pdf417 source code c# IUndoableObject Interface in Visual C#

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IUndoableObject Interface
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In the same way that IBusinessObject provides a form of polymorphism and commonality across all business objects, IUndoableObject does the same thing for editable business objects. Specifically, those that inherit from BusinessBase<T> and BusinessListBase<T,C>. This polymorphic ability will be of critical importance in the implementation of UndoableBase later in the chapter. UndoableBase needs to be able to treat all editable objects the same in order to implement the n-level undo functionality. Here s the code for IUndoableObject: namespace Csla.Core { public interface IUndoableObject : IBusinessObject { void CopyState(); void UndoChanges(); void AcceptChanges(); } }
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First notice that this interface inherits from the IBusinessObject interface. This means that all editable objects implementing this interface will automatically be business objects in the broader sense. All editable objects support n-level undo. The n-level undo support implemented by UndoableBase requires that every object implement the three methods listed in this interface. Putting these methods in an interface is a double-edged sword. On one hand it clearly defines the methods and will make it easier to implement UndoableBase. On the other hand, these methods are now potentially available to any code using a business object. In other words, a UI developer could write code to call these methods almost certainly causing nasty bugs and side-effects, because these methods aren t designed for public use. This is a difficult design decision when building frameworks. In this case the benefits of having a common interface for use by UndoableBase appears to outweigh the potential risk of a UI developer doing something foolish by calling the methods directly. To help minimize this risk, the actual implementation methods in the base classes will keep these methods private. That way, they can only be called by directly casting the object to the IUndoableObject type.
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IEditableCollection Interface
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While a BusinessListBase<T,C> is both a business object and an editable object, it is also a collection. It turns out that collections need one extra behavior beyond a simple editable object, so the IEditableCollection interface adds that extra method: namespace Csla.Core { [System.Diagnostics.CodeAnalysis.SuppressMessage( "Microsoft.Naming", "CA1711:IdentifiersShouldNotHaveIncorrectSuffix")] public interface IEditableCollection : IUndoableObject { void RemoveChild(Core.BusinessBase child); } } The RemoveChild() method will be important later in the chapter during the implementation of BusinessBase and BusinessListBase, and specifically for the implementation of the System. ComponentModel.IEditableObject interface. This interface has some tricky requirements for interaction between a child object in a collection and the collection itself. Also notice the SuppressMessage attribute applied to the interface. Some versions of Visual Studio 2005 offer a code analysis feature. This is a powerful feature that can be used to pro-actively find bugs and other problems with your code. It applies a set of naming standards to your code as part of its analysis, which is often good. Sometimes, however, you don t want to follow the recommendation. In that case, this attribute can be applied to tell code analysis to be silent on a specific issue. You ll see this type of attribute used here and there throughout the code in s 3 through 5.
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IReadOnlyObject Interface
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In the same way that IBusinessObject provides a form of polymorphism and commonality across all business objects, IReadOnlyObject does the same thing for read-only business objects specifically those that inherit from ReadOnlyBase<T>. It turns out that all read-only objects support a method for authorization: CanReadProperty(). This method is defined in the interface as follows:
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public interface IReadOnlyObject : IBusinessObject { bool CanReadProperty(string propertyName); } The CanReadProperty() method will be discussed later in the chapter.
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IReadOnlyCollection Interface
The IReadOnlyCollection interface exists purely to support polymorphism for read-only collection objects that inherit from ReadOnlyListBase<T, C>. As such, it is an empty interface. interface IReadOnlyCollection : IBusinessObject { } You can use this interface to easily determine if a business object is a read-only collection as needed within your business or UI code.
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