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As explained, all C# types, including the value types, are derived from object Thus, a reference of type object can be used to refer to any other type, including value types When an object reference refers to a value type, a process known as boxing occurs Boxing causes the value of a value type to be stored in an object instance Thus, a value type is boxed inside an object This object can then be used like any other object In all cases, boxing occurs automatically You simply assign a value to an object reference C# handles the rest Unboxing is the process of retrieving a value from a boxed object This action is performed using an explicit cast from the object reference to its corresponding value type Attempting to unbox an object into a different type will result in a runtime error

protected bool CloseCurrentAlbum() {

Part I:

method to the MainForm.cs source code window. 2 Offer to save the album if it has been modified. Define an appropriate message to display. Note: We vary the message text depending on whether the current album has a name or not. 4 Display the message box and record the result.

Here is a simple example that illustrates boxing and unboxing:

// A simple boxing/unboxing example using System; class BoxingDemo { static void Main() { int x; object obj; x = 10; obj = x; // box x into an object int y = (int)obj; // unbox obj into an int ConsoleWriteLine(y); } }

if (_bAlbumChanged) { // Offer to save the current album string msg; if (_album.FileName == null) msg = "Do you want to save the " + "current album "; else msg = String.Format("Do you want to " + "save your changes to \n{0} ", _album.FileName); DialogResult result = MessageBox.Show(this, msg, "Save Current Album ", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question); if (result == DialogResult.Yes) menuSave_Click(this,EventArgs.Empty); else if (result == DialogResult.Cancel) { // Do not close the album return false; } } // Close the album and return true if (_album != null) _album.Dispose(); _album = new PhotoAlbum(); SetTitleBar(); _bAlbumChanged = false; return true; }

This program displays the value 10 Notice that the value in x is boxed simply by assigning it to obj, which is an object reference The integer value in obj is retrieved by casting obj to int Here is another, more interesting example of boxing In this case, an int is passed as an argument to the Sqr( ) method, which uses an object parameter

20 01484 09889 56384 6764 64749 67341 01962 09806 74567 6707 82875 86192 02425 09702 92146 6636 10038 10440

We will use this new method in three different places to ensure that the user has the option of saving any changes he or she might make to the album. MESSAGE BOXES 231

// Boxing also occurs when passing values using System; class BoxingDemo { static void Main() { int x; x = 10; ConsoleWriteLine("Here is x: " + x); // x is automatically boxed when passed to Sqr() x = BoxingDemoSqr(x); ConsoleWriteLine("Here is x squared: " + x); } static int Sqr(object o) { return (int)o * (int)o; } }

The output from the program is shown here:

In menuNew_Click to save the existing album before a new album is created. In menuOpen_Click to save the album before a new album is selected. In menuExit_Click to save the album before the application exits. We will modify the handlers for the New and Open menus here. The Exit menu presents some additional issues, which we will take up in the next section. The following table continues our previous steps.

Here is x: 10 Here is x squared: 100

UPDATE THE HANDLERS FOR THE NEW AND OPEN MENUS Action 7 Modify the menuNew_Click method to use the CloseCurrentAlbum method. Result

Here, the value of x is automatically boxed when it is passed to Sqr( ) Boxing and unboxing allow C# s type system to be fully unified All types derive from object A reference to any type can be assigned to a variable of type object Boxing and

11:

protected void menuNew_Click (object sender, System.EventArgs e) { if (this.CloseCurrentAlbum() == true) { // Make sure the window is redrawn this.Invalidate(); } } protected void menuOpen_Click (object sender, System.EventArgs e) { // Save the existing album, if necessary if (this.CloseCurrentAlbum() == false) { // Cancel this operation return; } OpenFileDialog dlg = new OpenFileDialog(); . . . }

unboxing automatically handle the details for the value types Furthermore, because all types are derived from object, they all have access to object s methods For example, consider the following rather surprising program: