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Result The objects appear in the component tray area below the form. Note: The first list will contain the large icons for the View.LargeIcon display mode, and the second the small icons for all other modes. Since the icons provided in the common image area define both image types, each list will use the same set of files. The Size property defines the actual image to use by each list. The icons are stored in the image list and available to the application. Note: The first icon will be used for Photograph objects later in this chapter. The next two are for a good and bad album, respectively. The final three will be used in chapter 15 when discussing the TreeView class.

The output from the program is shown here:

Settings Image 0 1 2 3 4 5 File icons/Misc/FACE01.ico icons/Writing/BOOK01A.ico icons/Misc/MISC02.ico icons/Misc/FACE02.ico icons/Writing/BOOK02.ico icons/Writing/BOOKS04.ico

One other point about the preceding example As mentioned, Sqrt( ) is a member of the Math class Notice how Sqrt( ) is called; it is preceded by the name Math This is similar to the way Console precedes WriteLine( ) Although not all standard methods are called by specifying their class name first, several are, as the next example shows The following program demonstrates several of C# s trigonometric functions, which are also part of C# s math library They also operate on double data The program displays the sine, cosine, and tangent for the angles (measured in radians) from 01 to 10

// Demonstrate MathSin(), MathCos(), and MathTan()

Similarly, define the same set of images for the imageListSmall object. Note: You might be tempted to create this image list by making a copy of the imageListLarge object and then applying the settings from step 1. While this works, the small images are scaled from the larger size stored in the imageListLarge object, resulting in poorer quality icons.

using System; class Trigonometry { static void Main() { Double theta; // angle in radians for(theta = 01; theta <= 10; theta = theta + 01) { ConsoleWriteLine("Sine of " + theta + " is " + MathSin(theta)); ConsoleWriteLine("Cosine of " + theta + " is " + MathCos(theta)); ConsoleWriteLine("Tangent of " + theta + " is " + MathTan(theta)); ConsoleWriteLine(); } } }

The code generated by these changes is similar to examples we have seen before. The images are stored in a .resx file for the MainForm object, and loaded into the application using the ResourceManager class. Now that we have the image lists defined, the form containing a ListView control, and the View menu primed and ready, we have nothing to do but add our photo albums to the list. We do this in the OnLoad method, which is called just before the Form displays the first time. We could instead add these items in the MainForm constructor, but the OnLoad method is preferred for such actions to ensure that the Form is fully initialized. Let s see how this code looks.

Here is a portion of the program s output:

Sine of 01 is 00998334166468282 Cosine of 01 is 0995004165278026 Tangent of 01 is 0100334672085451 Sine of 02 is 0198669330795061 Cosine of 02 is 0980066577841242 Tangent of 02 is 0202710035508673 Sine of 03 is 029552020666134 Cosine of 03 is 0955336489125606 Tangent of 03 is 0309336249609623

ADD EACH ALBUM TO THE VIEW Action 5 In the MainForm.cs source code window, indicate that this file will use members of the System.IO and the Manning.MyPhotoAlbum namespaces. Add a set of constant fields for the image list indices required.

To compute the sine, cosine, and tangent, the standard library methods MathSin( ), MathCos( ), and MathTan( ) are used Like MathSqrt( ), the trigonometric methods are called with a double argument, and they return a double result The angles must be specified in radians

Figure 10-14

using System.IO; using Manning.MyPhotoAlbum;

Part I:

You can create indexers for multidimensional arrays, too For example, here is a twodimensional fail-soft array Pay close attention to the way that the indexer is declared

private const int PhotoIndex = 0; private const int AlbumIndex = 1; private const int ErrorIndex = 2;

// A two-dimensional fail-soft array using System; class FailSoftArray2D { int[,] a; // reference to underlying 2D array int rows, cols; // dimensions public int Length; // Length is public public bool ErrFlag; // indicates outcome of last operation // Construct array given its dimensions public FailSoftArray2D(int r, int c) {

Using constants in this manner is a good idea in case our values ever change in the future. 7 Modify the OnLoad method to load the default set of albums through a private method. Create a private OpenAlbum method to open an album.

10: