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<TextBox Height="25" Margin="102,25,0,150" Name="txtISBN" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="100" /> <Button Height="23" Margin="250,25,12,150" Name="btnRequest" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="98" Click="btnRequest_Click">Send Request</Button> <Label Height="27" HorizontalAlignment="Left" Margin="15,0,0,137" Name="label4" VerticalAlignment="Bottom" Width="76">Event Log</Label> <ListBox Margin="12,0,12,12" Name="lstEvents" Height="130" VerticalAlignment="Bottom" FontStretch="Condensed" FontSize="10" /> </Grid> </Window> Then select the Design tab. The form should look like the one shown in Figure 9-5.
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Figure 9-5. The application window in design view The Request List is at the top of the form and will display all the incoming requests that need to be acted on. To send a request to another branch, use the fields in the middle of the form to specify the Author, Title, and ISBN; then click the Send Request button. The Event Log at the bottom will display messages from the workflow similar to the way the console app does.
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Implementing a TextWriter
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For the WriteLine activities that you have used so far, you have not set the TextWriter property. If no TextWriter is specified, the default behavior is to write the specified text to the console. Now you will implement a TextWriter class that will add this text to the Event Log at the bottom of your application form.
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First, you ll create a static class that will provide access to the application window. From the Solution Explorer, right-click the LibraryReservation project and choose Add, Class. For the class name, enter ApplicationInterface.cs. The implementation for this class is shown in Listing 9-2. Listing 9-2. Implementation of the ApplicationInterface Class using System; using System.Windows.Controls; using System.Activities; namespace LibraryReservation { public static class ApplicationInterface { public static MainWindow _app { get; set; } public static void AddEvent(String status) { if (_app != null) { new ListBoxTextWriter(_app.GetEventListBox()).WriteLine(status); } } } } The ApplicationInterface class has a static reference (_app) to the application window (the MainWindow class). The static AddEvent() method instantiates a ListBoxTextWriter class, which you ll implement later, and calls its WriteLine() method. Now open the Reservations.xaml.cs file and add the following namespaces: using using using using using using using using System.ServiceModel; System.ServiceModel.Activities; System.ServiceModel.Activities.Description; System.ServiceModel.Description; System.ServiceModel.Channels; System.Activities; System.Xml.Linq; System.Configuration;
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Add the following code to the constructor: ApplicationInterface._app = this; This will initialize the _app reference in the ApplicationInterface class. Because it is a static class, there will be only a single instance, and this instance will now have a reference to the MainWindow class. Add the following methods in the Reservations.xaml.cs file:
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public ListBox GetEventListBox() { return this.lstEvents; } private void AddEvent(string szText) { lstEvents.Items.Add(szText); } The GetEventListBox() method returns a reference to the actual ListBox control that will display these events. This method is used by the ApplicationInterface class. The AddEvent() method is used by the application when it needs to add an event.
Implementing ListBoxTextWriter
From the Solution Explorer, right-click the LibraryReservation project and choose Add, Class. Enter ListBoxTextWriter.cs for the class name. The implementation of this class is shown in Listing 9-3. Listing 9-3. Implementation of ListBoxTextWriter using using using using using using System; System.Collections.Generic; System.Linq; System.Text; System.IO; System.Windows.Controls;
namespace LibraryReservation { public class ListBoxTextWriter : TextWriter { const string textClosed = "This TextWriter must be opened before use"; private Encoding _encoding; private bool _isOpen = false; private ListBox _listBox; public ListBoxTextWriter() { // Get the static list box _listBox = ApplicationInterface._app.GetEventListBox(); if (_listBox != null) _isOpen = true; } public ListBoxTextWriter(ListBox listBox) { this._listBox = listBox; this._isOpen = true;
CHAPTER 9 n COMMUNICATING WITH THE HOST APPLICATION
} public override Encoding Encoding { get { if (_encoding == null) { _encoding = new UnicodeEncoding(false, false); } return _encoding; } } public override void Close() { this.Dispose(true); } protected override void Dispose(bool disposing) { this._isOpen = false; base.Dispose(disposing); } public override void Write(char value) { if (!this._isOpen) throw new ApplicationException(textClosed); ; this._listBox.Dispatcher.BeginInvoke (new Action(() => this._listBox.Items.Add(value.ToString()))); } public override void Write(string value) { if (!this._isOpen) throw new ApplicationException(textClosed); ; if (value != null) this._listBox.Dispatcher.BeginInvoke (new Action(() => this._listBox.Items.Add(value))); } public override void Write(char[] buffer, int index, int count) { String toAdd = ""; if (!this._isOpen) throw new ApplicationException(textClosed); ;
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