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Runtime type identification (RTTI) allows the type of an object to be determined during program execution RTTI is useful for many reasons For example, you can discover precisely what type of object is being referred to by a base-class reference Another use of RTTI is to test in advance whether a cast will succeed, preventing an invalid cast exception Runtime type identification is also a key component of reflection C# includes three keywords that support runtime type identification: is, as, and typeof Each is examined in turn

You can determine if an object is of a certain type by using the is operator Its general form is shown here: expr is type Here, expr is an expression that describes an object whose type is being tested against type If the type of expr is the same as, or compatible with, type, then the outcome of this operation is true Otherwise, it is false Thus, if the outcome is true, expr is some form of type As it applies to is, one type is compatible with another if both are the same type, or if a reference, boxing, or unboxing conversion exists

album, and update both the album and the ListView control with any changes made by the user. The following steps explain how to add both the menu and the Click handler.

Part I:

Set the version number of the MyAlbumExplorer application to 14.4. ADD A MENU TO DISPLAY ALBUM PROPERTIES Action 1 In the MainForm.cs [Design] window, add a Properties menu under the Edit menu.

Here is an example that uses is:

Settings Property (Name) Text Value menuProperties &Properties private void menuProperties_Click (object sender, System.EventArgs e) { if (listViewMain.SelectedItems.Count <= 0) return; ListViewItem item = listViewMain.SelectedItems[0]; DisplayAlbumProperties(item); }

// Demonstrate is using System; class A {} class B : A {} class UseIs { static void Main() { A a = new A(); B b = new B(); if(a is A) ConsoleWriteLine("a is an A"); if(b is A) ConsoleWriteLine("b is an A because it is derived from A"); if(a is B) ConsoleWriteLine("This won t display -- a not derived from B"); if(b is B) ConsoleWriteLine("B is a B"); if(a is object) ConsoleWriteLine("a is an object"); } }

The output is shown here:

Add a Click event handler for this menu to display the property dialog for the selected album, if any. Note: We separate the display logic into a separate DisplayAlbumProperties method in case we ever want to call it from other portions of our application.

Most of the is expressions are self-explanatory, but two may need a little discussion First, notice this statement:

In order to locate the album file name in our new method, record the album file name in the Tag property associated with each list item in the LoadAlbumData method.

if(b is A) ConsoleWriteLine("b is an A because it is derived from A");

Figure 10-40

The if succeeds because b is an object of type B, which is derived from type A Thus, b is an A However, the reverse is not true When this line is executed,

private void LoadAlbumData(string dir) { . . . foreach (string s in albumFiles) { . . . if (album != null) { item.Tag = album.FileName; item.ImageIndex = MainForm.AlbumIndex; . . . private void DisplayAlbumProperties (ListViewItem item) {

if(a is B) ConsoleWriteLine("This won t display -- a not derived from B");

method to display the album dialog. 5 Implement this method by obtaining the file name for the selected album. Try to open the album corresponding to this file name.

Sometimes you will want to try a conversion at runtime, but not throw an exception if the conversion fails (which is the case when a cast is used) To do this, use the as operator, which has this general form: expr as type

17:

string fileName = item.Tag as string;

Here, expr is the expression being converted to type If the conversion succeeds, then a reference to type is returned Otherwise, a null reference is returned The as operator can be used to perform only reference, boxing, unboxing, or identity conversions The as operator offers a streamlined alternative to is in some cases For example, consider the following program that uses is to prevent an invalid cast from occurring:

PhotoAlbum album = null; if (fileName != null) album = this.OpenAlbum(fileName);