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CHAPTER 6 SOA IN .NET: WEB SERVICES
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to look at each type as it s described by the schema in the WSDL and generate a proxy type to represent it. Now, before it does that, it gives you a chance to override that behavior and check what the proxy generating code is about to do. If you recognize the type represented in schema as one you already know, you can generate your own code instead of relying on the proxy generator to do this for you. So in your case, when the proxy generator alerts you that it s about to generate a proxy type to represent the PhoneNumber, you ll intercede and say No, no, I know this guy, here, here, use this type instead . Piece of cake. The steps to affect this change are as follows: 1. Create a type that inherits from the SchemaImporterExtension type. 2. Override ImportSchemaType, a method that fires every time the proxy code generator is processing a type from the WSDL document. 3. Write code to check the name and namespace of the type described in the schema of the WSDL document, and when it s a type you know, generate the proxy code yourself instead of relying on the generated code. 4. Give your type a strong name and put it in the Global Assembly Cache (GAC). 5. Register the extension to the proxy generation process in the machine.config of the developer workstation where you re generating the client side proxy. 6. Use Add Web Reference or wsdl.exe to generate the proxy. 7. Stand back and marvel at your ingenuity. In the example we ve created, you re going to generate a proxy that uses the real NumberLib.PhoneNumber type instead of the generated proxy type. This allows you to call custom constructors and the methods available on this type, instead of just having the state of an instance represented within the proxy type. Keep in mind that the assembly containing the type you re substituting must get to the client via some means other than the Web Service. On the wire you re still passing plain old XML. You re modifying what the client proxy does with the XML once the SOAP message containing the response is pulled off the wire by customizing the process that generates the client-side proxy code. First, let s take a closer look at the type definition you ll be replacing the proxy code for. You control the namespace of the type on the wire using the XmlRoot attribute on the type definition. You ll search for the same namespace used here in your proxy generator extension. [XmlRoot("phoneNumber", Namespace = "http://phoneNumber/", IsNullable = true)] public class PhoneNumber { Next, you create a type that inherits from SchemaImporterExtension. This type lives in the System.Xml.Serialization.Advanced namespace. You re searching in this code for the PhoneNumber type as it s represented on the wire.
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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public class PhoneNumberSchemaImporterExtension : SchemaImporterExtension { public override string ImportSchemaType(string name, string ns, XmlSchemaObject context, XmlSchemas schemas, XmlSchemaImporter importer, CodeCompileUnit compileUnit, CodeNamespace mainNamespace, CodeGenerationOptions options, CodeDomProvider codeProvider) { //Searching for the type name and the namespace we set with XmlRoot if (name.Equals("PhoneNumber") && ns.Equals("http://phoneNumber/")) { compileUnit.ReferencedAssemblies.Add("SchemaImp.dll"); mainNamespace.Imports.Add(new CodeNamespaceImport("NumberLib")); return "NumberLib.PhoneNumber"; } else return null; } } The ImportSchemaType method will be called for every type processed by the proxy generator. Only when you find your type do you take action by adding a reference to the assembly where the PhoneNumber type lives, adding an imports for the namespace, and returning the fully qualified name of the type to the proxy generator. For all other types you return null, which causes the generator to continue with its default behavior. Assign a license file so your type gets a strong name, compile the code, and put the resulting assembly in the GAC. It has to be in the GAC, because you re not modifying behavior within the context of a project, you re modifying it on the entire machine. The type has to be in the GAC so that wsdl.exe or Visual Studio .NET can find it from wherever the developer is generating proxy code. Because it s a machine-wide behavior you re changing, you also have to make an entry in the machine.config. Make this entry as a child of the configuration element, but after configsections. <system.xml.serialization> <schemaImporterExtensions> <add name="PhoneNumber" type="SchemaImp.PhoneNumberSchemaImporterExtension, SchemaImp, Version=... </schemaImporterExtensions> </system.xml.serialization>
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