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Figure 20-4. The GetEnumerator method returns an enumerator object for the class. The following code shows the form for the declaration of an enumerable class: using System.Collections; Implements the IEnumerable interface class MyClass : IEnumerable { public IEnumerator GetEnumerator { ... } ... } Returns an object of type IEnumerator The following code gives an example of an enumerable class that uses enumerator class ColorEnumerator from the previous example. Remember that ColorEnumerator implements IEnumerator. using System.Collections; class MyColors: IEnumerable { string[] Colors = { "Red", "Yellow", "Blue" }; public IEnumerator GetEnumerator() { return new ColorEnumerator(Colors); } An instance of the enumerator class

The ScrollViewer adds scroll bars to its Content element if the content is too large to be displayed in the allocated area. For example, Figure 6-15 shows two windows with ScrollViewer controls. In the first case, there s not enough room to show all six buttons. In the second case, there s not enough room to show the entire image. In both cases, the ScrollViewer adds a scroll bar on the right.

Areas that allow you to group controllers and views New annotation attributes for validation logic New Html.EditorFor and Html.DisplayFor methods

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Putting the MyColors and ColorEnumerator examples together, you can add a class called Program with a Main method that creates an instance of MyColors and uses it in a foreach loop. using System; using System.Collections; namespace ColorCollectionEnumerator { class ColorEnumerator: IEnumerator { string[] Colors; int Position = -1; public ColorEnumerator(string[] theColors) { Colors = new string[theColors.Length]; for (int i = 0; i < theColors.Length; i++) Colors[i] = theColors[i]; } public object Current { get { if (Position == -1) { throw new InvalidOperationException(); } if (Position == Colors.Length) { throw new InvalidOperationException(); } return Colors[Position]; } } public bool MoveNext() { if (Position < Colors.Length - 1) { Position++; return true; } else return false; } public void Reset() { Position = -1; } } // MoveNext // Constructor

class MyColors: IEnumerable { string[] Colors = { "Red", "Yellow", "Blue" }; public IEnumerator GetEnumerator() { return new ColorEnumerator(Colors); } } class Program { static void Main() { MyColors mc = new MyColors(); foreach (string color in mc) Console.WriteLine(color); } } } This code produces the following output: Red Yellow Blue

I asked a few developers about their experiences with using the ASP.NET MVC. Below is Jeremy Skinner s (a member of the MVC contrib project) experience with developing a site for college applications using ASP.NET MVC:

Figure 6-15. You can use the ScrollViewer to automatically put scroll bars on content that is too large for its container. The following is the markup for the ScrollViewer containing the Buttons: <Grid> <ScrollViewer> <StackPanel> <Button>Button 1</Button> <Button>Button 20</Button> <Button>Button 300</Button> <Button>Button 4000</Button> <Button>Button 50000</Button> <Button>Button 600000</Button> </StackPanel> </ScrollViewer> </Grid> The following is the markup for the ScrollViewer containing the Image: <ScrollViewer> <Image Source="ChurchSmall.jpg" /> </ScrollViewer>

You ve just seen how to use the IEnumerable and IEnumerator interfaces to create useful enumerables and enumerators. But there are several drawbacks to this method. First, remember that the object returned by Current is of type object. For value types, this means that before they are returned by Current, they must be boxed to turn them into objects. They must then be unboxed again after they have been received from Current. This can exact a substantial performance penalty if it needs to be done on large amounts of data. Another drawback of the nongeneric interface method is that you ve lost type safety. The values being enumerated are being handled as objects and so can be of any type. This eliminates the safety of compile-time type checking. You can solve these problems by making the following changes to the enumerator/enumerable class declarations. For the enumerator class Do not derive the class from IEnumerator. Implement MoveNext just as before. Implement Current just as before but have as its return type the type of the items being enumerated. You do not have to implement Reset.

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