1、添加主实体Model类
public class Contact
{
public int ContactID{get;set;}
public string ContactName{get;set;}
public string CellPhone{get;set;}
public ContactGroup Group{get;set;}
}
2.添加子实体Model类
public class ContactGroup
{
public int GroupID{get;set;}
public string GroupName{get;set;}
}
3.建立DAL层
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