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While our classes are basically ready, there are some additional issues that will affect the robustness of our application in future chapters. This section will address a number of these issues in order to make our library a bit more sturdy. These topics apply more generally to any class library, so are probably worth considering while developing your own libraries as well. This section will look at the following areas: Handling the potential exception when a bitmap is created. Ensuring that photographs are compared as expected. Cleaning up system resources used by our classes. Associating a file name with an album. We will examine each issue separately.

The /t:winexe switch tells the compiler to create a Windows application rather than a console program To run the program, simply enter WinSkel at the command line

HANDLING AN INVALID BITMAP We discussed the concept of exceptions in chapter 2. Here, there is a potential exception when we create our Bitmap object for the Image property. Look back at our definition of this property.

Part II:

To compile the program using the Visual Studio IDE, first create a new Windows Application project Do this by selecting File | New Project Then select Windows Forms Application in the New Project dialog box Call the project WinSkel Delete all C# source code files that were automatically created Next, right-click on the WinSkel project name and select Add and then select New Item From the Add New Item dialog box, select C# Code File, and name the file MyWinProjectcs Now, enter the skeleton code exactly as shown, and then build the solution To run the project, select Debug | Start Without Debugging

public Bitmap Image { get { if (_bitmap == null) { _bitmap = new Bitmap(_fileName); } return _bitmap; } }

In general, the functionality of a window is expressed by two types of items: controls and menus It is through these items that a user interacts with your program Menus are described later in this chapter Here you will see how to add a control to a window Windows defines many different types of controls, including pushbuttons, check boxes, radio buttons, and list boxes, to name just a few Although each type of control is different, they all work in more or the less the same way Here, we will add a pushbutton to a window, but the same basic procedure can be used to add other types of controls

If the file is an invalid bitmap, or cannot be loaded for some reason, this presents a real problem. On the one hand, this is an error, so perhaps we should return null or allow the exception to be thrown. On the other hand, the caller is expecting to display a Bitmap, and checking for null or an exception every time seems a bit cumbersome, not to mention the issue of what the caller should then display in lieu of a Bitmap object. As an alternative approach, we will instead create a special bitmap to return whenever the file cannot be loaded. This provides a Bitmap that the caller can display in any situation, but still indicates that something is wrong. We will create a private static member of our Photograph class to hold this special image, and provide a new property to indicate if a valid image for the current Photograph exists. Let s see how this looks.

A pushbutton is encapsulated by the Button class It inherits the abstract class ButtonBase, which inherits the Control class Button defines only one constructor, which is shown here: public Button( ) This creates a button that has a default size and location within the window It contains no description Before a button can be used, it will need to be given a description by assigning a string to its Text property To specify the location of the button within the window, you must assign the coordinates of its upper-left corner to the Location property The Location property is inherited from Control and defined like this: public Point Location { get; set; } The coordinates are contained within a Point structure, which is defined in the SystemDrawing namespace It includes these two properties: public int X { get; set; } public int Y { get; set; } Thus, to create a button that contains the description Press Here and is positioned at location 100, 200, use the following sequence: