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Listing 11.12 PageDirectory business object
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[Serializable] public class PageDirectory { public PageDirectory() { } public PageDirectory(string name) { Name = name; pages = new ObservableCollection<WikiPage>(); } private string collectionName; public string Name { get { return collectionName; }
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Creates WikiPage collection
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The fa ade pattern presents a single unified interface that represents an entire subsystem.
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set { collectionName = value; } } private ObservableCollection<WikiPage> pages; public ObservableCollection<WikiPage> Pages { get { return pages; } set { pages = value; } } }
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Exposes WikiPage collection
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At the moment, the PageDirectory is pretty simple it only has a name and the collection of WikiPages. We expose the WikiPage collection in order to be able to bind to it. We have limited control over what s added and when, but we could rectify that by using a more involved collection, or by subscribing to the events on the collection and preventing unwanted operations (such as adding a page with the same name as an existing page).
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11.5.3 Create a model fa ade Now that we have our business objects, we need a model fa ade. The fa ade is a single point of entry for the presentation layer to deal with our business layer, and can be created easily as a resource in the XAML. This is like our Library class from before, but will use ObservableCollections of business objects rather than ADO.NET objects. As with the Library class, we will need to implement our own INotifyPropertyChanged interface, although the ObservableCollections we will be hosting implement the interface themselves, so we don t need to do anything special with them (listing 11.13).
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Listing 11.13 The Wiki fa ade
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[Serializable] public class Wiki : INotifyPropertyChanged { private string wikiDataFile = "wikiPages.xml"; public Wiki() { if (!File.Exists(wikiDataFile)) { CreateDefaultDirectory(); Save(); } else { Load(); Or loads } existing file }
Creates default file on first run
private void CreateDefaultDirectory() { wikiDirectories = new ObservableCollection<PageDirectory>(); wikiDirectories.Add(new PageDirectory("Home")); }
Binding to business objects
private ObservableCollection<PageDirectory> wikiDirectories; public ObservableCollection<PageDirectory> Directories { get { return wikiDirectories; } } private PageDirectory currentDirectory; public PageDirectory CurrentDirectory Currently selected { directory get { return currentDirectory; } set { currentDirectory = value; NotifyPropertyChanged("CurrentDirectory"); } } Adds new page
Collection of directories
public void AddPage() { CurrentDirectory.Pages.Add(new WikiPage("New Page")); } public void AddDirectory() Adds new directory { PageDirectory newDirectory = new PageDirectory(Guid.NewGuid().ToString()); Directories.Add(newDirectory); CurrentDirectory = newDirectory; } public void Load() Loads from XML file { XmlSerializer serializer = new XmlSerializer(typeof(ObservableCollection<PageDirectory>)); using (FileStream stream = new FileStream(wikiDataFile, FileMode.Open)) { if (stream.CanRead) { wikiDirectories = (ObservableCollection<PageDirectory>)serializer.Deserialize(stream); NotifyPropertyChanged("Directories"); } } } Saves to
to directory
public void Save() { XmlSerializer serializer = new XmlSerializer(typeof(ObservableCollection<PageDirectory>)); using (FileStream stream = new FileStream(wikiDataFile, FileMode.Create)) { serializer.Serialize(stream, wikiDirectories); } Property }
XML file
public event PropertyChangedEventHandler PropertyChanged;
Change event
Data binding with WPF
private void NotifyPropertyChanged(String propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } }
The Wiki object represents the core of our application. When first instantiated, it either creates a default, empty Wiki b or loads existing data c. It contains a collection of PageDirectory objects d where each directory contains some number of WikiPages. It also keeps track of the currently selected directory e. For functionality, the Wiki object allows a new page to be added to the current directory f or an entirely new directory to be created g. Because we re exposing default collections, the caller of the code could violate our business rules, and that s something that we would address in a more fleshed-out example. The Wiki object also can read h and write i itself out to an XML file. This might be a reasonable representation for a single-user application, or it might need to pass a representation of itself to a DAL for storage in a database. Again, in a more fleshed-out example, the Wiki object wouldn t know about how it was stored it would pass a representation to the code that does. We also implement the INotifyPropertyChanged interface and expose the PropertyChanged event j to let subscribers know when something has changed. We re on the home stretch now. All we need to do is tie our business objects to the UI.
11.5.4 Wiring business objects to presentation objects As we did with the Library, we need to make our Wiki business layer available to the presentation. Figure 11.13 shows what s bound to whom. Before we can bind to the business objects, we need to create an instance. We ll do this via XAML. In App.xaml, we add the local namespace (as with previous examples) and the following resource:
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