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The polymorphic interface established by a parent class suffers from one major limitation in that only derived types are forced to support a set of members However, in larger systems, it is very common to develop multiple class hierarchies that have no common parent beyond SystemObject Given that abstract members in an abstract base class only apply to derived types, we have no way to configure types in different hierarchies to support the same polymorphic interface As you would guess, interface types come to the rescue When you define an interface, they can be implemented by any type, in any hierarchy, within any namespaces Given this, interfaces are highly polymorphic By way of a simple example, consider a standard NET interface named ICloneable This interface defines a single method named Clone(): Public Interface ICloneable Function Clone() As Object End Interface If you were to examine the NET Framework 2.

Now that you have a service, it s time to define a client for that service. So, add a C# console application, and place the implementation code in a separate file as part of the ASP .NET application. The following is part of the Example03 sample code. Proxy Generation: Using the Visual Studio 2005 Add-In Similar to ASP .NET proxy creation, if you right-click the project in the IDE, you ll see three options for adding references. Select Add Service Reference, as shown in Figure 4-3.

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0 SDK documentation, you would find that a large number of seemingly unrelated types (SystemArray, SystemDataSqlClientSqlConnection, System OperatingSystem, SystemString, etc) all implement this interface type Although these types have no common parent (other than SystemObject), we can treat them polymorphically via the ICloneable interface type Another limitation of traditional abstract base classes is that each and every derived type must contend with the set of abstract members and provide an implementation In fact, the only way that a type can ignore abstract members is if the derived class is also defined as abstract (aka MustInherit) To see the problem, recall the shapes hierarchy we defined in 6 Assume we wish to define an abstract method in the Shape base class named GetNumberOfPoints(), which allows the derived type to return the number of points required to render the shape: Public MustInherit Class Shape ...

We ll also create an outlet to point at a DudelView instance, which will be initialized when the nib file is loaded Last but not least, we ll declare our class to conform with the DudelViewDelegate protocol, so that Interface Builder will let us hook it up Open DudelViewControllerh and add the code shown in bold..

Public MustOverride Function GetNumberOfPoints() As Byte End Class Clearly, the only type that has any points in the first place is Hexagon However, with this update, every derived type (Circle, Hexagon, and ThreeDCircle) must now provide a concrete implementation of this function even if it makes no sense to do so Again, the interface type provides a solution If we were to define an interface that represents the behavior of having points, we could simply plug it into the Hexagon type, leaving Circle and ThreeDCircle untouched..

Figure 4-3. Adding a reference to a WCF service This menu option is a wrapper around the SvcUtil.exe utility, actually spawning a process with the necessary parameters. Once you ve selected the Add Service Reference option, you ll see the Add Service Reference dialog box, as shown in Figure 4-4.

In the framework of .NET, the System.IO namespace is the region of the base class libraries devoted to file-based (and memory-based) input and output (I/O) services. Like any namespace, System.IO defines a set of classes, interfaces, enumerations, structures, and delegates, most of which are contained in mscorlib.dll. In addition to the types contained within mscorlib.dll, the System.dll assembly defines additional types of the System.IO namespace (given that all Visual Studio 2005 projects automatically set a reference to both assemblies, you should be ready to go). Many of the types within the System.IO namespace focus on the programmatic manipulation of physical directories and files. However, additional types provide support to read data from and write data to string buffers as well as raw memory locations. To give you a road map of the functionality in System.IO, Table 18-1 outlines the core (nonabstract) classes. Table 18-1. Key Members of the System.IO Namespace

These types allow you to store and retrieve primitive data types (integers, Booleans, strings, and whatnot) as a binary value. This type provides temporary storage for a stream of bytes that may be committed to storage at a later time. These types are used to manipulate a machine s directory structure. The Directory type exposes functionality primarily as shared methods. The DirectoryInfo type exposes similar functionality from a valid object variable. This type (new to .NET 2.0) provides detailed information regarding the drives on a given machine. These types are used to manipulate a machine s set of files. The type exposes functionality primarily as shared methods. The FileInfo type exposes similar functionality from a valid object variable. Continued

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