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Data binding lets you connect properties of any .NET object to properties of user interface elements. The syntax looks pretty similar to template binding. Example 20-25 shows a simple form with a couple of text entry fields, both using data binding to hook up to a source object.
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<Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> </Grid.ColumnDefinitions>
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<Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <TextBlock VerticalAlignment="Center" Text="Name:" /> <TextBox Grid.Column="1" Text="{Binding Path=Name}" /> <TextBlock VerticalAlignment="Center" Grid.Row="1" Text="Age:" /> <TextBox Grid.Column="1" Grid.Row="1" Text="{Binding Path=Age}" /> </Grid>
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Just as template bindings refer to properties on the target control, so these data binding expressions refer to properties on some source object. Data sources don t need to be anything special Example 20-26 shows an extremely simple class that will work just fine as the data source for Example 20-25.
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public class Person { public string Name { get; set; } public double Age { get; set; } }
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The code behind can create an instance of this type, and then make it available to the binding expressions in our user interface by putting it in the DataContext property as Example 20-27 shows.
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public partial class MainPage : UserControl { private Person source = new Person { Name = "Ian", Age = 36 }; public MainPage() { InitializeComponent(); } this.DataContext = source;
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}
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As you can see from Figure 20-15, the UI displays the two properties from the source object thanks to data binding. This may not seem any more convenient than just writing code to set the Text properties of the two TextBox elements directly, but data binding can do a little more than that. When the user types new values into the text boxes, the source Person object s properties get updated with those new values. If we were to modify the Person class to implement the INotifyPropertyChanged interface a
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common way to provide notification events anytime a property changes data binding would detect changes in the data source and update the UI automatically. Arguably the most important benefit of this kind of data binding is that it provides an opportunity to separate your application logic from your UI code. Notice that our Person class doesn t need to know anything about the user interface, and yet the data it holds is connected to the UI. It s much easier to write unit tests for classes that don t require a user interface simply to run.
A classic rookie mistake with WPF and Silverlight is to write code that relies too much on UI elements an example would be to use TextBox elements as the place you store your data. That might seem like a simplifying step why add a class to remember the Name and Age when the UI can remember them for us But that would mean any code that needed to access that data would have to read it out of the UI elements. This causes two problems: first, it makes it hard to change anything in the user interface without breaking the whole program, and second, it makes it impossible to test any individual part of the program in isolation. So while the separation illustrated with this example may seem excessive, for any nontrivial application it turns out to be very useful to keep the UI code completely separate from the rest of the code, hooking things together only via data binding. This tends to lead to code that is much easier to maintain than programs where a lot of the code deals directly with user interface elements. Example 20-25 uses just a couple of ad hoc binding expressions in a user interface, but there s a slightly more structured and very powerful data binding feature you can use with item controls: data templates.
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