/// <summary>
/// 恢复联系人
/// </summary>
public void RecoveryMemorandum(ContactMemorandum memorandum)
{
//这里一定要使用深拷贝，否则会引用对象的传递，备份就无效
this.ContactList = CoreService.CloneData(memorandum.ContactList);
}
/// <summary>
/// 备份联系人
/// </summary>
public ContactMemorandum CreateMemorandum(string name)
{
//这里一定要使用深拷贝，否则会引用对象的传递，备份就无效
return(new ContactMemorandum(name, CoreService.CloneData(this.ContactList)));
}