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Recall that when we created the VB 6.0 CoCar, we defined and implemented a custom COM interface named IDriverInfo, in addition to the automatically generated default interface (_CoCar) created by the VB 6.0 compiler. When our Main() method creates an instance of CoCar, we only have direct access to the members of the _CoCar interface, which as you recall will be composed by each public member of the COM class: ' Here, you are really working with the [default] interface. myCar.Create(50, 10, CarType.BMW) Given this fact, in order to invoke the driverInfo property of the IDriverInfo interface, we must explicitly cast the CoCar object to an IDriverInfo interface as follows:

' Set name of driver. Dim itf As IDriverInfo itf = CType(myCar, IDriverInfo) itf.driverName = "Fred" Console.WriteLine("Drive is named: {0}", itf.driverName) Recall, however, that when a type library is converted into an interop assembly, it will contain Class-suffixed types that expose every member of every interface. Therefore, if you so choose, you could simplify your programming if you create and make use of a CoCarClass object, rather than a CoCar object. For example, consider the following subroutine, which makes use of members of the default interface of CoCar as well as members of IDriverInfo: Sub UseCar() Dim c As New CoCarClass() ' This property is a member of IDriverInfo. c.driverName = "Mary" ' This method is a member of _CoCar. c.SpeedUp() End Sub

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.NET uses attributes throughout the framework. Attributes permeate many aspects of how your types are hosted by the .NET CLR. Things such as Code Access Security (CAS) and general assembly metadata all depend upon attributes that are part of the generated MSIL. This is one of the declarative aspects of .NET. The ASP.NET 2.0 web service model relies as well on class- and method-level attributes that control how the .NET Framework manages the runtime support of web services through the request-reply cycle. For the most part, the declarative model remains the same when moving to WCF. According to the WCF product team, this was somewhat intentional to help the migration and transition of both existing ASP.NET 2.0 web services and developers to the WCF model. That initial transition started with the introduction of Web Services Enhancements (WSE) from version 1.0 up through version 3.0. In fact, the transition from out-of-the-box ASP.NET 2.0 web services to WSE web services required no change from a coding perspective. All WSE required was the modification of the application (Web.config) file that the site was hosted on, in addition to a recompile to bind to the updated assemblies that were part of the WSE distributions.

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Remember, because the Class-suffixed types are hidden by default, they will not appear in the Visual Studio 2005 IntelliSense.

If you are wondering exactly how this single type is exposing members of each implemented interface, check out the list of implemented interfaces and the base class of CoCarClass using the Visual Studio 2005 Object Browser (see Figure 17-14).

WCF supports schema-first and contract-first development as well. This might sound like a new model in the .NET world, but it was possible under ASP .NET 1.1 web services as well; it just required some discipline to follow and implement. The paradigm also existed in the COM world; but again, discipline was required and tool support was limited, and we all need to get things done, right WCF offers the tools and framework support to provide the malleability of an implementation and definition that allows service architects to view what they implement from either the outside in or the inside out. The primary tool you ll use in WCF is SvcUtil.exe. We ll introduce how to use SvcUtil.exe in this chapter, but 5 covers it in more detail.

As you can see, this type implements the hidden _CoCar and _IDriverInfo interfaces and exposes them as normal public members.

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