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This assigns the x location of the bread to the value of breadX. This looks a lot like direct access to a member of a class, but what is actually happening is that the code inside the get portion of the property is running and the value following the return is being sent back as the result of the property. At the moment, there is no way that the position of the bread can be changed (which is what we want in this case). However, this would not stop programmers like your younger brother from trying, as in the following code:

shape by clicking the shape that has the desired attributes, clicking the Format Painter button on the Standard toolbar, and then clicking the shape to which you want to copy the attributes. If you want to apply the attributes of a shape to all future shapes in the same publication (for example, if you want all shapes to be red), double-click the shape, and on the Colors And Lines tab of the Format AutoShape dialog box, select the Apply Settings To New AutoShapes check box.

Using the TextFileReader class is a breeze:

Note that you might make the code a bit more concise by having TextFileReader imple ment both the IEnumerable and the IEnumerator interface. In general, however, keep ing the enumerator in a distinct class makes for a better design and helps make your code reusable. The .NET classes that implement the IEnumerable interface expose a Public GetEnu merator method that you can call explicitly. This technique lets you simplify the imple mentation of an enumerable class by implementing the IEnumerable interface only and having its GetEnumerator method return an instance of an inner object that supports IEnumerable. Here s the example of a class named ReverseIterator that can be used in a For Each loop to iterate over the elements of a collectionlike object that is, any object that implements the ICollection interface and hence the For Each statement in reverse order. The class uses an inner ArrayList object that is filled in the constructor method in such a way that the last element in the original collection becomes the first element in the ArrayList:

Class ReverseIterator Implements IEnumerable The inner ArrayList Dim list As New ArrayList() The constructor takes an object that can be enumerated. Sub New(ByVal col As ICollection) Insert elements in reverse order. For Each o As Object In col list.Insert(0, o) Next End Sub Return the enumerator of the inner ArrayList. Function GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator Return list.GetEnumerator() End Function End Class

Part III:

Bread.XPos = 99;

Here s the code that uses the ReverseIterator class:

To show a relationship between two shapes, you can connect them with a line by joining special handles called connection points. Moving a connected shape also moves the line, maintaining the relationship between the connected shapes.

Dim arr() As String = {"one", two", three", four", five"} For Each s As String In New ReverseIterator(arr) Console.WriteLine(s) Next

Read the document Invoking IEnumerator Members.doc on the companion CD to see how your code can get extra flexibility by directly calling the members of the IEnumera tor interface (instead of having Visual Basic .NET do it implicitly in a For Each loop).

At this point, you have added many new classes to your data structure arsenal, and you should be more familiar with how things work in the .NET world, such as how you use inheritance to derive new and more powerful data classes. It s now time to start work ing with other classes in the .NET Framework, such as files and directories.

The .NET Framework offers excellent support for working with files and directories via the classes in the System.IO namespace. These are the five classes of interest:

Because there is no set behavior, this fails to compile. However, you can provide such a behavior if you like by adding a set part to the property declaration, as shown here in bold:

Contains shared methods that let you enumerate and manipulate files Contains shared methods to manipulate path information

2

DirectoryInfo Represents an individual directory and exposes the methods to query its attributes and manipulate them FileInfo Represents an individual file and exposes the methods to query its attributes and manipulate them