create barcodes in vb.net App class in C#.NET

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Listing 19.2 App class
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using System; ...Additional using statements... namespace WorldBrowser { public partial class App : Application { public DictionaryLookup Lookup { get; private set; }
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Automatic property with private setter
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private void Application_Startup(object sender, StartupEventArgs e) { Lookup = new DictionaryLookup(); Creates } instance
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Pretty straightforward. We ve added an automatic property with a private setter b and initialized it in the Startup method c. It s slightly less clear how we ve retrieved the property from elsewhere in our code because creation and navigation to other Windows and Pages is done for us, we can t easily pass a reference to the application around. Fortunately, WPF solves the problem for us by providing a static member called Current so that we can get hold of the application that way.
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Application.Current
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This approach is good, but it returns the base Application object; if we want to access our Lookup property, we ll have to cast
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((App)Application.Current).Lookup
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This is a little ugly. Instead, let s add our own static member to the App object that returns the proper type.
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public static new App Current { [System.Diagnostics.DebuggerStepThrough] get { return (App)Application.Current; } }
All we re doing here is adding a property called Current that does the cast for us. Note that we have to use the new keyword because we re using the same name as the static property of Application. Also, we ve added the DebuggerStepThrough attribute so that, when debugging, we don t constantly end up stepping into the property. Now, when we want to refer to the Lookup property, we can just do this:
App.Current.Lookup
Much better. Now, though, we need some UI to make use of our code.
19.1.3 Our WorldListView user control Up until now, we ve mostly been creating our UI in the main window. For simple applications, this is fine, but it isn t maintainable or extensible. In this application, we re going to create the bulk of our display in a user control called WorldListView. Why WorldListView Well, this will provide a list of countries that you can select. Later on, if we want to add, say, a WorldMapView, it would be easy to swap out the view or even allow the user to select between them. To get started, create a new UserControl (WPF) called WorldListView. We re going to make something that looks like figure 19.2. You ve probably noticed that the list on the left is a little bare. We re going to generate the list programmatically. Listing 19.3 shows the XAML for the WorldListView control.
Figure 19.2 The WorldListView user control. We ll add the list on the left programmatically.
Building the World Browser application Listing 19.3 The WorldListView user control
<UserControl x:Class="WorldBrowser.WorldListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="334" Width="551" Loaded="UserControl_Loaded"> <Grid> Grid with two <Grid.ColumnDefinitions> columns <ColumnDefinition Width="150" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> Place to <ScrollViewer Name="continentScrollViewer" hold list VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.ColumnSpan="1"> <StackPanel Name="continentStackPanel" /> FlowDocumentReader </ScrollViewer> for content <FlowDocumentReader Name="docReaderA" Grid.Column="1" Background="LightGoldenrodYellow"> <FlowDocument Background="LightGoldenrodYellow"> <Paragraph>Double-click on a country for details</Paragraph> </FlowDocument> Another FlowDocumentReader ! </FlowDocumentReader> <FlowDocumentReader Name="docReaderB" Grid.Column="1" Opacity="0" Background="LightBlue"/> </Grid> </UserControl>
There s nothing too outrageous here, we hope. The UI is primarily a Grid b with two columns. The first column, which will hold our list of countries, has a set width, and the second column takes up the remaining space. For our list, we ve put in a ScrollViewer c holding a StackPanel. We ll populate this list with a series of Expanders, but we re going to do this with code. (We ll explain why in a moment.) Next, we have a FlowDocumentReader d to hold the details of our country. And then we have another FlowDocumentReader e. Why One big reason for this application is to demonstrate transitions. To have a transition, we have to have something to transition from and something to transition to. We ll end up switching back and forth between the two FlowDocumentReaders.
19.1.4 Populating the country list As we mentioned before, we re going to populate our list of countries in code. We don t have to do this we could create a bunch of Expanders in XAML and put all the countries underneath them. But, this wouldn t be easy to maintain and update, and it definitely violates any reasonable data versus UI separation. We should go a step farther than we do; we re still putting the list of countries into the code-behind instead of inside some data provider. Again, from a real-world perspective, we should be reading in this list and providing it to the UI in a data container; it should be obvious by now how that would be done, and so we went cheap to save a little space. Listing 19.4 shows the relevant code from the WorldListView. xaml.cs file.
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