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.NET lets you inherit from a class in a compiled DLL for which you neither have nor control the source code. This raises an interesting question: what happens if you extend the base class with a method or a property and then the author of the base class releases a new version that exposes a member with the same name Visual Basic copes with this situation in such a way that the application that uses the derived class isn t broken by changes in the base class. If the derived class has a mem ber with the same name as a member in the new version of the base class, you get a compilation warning, but you are still able to compile the two classes. In this case, the member in the derived class is said to be shadowing the member with the same name in the base class. Visual Basic offers three different syntax forms of shadowing:

A member in the derived class shadows all the members in the base class with the same name, regardless of their parameter signatures. As I ve explained, you get a compilation warning that doesn t prevent successful compilation (unless you select the Treat Compiler Warnings As Errors check box on the Build page of the project Property Pages dialog box). A member in the derived class marked with the Shadows keyword hides all the members in the base class with the same name, regardless of their signatures. The effect is exactly the same as in the preceding case. In addition, you don t get any compilation warning, so you should use the Shadows keyword to make it clear that you are intentionally shadowing one or more members in the base class. A member in the derived class marked with the Overloads keyword shadows only the member in the base class that has the same name and argument signature. (Note that you can t apply the Shadows and Overloads keywords to the same member.)

Shadowing can be confusing, so it s best to look at a concrete example:

Class AAA Sub DoSomething() Console.WriteLine( AAA.DoSomething ) End Sub Sub DoSomething(ByVal msg As String) Console.WriteLine( AAA.DoSomething({0})", msg) End Sub Sub DoSomething2() Console.WriteLine( AAA.DoSomething2 ) End Sub Sub DoSomething2(ByVal msg As String) Console.WriteLine( AAA.DoSomething2({0})", msg) End Sub

You ve placed the top left corner of the text at the spot 20 pixels across the screen and 30 pixels down. The text that you re writing is the famous string Hello World, which is, by one of the laws of the universe, what your first program that prints text should say. In a C# program, you enter a string as a sequence of characters enclosed in double quotation marks. You re printing the text in Red. If you run this program, you get the display shown in Figure 5-5.

5:

4

End Class Class BBB Inherits AAA Overloads Sub DoSomething() Console.WriteLine( BBB.DoSomething ) End Sub Shadows Sub DoSomething2() Console.WriteLine( BBB.DoSomething2 ) End Sub End Class

Overridable Sub SaveToFile(ByVal fileName As String)

End Sub Load RTF contents from file. Overridable Sub LoadFromFile(ByVal fileName As String) End Sub Print the RTF contents. Overridable Sub Print() End Sub End Class

Now you can define other classes that inherit their behavior from the Document virtual class:

Although it is perfectly okay to make your first program print something other than Hello World, I take no responsibility for any misfortune that you suffer as a result of offending the programming gods in this way.

Class PurchaseOrder Inherits Document Redefines how a PO is printed. Overrides Sub Print() End Sub End Class

The Text In Over ow button appears below the text box, indicating that this box contains more text than is displayed.

Note that you must explicitly use the Overridable keyword in the base class and the Overrides keyword in the inherited class, even if the base class is marked with MustIn herit, because the base class can contain nonoverridable members as well.

In general, users of a virtual class aren t forced to override its properties and methods. After all, the main benefit in defining a virtual class is that derived classes can reuse the code in the base class. Sometimes, however, you want to force inherited classes to provide a custom version of a given method. For example, consider this Shape virtual class, which defines a few properties and methods that all geometrical shapes have in common:

MustInherit Class Shape Position on the X-Y plane Public X, Y As Single Move the object on the X-Y plane. Sub Offset(ByVal deltaX As Single, ByVal deltaY As Single) X = X + deltaX Y = Y + deltaY Redraw the shape at the new position. Display End Sub Sub Display() No implementation here End Sub End Class