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Design Patterns for Building Message-Oriented Web Services
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Figure 3-3. The Visual Studio .NET XML Designer, showing the StockTrader XSD schema
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The XML Designer includes toolbox elements that you can drag onto the surface of the designer and then fill in, as shown in Figure 3-4. For example, it provides a toolbox element for XML complex types. Simply drag this element onto the designer and provide a name for the complex type. Then start specifying the included types by their name and type. Once you are finished defining all of the types, switch to the XML view to view the resulting XML. You can then copy and paste the XML into a notepad file, and save it with an .xsd extension.
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Figure 3-4. The Visual Studio .NET XML Designer Toolbox
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You do not need to build the XML message documents by hand because they are created as part of the WSDL document, which Visual Studio .NET will automatically generate. But you will need to code the abstract method definitions in an interface definition file so that the WSDL generator knows what XML messages to create. The interface definition file contains type definitions and abstract method definitions.
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The Role of the Interface Definition Class File
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The interface definition class file contains two important sets of information: Class definitions for all custom types that are exchanged by the Web service Abstract class definitions for each operation that the Web service supports Listing 3-4 provides the code for an interface definition class file for the RequestQuote operation and its associated types.
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Design Patterns for Building Message-Oriented Web Services
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Listing 3-4. The Interface Definition Class File for the RequestQuote Operation and Its Associated Types
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using System; using System.Web.Services; using System.Web.Services.Description; using System.Web.Services.Protocols; using System.Xml.Serialization; namespace StockTrader { public abstract class StockTraderStub : System.Web.Services.WebService { public abstract Quote RequestQuote(string Symbol); } [XmlTypeAttribute(Namespace= "http://www.bluestonepartners.com/schemas/StockTrader/")] public class Quote { public string Symbol; public string Company; public string DateTime; public System.Double High; public System.Double Low; public System.Double Open; public System.Double Last; public System.Double Change; public System.Double PercentChange; public System.Double Previous_Close; public System.Double High_52_Week; public System.Double Low_52_Week; } }
Notice the following important points: The definition file includes one stub class that encapsulates all operations, and then any number of additional classes for the data types.
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The interface definitions for the operations are enclosed within an abstract class called StockTraderStub. The stub class derives from the System.Web.Services.WebService class, so it can be implemented in a Web service. In this listing it contains a single abstract function definition for the RequestQuote operation. The definition file contains a separate class definition for the Quote type. This is how you are able to reference the Quote type from code-behind. The definition file only contains class definitions for custom types (such as Quote), not for simple elements such as Symbol, which is a standard string (as qualified in the http://www.w3.org/2001/XMLSchema namespace). I make special mention of this because it may appear inconsistent with our earlier XSD schema file that includes an element definition for Symbol. But it is not inconsistent because the xsd.exe compiler resolves the Symbol element to a standard string, which therefore requires no special entry in the interface definition file.
NOTE You may be confused by the difference between abstract classes versus interfaces. An interface is a completely abstract set of members with no implementation logic. However, an abstract class supports implementations in its methods (although it is not required). Abstract classes are useful because they provide the benefits of interfaces combined with the convenience of reusable code.
XML Serialization Attributes
The interface definition classes are decorated with XML serialization attributes that bind the classes to specific namespaces, attributes, and elements in the XSD schema file. Consider, for example, the following:
[return: XmlElement("Quote", Namespace = "http://www.bluestonepartners.com/schemas/StockTrader/")] public abstract Quote RequestQuote(string Symbol);
This unambiguously states that the RequestQuote operation returns an object of type Quote, as qualified in the http://www.bluestonepartners.com/schemas/StockTrader/ namespace. In fact, this namespace is documented liberally throughout the interface definition file. It can never appear too often because XML messages must be as unambiguous as possible. XML and SOAP serialization attributes give you direct control over the way in which the XML messages get serialized within the request and response SOAP
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