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a. Load the file name and caption using the ReadVersion83 method. b. Read the date as a string and convert it to a long integer to instantiate a DateTime object. c. Read the photographer as a string. d. For the notes, read in the number of characters and use this value to read an equivalent-sized array of characters. This array can then be used to create a string. e. After the Notes property is set, a final ReadLine call is required to clear the final line in preparation for reading the next Photograph object. 7 Create a public delegate to use when selecting the appropriate reader.

Before we update the Save and Open methods in the PhotoAlbum class, a short discussion of our sudden use of the delegate keyword is in order. We briefly mentioned in chapter 1 that a delegate acts much like a function pointer in C++. It identifies the signature for a method without actually defining a method. The advantage of C# delegates is that they are type safe. It is impossible to assign a nonconforming method to a delegate. In our code, we create a delegate called ReadDelegate. This delegate encapsulates methods that accept a single StreamReader parameter and return a Photograph object. It just so happens that this matches the signature of the three read methods we created in the prior steps. This delegate can be used to great advantage when opening an album. Let s see how this looks.

Personal Computers Hardware standardization Manufacturer approval Data storage media Display device Basic input devices Network capability Some Not required Large High-resolution monitor Keyboard, mouse, joystick, controller (less common) Modems to broadband Home Game Consoles Strict Required Small or nonexistent Color TV Standardized controller Modems, broadband coming

UPDATE THE SAVE AND OPEN METHODS IN PHOTOALBUM CLASS Action 8 In the PhotoAlbum.cs source code window, set the current version constant to 92. Modify the Save method to use the new Photograph.Write method. Note: The initial part of this method creates the FileStream and StreamWriter objects. This code does not change, and is not shown here. Similarly, the code for the finally clause is also not shown. Result

.

private const int CurrentVersion = 92;

public void Save(string fileName) { . . . try { sw.WriteLine( _CurrentVersion.ToString()); // Store each photo separately foreach (Photograph photo in this) { photo.Write(sw); } this._fileName = fileName; } finally . . . }

Personal Computers Usage profile Distribution media Distribution mechanisms Awkward for more than one person to use DVDs, CDs, the Internet Retail, bundling, shareware

Ultimately, an MDI application is simply a collection of Forms displayed in a parent window. The .NET Framework provides some assistance in managing these forms within this parent. In this section we will discuss child form layout and how to show the active forms in a menu. The Form class contains a LayoutMdi method for the former, while the MenuItem class contains an MdiList property for the latter. A new top-level Window menu, as shown in figure 16.9, will make use of these constructs.

Figure 16.9 The new Window menu for our application will support options related to managing child forms within the parent window.

Of course, if you do find an error here or elsewhere in the book, please send me an email so the correction can be posted online and the error corrected in the next edition.