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问：如何为eXpressApp Framework设置默认属性值？

答：参考以下代码：

所有的base persistent classes都放在PersistentBase类中，这个类让用于初始化AfterConstruction method，

简单的属性值初始化：

public class Contact : Person {
//... 
    public override void AfterConstruction() {
        base.AfterConstruction();

        FirstName = "Sam";
        TitleOfCourtesy = TitleOfCourtesy.Mr;
    }
}

用当前或新的对象初始化Reference属性：

public class Contact : Person {
//... 
    public override void AfterConstruction() {
        base.AfterConstruction();

        Address1 = new Address(Session);
        Address1.Country = Session.FindObject<Country>(CriteriaOperator.Parse("Name = 'USA'"));
        if(Address1.Country == null) {
            Address1.Country = new Country(Session);
            Address1.Country.Name = "USA";                
            Address1.Country.Save();

        Manager = Session.FindObject<Contact>(CriteriaOperator.Parse(
            "FirstName = 'John' && LastName = 'Doe'"));
        }            
    }
}

Collection属性

用预定义的Phone numbers填充Phones collection：

public class Contact : Person {
//... 
    public override void AfterConstruction() {
        base.AfterConstruction();

        PhoneNumber phone1 = Session.FindObject<PhoneNumber>(CriteriaOperator.Parse(
            "Number = '555-0101'"));
        PhoneNumber phone2 = Session.FindObject<PhoneNumber>(CriteriaOperator.Parse(
            "Number = '555-0102'"));
        PhoneNumbers.Add(phone1);
        PhoneNumbers.Add(phone2);
    }
}