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SILVERLIGHT INTRODUCTION
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MoviesList.Add(Movie1); MoviesList.Add(Movie2); MoviesList.Add(Movie3); } public void CreateBinding_programmatically() { //Creates a binding programmatically Binding NewBinding = new Binding("Now"); NewBinding.Source = System.DateTime.Now; NewBinding.Mode = BindingMode.OneWay; txtBoundProgrammatically.SetBinding(TextBox.TextProperty, NewBinding); } } 8. 9. All you now need to do is link MainMenu to the data binding test page. Open ~/MainMenu.xaml.cs. Add the following code to the MainMenu_Loaded() method in MainMenu.xaml.cs: this.cmdDataBind.Click += new RoutedEventHandler(cmdDataBind_Click); 10. Add a method to the click event of the data bind button: void cmdDataBind_Click(object sender, RoutedEventArgs e) { PageNavigator.LoadPage(new DataBinding.DataBindingTest()); } 11. Press F5 to run the application. You should see two text boxes: the first displays the current time and date, and the other displays The Terminator (item 0 in MoviesList). So what have you done here First, you created a binding programmatically: //Creates a binding programmatically public void CreateBinding_programmatically() { //Creates a binding programmatically Binding NewBinding = new Binding("Now"); NewBinding.Source = System.DateTime.Now; NewBinding.Mode = BindingMode.OneWay; txtBoundProgrammatically.SetBinding(TextBox.TextProperty, NewBinding); } You then set the source (value) to today s date and then linked the binding to the txtBoundProgrammatically text box. To bind the TextBox txtDeclaration declaratively, first set the data context with the following code: txtDeclaration.DataContext = MoviesList[0]; Set the Text property of the text box as follows: <TextBox x:Name="txtDeclaration" Width="300" Text="{Binding Title, Mode=OneWay}" Height="20" ></TextBox>
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SILVERLIGHT INTRODUCTION
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In the preceding example, you bound a TextBox to the Title property of Movie and defined the binding mode as one way: <TextBox x:Name="txtDeclaration" Width="300" Text="{Binding Title, Mode=OneWay}" Height="20" ></TextBox> Silverlight offers three binding modes: OneTime: This is the lightweight option and should be used if the value will never change from what it is initialized as. OneWay: If the item the object is bound to is changed, the bound property will be updated as well. If you change the bound property, it will not affect the object it is bound to. TwoWay: Like OneWay binding, but any changes to the bound property will also alter the bound object.
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Data Binding and Dependency Properties
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As mentioned earlier, data binding uses dependency properties to maintain the relationship between the object and datasource. If you change an item that is databound then any other controls bound to the data item will change as well. Let s create an example to demonstrate this. 1. 2. Open ~/DataBinding/DataBindingTest.xaml. Add the following XAML after the TextBox that has the x:name set to txtDeclaration: <TextBlock>Change an object in list:</TextBlock> <Button x:Name="cmdChangeTitle" Width="100" Height="20" Content="Change Title"></Button> 3. Open DataBindingTest.xaml.cs and add a click event handler: this.cmdChangeTitle.Click+=new RoutedEventHandler(cmdChangeTitle_Click); 4. Add a method to handle the click: void cmdChangeTitle_Click(object sender, RoutedEventArgs e) { //Change an item in the list MoviesList[0].Title = "Title Changed"; } 5. Press F5 to run the application. Click the button to change the movie title. The text box that was bound to this item will then change.
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Note that the contents of the text box that is bound was automatically updated when you changed the class it was bound to.
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Two-Way Binding
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You will now create an example to demonstrate two-way data binding. 1. 2. Open DataBindingTest.xaml. Add the following XAML after the cmdChangeTitle button (note that the binding mode is set to TwoWay now): <TextBlock>Two way binding:</TextBlock> <TextBox x:Name="txtTwoWay" Width="300" Text="{Binding Title, Mode=TwoWay}" Height="20" > </TextBox> 3. Open DataBindingTest.xaml.cs. In DataBindingTest_Loaded()()add the following code (after the call to PopulateItems()) to bind the text box txtTwoWay to the first item in the movie list: //Set up two way binding txtTwoWay.DataContext = MoviesList[0]; 4. 5. 6. 7. Press F5 to run your application. Click the DataBinding button and select the text box labelled txtTwoWay. Change the text to The Terminator 2 . Click another text box.
Notice how all the other items bound to this movie were updated. The other bound items were updated in the example when the focus changed to another control. But you don t even need to change the item s focus because Silverlight will update other bound properties automatically after about 20 seconds.
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