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Although useful in their own ways, the as and is operators simply test the compatibility of two types Often, you will need to obtain information about a type To do this, C# supplies the typeof operator It retrieves a SystemType object for a given type Using this object, you can determine the type s characteristics The typeof operator has this general form: typeof(type) Here, type is the type being obtained The Type object returned encapsulates the information associated with type Once you have obtained a Type object for a given type, you can obtain information about it through the use of various properties, fields, and methods defined by Type Type is a large class with many members, and a discussion is deferred until the next section, where reflection is examined However, to briefly demonstrate Type, the following program uses three of its properties: FullName, IsClass, and IsAbstract To obtain the full name of the type, use FullName IsClass returns true if the type is a class IsAbstract returns true if a class is abstract

then construct the Exception object, unravel the call stack and clean up any objects as required, plus locate the appropriate catch block for the particular exception The fact that exception clean up can impact a program s performance is one more reason to ensure that you throw exceptions only for truly exceptional conditions Common problems or situations should be handled through the use of an error code As a case in point, this is one reason why file-related read and write methods in the NET Framework do not raise an exception when the end of a file is reached Back to our code, this discussion tells us that our use of try and catch here should not affect our performance very much since we do not normally expect an exception to occur other than when opening an invalid album.

// Demonstrate typeof using System; using SystemIO; class UseTypeof { static void Main() { Type t = typeof(StreamReader); ConsoleWriteLine(tFullName); if(tIsClass) ConsoleWriteLine("Is a class"); if(tIsAbstract) ConsoleWriteLine("Is abstract"); else ConsoleWriteLine("Is concrete"); } }

This program outputs the following:

We could improve the performance if we kept track of the invalid albums during the OnLoad method, since then we would not need to re-open these albums again here We will not actually do this here, but it was worth a mention The remainder of the previous code is fairly self-explanatory One other point worth mentioning is our use of the Tag property This works well in our DisplayAlbumProperties method since all we need to keep track of is the album s file name It is also possible here to assign a PhotoAlbum instance to the Tag property rather than a string instance, although this requires extra memory and other resources to maintain the album for each item in memory An alternative approach often used to track more complex relationships is to derive a new class from the ListViewItem class.

17:

For our application, an excerpt of such a class might look something like the code shown in listing 141 Since this class is a ListViewItem object, instances of it can be assigned to and manipulated within the ListView control Whenever the PhotoAlbum object for an album is required, a list view item can be downcast to the PhotoAlbumListItem class, where the Album property and other members may be used to manipulate the album..

This program obtains a Type object that describes StreamReader It then displays the full name, and determines if it is a class and whether it is abstract

Reflection is the feature that enables you to obtain information about a type The term reflection comes from the way the process works: A Type object mirrors the underlying type that it represents To obtain information, you ask the Type object questions, and it returns (reflects) the information associated with the type back to you Reflection is a powerful mechanism because it allows you to learn and use the capabilities of types that are known only at runtime Many of the classes that support reflection are part of the NET Reflection API, which is in the SystemReflection namespace Thus, you will normally include the following in programs that use reflection:

Listing 14.1 Example deriving a new class from ListViewItem (not our approach)

using SystemReflection;

Notice the evolution of Jim s magic box for the 1993 Ford Ranger in Figure 10-40 Everything controller, junction box, heat sinks, and fans is packaged in a protective metal enclosure that is now centrally mounted above the motor in the engine compartment With everything in one box, you just have to connect a few wires the conversion is even easier to do and is much more reliable an operation

public class PhotoAlbumListItem : ListViewItem, IDisposable { private string _fileName; private PhotoAlbum _album; PhotoAlbumListItem(string file) { _fileName = file; _album = null; } public void Dispose() { // Dispose implementation . . . } public PhotoAlbum Album