmlNode = null;

    ...

    public MyDef() { }

public MyDef(ArrayList al) : base(al) { }

public MyDef(ObjectSet ostOrm)

{

this._ostOrm = ostOrm;

this._typeEntity =

MyEntityType.ORM_OBJECTSPACES_OBJECTSET;

    }

    public MyDef(XmlNode xmlNode)

    {

       this._xmlNode = xmlNode;

    this._typeEntity = MyEntityType.XML_NODE;

    }

    ...

}