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The ProjectData class offers a clear, abstract, and formal interface to the caller that is separate from the interface of Project itself. The ProjectData class is a data transfer object (DTO). This means that it is composed purely of public read-write properties, with no internal code. In other words, this class should exactly match the code created by Visual Studio when it creates a proxy class for a web service. In fact, if you are using XSD schemas to define the XML transferred to and from the caller, you can generate this class using the xsd.exe command line utility. In PTWebService, I wrote the class by hand, and it looks like this: public class ProjectData { private Guid _id; private string _name; private string _started; private string _ended; private string _description; private List<ProjectResourceData> _resources = new List<ProjectResourceData>(); public Guid Id { get { return _id; } set { _id = value; } } // other properties go here } You can get the complete code from the download for this book. Not only does this class include properties corresponding to those of Project, but it also includes a List<ProjectResourceData> field. I ll discuss this later, as this class will also be used by GetProjectList() and GetProject(). As you can see, component-based methods like AddProject() are relatively easy to implement. They simply accept a set of strongly typed parameters, potentially call Security.Login() and then let the business objects do all the hard work. The code in AddProject() relies on the fact that the
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CHAPTER 11 s WEB SERVICES INTERFACE
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Project object will throw exceptions for any authorization violations, and that its Save() method will throw an exception if the object s validation rules are violated by the data provided from the consumer. Now let s move on to look at service-oriented, message-based web method implementations.
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Service-Oriented Web Methods
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As discussed earlier, the primary definition of a service-oriented web method is that it accepts and returns messages. These messages are typically XML structures, but within .NET they are represented as strongly typed classes. You can create these classes by hand, or generate them from an XSD schema by using the xsd.exe command line utility. The service-oriented web methods in PTWebService include the following: GetProjectList() GetProject() GetResourceList() GetResource() They all work essentially the same way, and so I ll only walk through two of them in this chapter: GetProjectList() and GetProject(). It is important to realize that even though my examples in this chapter focus on retrieving data, you can use service-oriented techniques to implement methods like AddProject() (described earlier). AddProject() could just as easily have accepted a single message, rather than a long list of parameters, as it does in this chapter. Similarly, the GetProject() implementation shown following could accept strongly typed parameters rather than a request message. My point is that you can switch between models, and the code in this chapter is primarily intended to show you how to implement each approach so you can choose which is appropriate for your application.
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GetProjectList
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The GetProjectList() web method is intended to return a list of the projects in the ProjectTracker application. A consumer application can use this data however it wishes, and this method will allow anonymous access with no authentication. Recall that the ProjectList business object applies no authorization rules, and both the PTWin and PTWeb interfaces allow anonymous users access to the list of projects (and the list of resources through ResourceList). This method provides an opportunity to see the simplest message-based implementation, and also demonstrates how to create a web method that doesn t use the custom authentication mechanism implemented earlier: [WebMethod(Description="Get a list of projects")] public ProjectData[] GetProjectList() { // anonymous access allowed Security.UseAnonymous(); try { ProjectList list = ProjectList.GetProjectList(); List<ProjectData> result = new List<ProjectData>(); foreach (ProjectInfo item in list)
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