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Now let s take a closer look at data binding using a WebDeveloper object. This will be a TwoWay data binding scenario, where changes done to the user interface will be reflected in the data source and vice versa. Figure 6-1 shows an interface where the same data is shown twice.
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Figure 6-1. TwoWay data binding example In the top half, the user interface elements (in this case, text boxes) are bound to the data source. Any changes made to these text boxes are reflected in the data source. You can verify this by clicking the Show Data Source Contents button after modifying a value. The lower half lets you change the data source directly. When you click the Update Data Source button, the values in the data source will be updated directly and the corresponding fields in the top half will automatically change. The following XAML shows how the upper half of the user interface is put together and how the Binding markup extension is used on several of the user interface elements in the lower half of the user interface. <UserControl x:Class="chapter6.TwoWayDataBindingDemo" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400">
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CHAPTER 6 WORKING WITH DATA
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<StackPanel x:Name="LayoutRoot" Background="White"> <Border BorderBrush="Black" BorderThickness="2" Grid.Row="1"> <StackPanel Orientation="Vertical"> <TextBlock Text="User Interface" FontSize="16" HorizontalAlignment="Center"/> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="First Name:"/> <TextBox x:Name="firstNameTextBox" Text="{Binding FirstName, Mode=TwoWay}" Width="140"/> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Last Name:"/> <TextBox x:Name="lastNameTextBox" Width="140" Text="{Binding LastName, Mode=TwoWay}"/> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Email:"/> <TextBox x:Name="emailTextBox" Width="140" Text="{Binding Email, Mode=TwoWay}"/> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Website:"/> <TextBox x:Name="websiteTextBox" Width="140" /> </StackPanel> <Button x:Name="btnViewDataSourceButton" Margin="5" Width="155" Content="Show Data Source Contents" Click="btnViewDataSourceButton_Click"/> </StackPanel> </Border> <StackPanel Orientation="Vertical"> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="First Name:"/> <TextBox x:Name="dsFirstNameTextBox" Width="140"/> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Last Name:"/> <TextBox x:Name="dsLastNameTextBox" Width="140" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Email:"/> <TextBox x:Name="dsEmailTextBox" Width="140" /> </StackPanel> <StackPanel Orientation="Horizontal" HorizontalAlignment="Center"> <TextBlock Text="Website:"/> <TextBox x:Name="dsWebsiteTextBox" Width="140" /> </StackPanel> <Button x:Name="btnUpdateDataSource" Margin="5" Width="155" Content="Update Data Source " Click="btnUpdateDataSource_Click"/> </StackPanel> </StackPanel> </UserControl>
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The lower half of the user interface is similar but uses no data binding. An instance of WebDeveloper wd is created at the class level of this page and then connected when the page loads via the Loaded event handler. void TwoWayDataBindingDemo_Loaded(object sender, RoutedEventArgs e) { wd.FirstName = "Ashish"; wd.LastName = "Ghoda"; wd.Email = "aghoda@TechnologyOpinion.com"; wd.Website = "www.TechnologyOpinion.com"; LayoutRoot.DataContext = wd; //Binding in code-behind Binding dataBinding = new Binding("Website"); dataBinding.Source = wd; dataBinding.Mode = BindingMode.TwoWay; websiteTextBox.SetBinding(TextBox.TextProperty, dataBinding); //lower half controls dsFirstNameTextBox.Text = wd.FirstName; dsLastNameTextBox.Text = wd.LastName; dsEmailTextBox.Text = wd.Email; dsWebsiteTextBox.Text = wd.Website; } Note that here we demonstrated how to create the data binding completely code-behind. If you look at the XAML again, you ll notice that the websiteTextBox doesn t use the Binding markup extension. Instead, the property name is set in the Binding constructor, the data source is linked, and then the data is bound by setting the TextProperty dependency property to the Binding instance. This is almost everything we need to completely enable TwoWay data binding.
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If you assemble the code as is, you ll discover that direct changes to the data source are not reflected immediately in the user interface. This is because the data binding system isn t aware that the data source changed. In order to provide this notification, the object being used as the data source must implement the INotifyPropertyChanged interface. This interface defines a single event PropertyChanged that must be provided. Let s modify the WebDeveloper class to implement this interface. public class WebDeveloper: INotifyPropertyChanged { private string firstName; private string lastName; private string email; private string website; public string FirstName { get
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CHAPTER 6 WORKING WITH DATA
{ return firstName; } set { firstName = value; RaisePropertyChanged("FirstName"); } } public string LastName { get { return lastName; } set { lastName = value; RaisePropertyChanged("LastName"); } } public string Email { get { return email; } set { email= value; RaisePropertyChanged("Email"); } } public string Website { get { return website; } set { website = value; RaisePropertyChanged("Website"); } } public event PropertyChangedEventHandler PropertyChanged; public void RaisePropertyChanged(string propertyName) { if (PropertyChanged!=null) {
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