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// Create an array. // Get its enumerator. // Move to the next item. // Get the current item. // Write it out.

To create a nongeneric interface enumerator class, you must declare a class that implements the IEnumerator interface. The IEnumerator interface has the following characteristics: It is a member of the System.Collections namespace. It contains the three members Current, MoveNext, and Reset.

The MessageBox class creates preformatted modal dialog boxes to display messages, errors, or warnings to the user. Since the dialog box is modal, the user must address it before continuing with the program. To display a message box, use the static Show method, giving it appropriate parameters. There are 12 overloads of the Show method, but for a simple informational dialog, you can use the twoparameter form, as shown in Figure 6-13.

You now need to tell the Film controller to make use of the FakeFilmReposiory. Open FilmController and add the following constructor to allow you to inject the fake repository: public FilmController(BobsMoviesMVC.Models.IFilmRepository Repository) { filmRepository = Repository; }

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The following code shows the outline of a nongeneric enumerator class. It does not show how the position is maintained. Notice that Current returns a reference to an object. using System.Collections; class MyEnumerator: IEnumerator { Returns a reference to an object public object Current { get; } public bool MoveNext() { ... } public void Reset() ... } { ... } // Include the namespace.

You can run tests in a number of ways. One way is to open the test window: 1. 2. 3. Select Test on the main menu; then choose Windows Test View.

Figure 6-13. The two-parameter Show method produces a simple informational message box. More generally, however, the message box has four areas that you can control, as shown in Figure 6-14. You control which set of buttons is shown and which image is shown by using the MessageBoxButton and MessageBoxImage enumerations, also listed in the figure. The following is an example of the syntax of the four-parameter form: MessageBox.Show( "My Message", "Simple Caption", MessageBoxButton.OKCancel, MessageBoxImage.Information ); // Message and Caption // Button Group // Image

For example, the following code implements an enumerator class that lists an array of color names: using System.Collections; class ColorEnumerator: IEnumerator { string[] Colors; Implements IEnumerator int Position = -1; 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; } public ColorEnumerator(string[] theColors) { Colors = new string[theColors.Length]; for (int i = 0; i < theColors.Length; i++) Colors[i] = theColors[i]; } } // MoveNext // Current

Select the test Film_Should_NotValidate_With_No_Title. Right-click it and select Run selection. After the test has run, a dialog indicating the current status will be displayed (see Figure 13-9).

The IEnumerable interface has only a single member, method GetEnumerator, which returns an enumerator for the object. Figure 20-4 shows class MyClass, which has three items to enumerate, and implements the IEnumerable interface by implementing the GetEnumerator method.

Figure 6-14. There are four parts to a MessageBox. You specify which image and which buttons to show by using the MessageBoxButton and MessageBoxImage enumerations. When the user closes the message box, the Show method returns a value that specifies which button the user clicked, allowing you to take the appropriate action. The five possible values are those of the MessageBoxResult enumeration Cancel, No, None, OK, and Yes.

At the time of writing, VS2010 includes a preview of ASP.NET MVC V2, the second generation of ASP.NET MVC. Microsoft says that the final release of ASP.NET MVC 2 is expected to contain the following new features:

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