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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Note The following client project can be found in the Code06 folder under Web06_2K3. All demonstrations using 1.x of the Framework for this chapter use this project. You ll need to set up the Web06_2K3 directory as an IIS application using the Microsoft Management Console (MMC) configuration snap-in for IIS.
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To understand the enhancement in the .NET Framework 2.0, you have to understand the behavior in 1.x. To demonstrate the problematic behavior, you ll need to add a Web Reference to both services from a Visual Studio .NET 2003 client project, using the respective ASMX documents (see Figure 6-10).
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Figure 6-10. The Add Web Reference Wizard at work Notice we ve changed the Web Reference name from the default (localhost, in this case) to something more meaningful. This becomes the namespace that the proxy gets created within. After the wizard runs and generates the proxy, you have some types available in the Proxies.Web06 namespace; NumberLib (your service class) and PhoneNumber (the proxy type the GetNumber operation returns). Remember that PhoneNumber is the same type across the services on the server side of the equation. Its fully qualified name is WSDemo.PhoneNumber. On the proxy side, the PhoneNumber class is not the same type as on the server (see Figure 6-11). This is what it means to lose .NET type affinity and have schema type affinity instead. Only data is represented in schema (aka state information). The PhoneNumber types reflect this in their structure.
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Figure 6-11. The PhoneNumber server and proxy types compared The server type has the custom constructor and the FormattedNumber method, which are behaviors. It also has three properties, which are special case methods, and can, therefore, also be considered behaviors. Notice the only thing carried into the proxy type is the properties. Not only are the other members dropped, but the properties are transformed to fields (a problem for other reasons, which is also remedied in 2.0; see the Proxies Generate Fields and Not Properties section that follows). However, it still would be nice to use GetNumber on one service to get an instance of PhoneNumber to send to the SendSMS operation on the other service (even if they re only proxy types). Let s proceed with the plan to do this by adding another Web Reference to the service exposed by the Dialer.asmx file (see Figure 6-12).
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Figure 6-12. Adding another Web Reference to the same namespace from within Visual Studio .NET 2003
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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Again, we ve changed the Web reference name from the default to Proxies.WSDemo. This creates the proxy types needed for the second service in the same namespace, where you can hopefully share the definition of the PhoneNumber proxy type. However, as you ve probably anticipated (due to our subtle literary foreshadowing), your expectations will be met only with agony. Let s take a peek at the Web References in Solution Explorer (see Figure 6-13).
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Figure 6-13. The namespaces that actually get created in the project At this point your hopes are dashed. Each of these namespaces has a definition of the PhoneNumber proxy type. They re basically identical, as they re based on the same type information on the server, but they re completely different types as far as the CLR is concerned. One is named Proxies.Web06.PhoneNumber, the other Proxies.Web061.PhoneNumber. This means that no matter how hard you try, code like this won t work. Proxies.Web06.NumberLib l = new Proxies.Web06.NumberLib(); Proxies.Web061.Dialer d= new Proxies.Web061.Dialer(); Proxies.Web06.PhoneNumber p = l.GetNumber(); d.SendSMS(p,"wuzgoinon "); To fix this you could modify the generated proxy code. This is a valid technique, but the downside is that if you ever have to regenerate your proxy (should the service definition ever change), you d then have to reapply your proxy modifications. This can be a pain, especially during development, when the service might still be evolving via iterative design. The .NET Framework 2.0 addresses this problem. In the next example, doing everything the same, you ll only get a single proxy type on the client. The proxy generator is smart enough to see that the PhoneNumber type comes from the same namespace in both instances and only generate the type once.
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