如何使用Fluent NHibernate映射私有範圍的組件？

Question

我必須列在傳統的模式，我想映射爲一個組件（又名值類型）。對組件/值類型的引用是私有的。

實體的代碼看起來像這樣：

public class Allocation : Entity<int> 
{ 
    //... 
    private readonly Money price; 

    protected Allocation() {} /* for NH only */ 

    public Allocation(/* ... */ Money price) 
    { 
     //... 
     this.price = price; 
    } 
} 

值類型代碼看起來像這樣：

public struct Money 
{ 
    private readonly decimal amount; 
    private readonly int currencyId; 

    public Money(decimal amount, int currencyId) 
    { 
     this.amount = amount; 
     this.currencyId = currencyId; 
    } 
} 

當前映射看起來像這樣：

Component(Reveal.Member<Allocation, Money>("price"), 
      p => 
      { 
      p.Map(Reveal.Member<Money>("amount")).Column("CURRENCY_PRICE").Not.Nullable(); 
      p.Map(Reveal.Member<Money>("currencyId")).Column("CURRENCY").Not.Nullable(); 
      }); 

目前，上面的代碼會引發以下異常：

System.ArgumentException : Expression of type 'System.Object' cannot be used for return type 'BI.IPM.Services.TradeAllocation.Domain.Entities.Money' 

Answer 1

的IUserType可以幫助，你可以再新了在NullSafeGet/set方法貨幣實例。

there's some links to a money usertype in here.