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Design Considerations Inheritance is a powerful tool in object-oriented programming and is used extensively in the .NET Framework. The following points will help you write classes that work better together and are less error-prone. The is-a relationship Remember that inheritance models the is-a relationship between objects. The derived classes should represent objects that truly are special cases of the base object. If you find yourself trying to eliminate properties or methods of the base class, then you don t have an is-a relationship. For example, if you re creating a class that derives from the Button class but you re trying to eliminate the Click event, the new class isn t really a Button. It might be something like a button, but it isn t a button. Polymorphism If you aren t going to use the classes polymorphically, consider whether you need to use inheritance at all. It might be that your class only needs to contain an instance of the class rather than serve as a base class. Type-checking In general, type-checking (using the type of operator) is a clue that you are using inheritance incorrectly. Analyze your code to determine whether the objects truly represent an is-a relationship. Determine whether you re defining the proper properties and methods so that type-checking is unnecessary. Select or switch statements If your code is full of select or switch statements, consider whether using inheritance would simplify the code. Consider the following code snippet where you have defined a Shape class with a type property that will be set to Rectangle or Circle. To draw the Shape object, you might write some code like this: If aShape.Type = "Rectangle" then DrawARectangle() Else DrawACircle() End If
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Using inheritance, you might create a Shape class with a Draw method as the base class. Then you would create Rectangle and Circle classes as derived classes, and override the Draw method in each class. Then you would replace the preceding code with the following: aShape is a reference to the Shape class, but is currently referring to either a Rectangle or Circle aShape.Draw() Single inheritance Visual Basic and Visual C# provide single inheritance only. That means you can specify only one base class. Sometimes the choice is obvious, such as BankAccount as a base class for SavingsAccount. But if you want to be able to drag a SavingsAccount onto your form as you would a Timer control or a TextBox, you might want to derive from one of the control or component classes. Because derived classes also inherit from their base classes, you could use the control as the base class for BankAccount, and then derive SavingsAccount from BankAccount. Another way to get the behavior of multiple inheritance using single inheritance is with interfaces, as you ll see in 9.
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Quick Reference
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To Declare a base class Do this Create any class. Visual Basic Public BaseClass End Class // Visual C# public BaseClass { } In Visual Basic, use the Inherits keyword. Visual Basic Public SomeClass Inherits BaseClass End Class In C#, use the : character. public BaseClass : BaseClass { } Or Use the Add Class Wizard and select the base class. Declare a protected field Add the protected keyword. Visual BasicPublic BaseClass Protected aField As Integer End Class // Visual C# public BaseClass { protected int aField;} Use the MyBase or base keyword. Visual Basic Public Sub New() MyBase.New() End Sub
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Do this // Visual C# public DerivedClass() : base() { }
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In the base class, add the overridable property to the property declaration. Visual Basic Public Overridable ReadOnly_ Property ID() As String Get Return m_owner End Get End Property // Visual C# virtual public string ID { get { return m_owner; } } In the derived class, add the override keyword to the property declaration. Visual Basic Public Overrides ReadOnly_ Property ID() As String Get Return Me.m_owner & "-S" End Get End Property // Visual C# override public string ID { get { return this.m_owner + "-S"; } } Or In Visual Basic, click the property to override in the Method Name list in the code editor. In Visual C#, right-click the base class property in the Class View, and then point to Add and click Override on the shortcut menu. In the base class, add the Overridable or virtual keyword to the method declaration. Visual Basic Public Overridable_ Function Withdraw(ByVal amount As Decimal)_ As Decimal End Function // Visual C# virtual public decimal Withdraw(decimal amount) { } In the derived class, add the Overrides or override keyword to the method declaration. Public Overrides_ Function Withdraw(ByVal amount As Decimal)_
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