圖層的可訪問性不能通過組裝

Question

我有一個跨層，Widget的業務層對象。我希望它在不同的圖層中公開一組不同的屬性。下面是如果編譯器閱讀評論它會怎樣看：

//bl.dll 

public abstract class Widget 
{ 
    //repo only 
    internal virtual Ppty_A {get;set;} //internal to implementation assembly of repo 

    //repo and service only 
    internal virtual Ppty_B {get;set;} //internal to implementation assemblies of repo/svc 

    //everyone inlcuding presentation 
    public virtual Ppty_C {get;set;} 
} 
public interface IWidgetService 
{ ... } } 
public interface IWidgetRepo 
{ ... } 
public class SimpleWidgetService : IWidgetService 
{ ... } 

//dal.dll 
using bl; 
public WidgetRepo 
{ ... } 

//presentation.dll 
using bl; 
public WidgetController 
{ 
    public WidgetController(IWidgetService ...) 
    ... 
} 

我的想法是這樣做（我沒有測試過這又和它只是解決了問題的一半）：

//bl.dll 
public abstract class Widget 
{ 
    //repo only simply can't be defined in the abstraction -- can't see you => no contract 

    //repo and service only has to be public? 
    public virtual Ppty_B {get;set;} 

    //at least public is public... 
    public virtual Ppty_C {get;set;} 
} 

//dal.dll 
using bl; 
public SQLWidget : Widget //Or actually DALBLWidget -- see below? 
{ 
    //repo only 
    internal ... 
    internal ... 

    //the rest 
    ... 
} 

我應該創建另一個抽象的Widget（有一個DAL-BL Widget和一個BL-UI Widget）？

Answer 1

您可以讓Widget類實現與每個圖層對應的不同接口。

public class Widget : IDataLayerWidget, IBusinessLayerWidget 
{ 
// Properties 
} 

public interface IDataLayerWidget 
{ 
    // Properties visible to the DataLayer 
} 

public interface IBusinessLayerWidget 
{ 
    // Properties visible to the BusinessLayer 
} 

在你的數據層，你會與IDataLayerWidget並與IBusinessLayerWidget業務層的工作。