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Before you can do anything with annotations, you need to enable the annotation service with the help of an AnnotationService and AnnotationStream object. In the example shown in Figure 28-17, it makes sense to create the AnnotationService when the window first loads. Creating the service is simple enough you just need to create an AnnotationService object for the document reader and call AnnotationService.Enable(). However, when you call Enable() you need to pass in an AnnotationStore object. The AnnotationService manages the information for your annotations, while the AnnotationStore manages the storage of these annotations. Here s the code that creates and enables annotations: // A stream for storing annotation. private MemoryStream annotationStream; // The service that manages annotations. private AnnotationService service; protected void window_Loaded(object sender, RoutedEventArgs e) { // Create the AnnotationService for your document container. service = new AnnotationService(docReader); // Create the annotation storage. annotationStream = new MemoryStream(); AnnotationStore store = new XmlStreamStore(annotationStream); // Enable annotations. service.Enable(store); } Notice that in this example, annotations are stored in a MemoryStream. As a result, they ll be discarded as soon as the MemoryStream is garbage collected. If you want to store annotations so they can be reapplied to the original document, you have two choices. You can create a FileStream instead of a MemoryStream, which ensures the annotation data is written as the user applies it. Or you can copy the data in the MemoryStream to another location (such as a file or a database record) after the document is closed.

Next, you ll add a new behavior to the configuration file. In WCF, the extensibility mode provides for four types of behaviors: service behaviors, endpoint behaviors, contract behaviors, and operation behaviors. In this case, you are applying a behavior to the endpoint. You do this by adding a behaviors section to app.config. Here, you will include a named endpoint behavior named CachedInformationCardTokenBehavior. Within the behavior, you will include a reference for a default certificate. So, add the following XML within the System.ServiceModel section of the app.config file: <behaviors> <endpointBehaviors> <behavior name='CachedInformationCardTokenBehavior'> <CachedInformationCardClientCredentials> <serviceCertificate> <authentication trustedStoreLocation='LocalMachine' revocationMode='NoCheck'/> <defaultCertificate findValue='www.fabrikam.com' storeLocation='LocalMachine' storeName='My' x509FindType='FindBySubjectName' /> </serviceCertificate> </CachedInformationCardClientCredentials> </behavior> </endpointBehaviors> </behaviors>

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Tip If you aren t sure whether annotations have been enabled for your document container, you can use the static AnnotionService.GetService() method and pass in a reference to the document container. This method returns a null reference if annotations haven t been enabled yet.

At some point, you ll also need to close your annotation stream and switch off the AnnotationService. In this example, these tasks are performed when the user closes the window: protected void window_Unloaded(object sender, RoutedEventArgs e) { if (service != null && service.IsEnabled) { // Flush annotations to stream. service.Store.Flush(); // Disable annotations. service.Disable(); annotationStream.Close(); } } This is all you need to enable annotations in a document. If there are any annotations defined in the stream object when you call AnnotationService.Enable(), these annotations will appear immediately. However, you still need to add the controls that will allow the user to add or remove annotations. That s the topic of the next section.

{ return _dataAccessLayer.SaveCustomer(_name.Title, _name.FirstName, _name.Surname, _address.Street, _address.City, _address.State, _address.ZipCode, _emailAddress); } public bool Update() { // ... } public bool Delete() { // ... } #endregion #region Fields private private private private private } Notice that the DataAccessLayer has been refactored and is no longer a static class. It now has two parts, an interface (IDataAccessLayer) and the implementation that is provided to the Customer class. One of these implementations is likely to be something along the lines of SQLServerDatabase, which provides an implementation that saves Customer objects to a SQL Server database. Now the tests can be rewritten to provide their own minimal IDataAccessLayer implementation that does not access a database. All such dependencies should be mocked. Listing 7 6. The Unit Test that uses a Mocked Version of the IDataAccessLayer [Test] public void Customer_Can_Be_Saved() { MockRepository mocks = new MockRepository(); IDataAccessLayer dataAccessLayer = mocks.StrictMock<IDataAccessLayer>(); Customer customer = new Customer(dataAccessLayer, /* . . . */); Expect.Call(dataAccessLayer.SaveCustomer(/* . . . */).Return(1); mocks.ReplayAll(); Assert.Equals(customer.Save(), 1); mocks.VerifyAll(); } Listing 7 6 shows a unit test that asserts that the Customer class Save method calls the IDataAccessLayer s SaveCustomer method and passes in the correct parameters. This is achieved using RhinoMocks StrictMock, which disallows calls to any methods other than those that have been explicitly expected. The SaveCustomer method is then mocked so that, regardless of the parameters passed in, it will return the integer value 1 . IDataAccessLayer _dataAccessLayer; int _ID; Name _name; Address _address; EmailAddress _emailAddress;

Tip Every document container can have one instance of the AnnotationService. Every document should have its own instance of the AnnotationStore. When you open a new document, you should disable the AnnotationService, save and close the current annotation stream, create a new AnnotationStore, and then reenable the AnnotationService.

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