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The implementation now provides a clear contract definition, void of implementation details, that is attributed as required to provide the automatic generation of the metadata (either WSDL or MEX). This separation, in the same source file, can appear elsewhere. How the contract is implemented, and ultimately bound, is managed through a configuration file or programmatically. For this example, and probably what is destined to be the norm, we do it via configuration. In the Web.config file for the WCF service, shown in Listing 4-6, the mapping between the type and the contract takes place through the <services> element inside the <system. serviceModel> section. Note the clear contract mapping to the implementation type, which is the interface definition. Listing 4-6. Web.config < xml version="1.0" > <configuration> <system.serviceModel> <services> <service name="MyService" behaviorConfiguration="returnFaults"> <endpoint contract="IMyInterface" binding="wsHttpBinding"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="returnFaults"> <serviceMetadata httpGetEnabled="true"/> <serviceDebug httpHelpPageEnabled="true" includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> If you launch this service in the ASP.NET development server, you ll see something different from Figure 4-2 because the URL will differ by the IP port in use for the project. The ASP.NET development server dynamically chooses the IP port, unless you ve overridden it. If you re using IIS, then the default port 80 is left off, and the URL appears as in Figure 4-2.

' Methods Function BeginTransaction() As IDbTransaction Function BeginTransaction(ByVal il As IsolationLevel) As IDbTransaction Sub ChangeDatabase(ByVal databaseName As String) Sub Close() Function CreateCommand() As IDbCommand Sub Open() ' Properties Property ConnectionString As String ReadOnly Property ConnectionTimeout As Integer ReadOnly Property Database As String ReadOnly Property State As ConnectionState End Interface

By convention, .NET interface types are prefixed with a capital letter I. When you are creating your own custom interfaces, it is considered a best practice to do the same.

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Be sure to check the Copy items into destination group s folder check box before clicking the Add button Once those images are in place, they ll be ready to use within your application code and nib files Next, we need to define the interface for our controller For now, we just want to set up enough to allow us to hook up the few components we need in the nib file As you saw in Figure 4 2, Dudel will contain a row of buttons that let the user select a drawing tool These buttons are actually instances of UIBarButtonItem, which will be placed on a UIToolbar We ll need to have an outlet for each button so that we can control its appearance, and we ll need an action for each button to trigger, all of which will be set up in Interface Builder.

Don t sweat the details of what these members actually do at this point. Simply understand that the IDbConnection interface defines a set of members that are common to all ADO.NET connection objects. Given this, you are guaranteed that each and every connection object supports members such as Open(), Close(), CreateCommand(), and so forth. Another example: the System.Windows.Forms namespace defines a class named Control, which is a base class to a number of UI widgets (DataGrid, Label, StatusBar, TreeView, etc.). The Control class implements an interface named IDropTarget, which defines drag-and-drop functionality: Public Interface IDropTarget ' Methods Sub OnDragDrop(ByVal e As DragEventArgs) Sub OnDragEnter(ByVal e As DragEventArgs) Sub OnDragLeave(ByVal e As EventArgs) Sub OnDragOver(ByVal e As DragEventArgs) End Interface Based on this interface, we can now correctly assume that any class that extends System.Windows. Forms.Control supports four subroutines named OnDragDrop(), OnDragEnter(), OnDragLeave(), and OnDragOver(). As we work through the remainder of this text, you will be exposed to dozens of interfaces that ship with the .NET base class libraries. As well, you will discover that you are free to implement these standard interfaces on your own custom classes and structures to define types that integrate tightly within the framework.

Figure 4-2. Viewing the WCF Hello, World service The initial difference when consuming ASP .NET web services vs. WCF services is the use of different client proxy generation tools. You ll see that step in the following sections using two different methods: Visual Studio 2005 integration and the SvcUtil.exe utility.

Given your work in 6, the interface type may seem functionally equivalent to abstract base classes. Recall that when a class is marked as abstract (via the MustInherit keyword), it may define any number of abstract members to define a polymorphic interface to all derived types. However, when a class type does define a set of abstract members, it is also free to define any number of constructors, field data, nonabstract members (with implementation), and so on.

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