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Table 13.1 Property Last Name First Name Level
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CHAPTER 13 Employee class properties
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Input validation
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Description The employee s last (or family) name The employee s first (or given) name The employee s salary level This puts the employee into specific salary buckets. The salary, in USD, for this employee
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Salary
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Listing 13.1 Employee class to be used in the validation examples
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public class Employee : INotifyPropertyChanged { private string _lastName; public string LastName { get { return _lastName; } set { _lastName = value; NotifyPropertyChanged("LastName"); } } private string _firstName; public string FirstName { get { return _firstName; } set { _firstName = value; NotifyPropertyChanged("FirstName"); } } private int _level; public int Level { get { return _level; } set { _level = value; NotifyPropertyChanged("Level"); } } private decimal _salary; public decimal Salary { get { return _salary; } set {
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The validation example source and UI
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_salary = value; NotifyPropertyChanged("Salary"); } } #region INotifyPropertyChanged Members
PropertyChanged event
public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged(string propertyName) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } #endregion }
Property Changed helper code
You won t see validation in action unless you wire up some UI, so we ll build a basic user interface that works against a single instance of the Employee class. We ll keep it simple and use code-behind, but I refer you to chapter 16 for best practices on structuring your application using the ViewModel pattern. The XAML and C# for the UI are shown in listing 13.2.
Listing 13.2 User interface XAML and code-behind to use for validation examples XAML:
<UserControl x:Class="ValidationExample.MainPage" 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="190" Styles see d:DesignWidth="350"> chapter 23 <UserControl.Resources> <Style TargetType="TextBlock"> <Setter Property="VerticalAlignment" Value="Center" /> <Setter Property="HorizontalAlignment" Value="Right" /> <Setter Property="Margin" Value="4" /> </Style> <Style TargetType="TextBox"> <Setter Property="VerticalAlignment" Value="Center" /> <Setter Property="HorizontalAlignment" Value="Left" /> <Setter Property="Margin" Value="4" /> <Setter Property="Height" Value="22" /> <Setter Property="Width" Value="200" /> </Style> </UserControl.Resources> <Grid x:Name="LayoutRoot" Background="White" Margin="20"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="2*" /> </Grid.ColumnDefinitions>
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Input validation
<Grid.RowDefinitions> <RowDefinition Height="Auto" <RowDefinition Height="Auto" <RowDefinition Height="Auto" <RowDefinition Height="Auto" <RowDefinition Height="Auto" </Grid.RowDefinitions>
/> /> /> /> />
<TextBlock Grid.Row="0" Grid.Column="0" Text="Last Name" /> <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding LastName, Mode=TwoWay}" /> <TextBlock Grid.Row="1" Grid.Column="0" Text="First Name" /> <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding FirstName, Mode=TwoWay}" /> <TextBlock Grid.Row="2" Grid.Column="0" Text="Level" /> <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Level, Mode=TwoWay}" /> <TextBlock Grid.Row="3" Grid.Column="0" Text="Salary" /> <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding Salary, Mode=TwoWay}" /> <Button x:Name="SubmitButton" Grid.Row="4" Grid.Column="1" Content="Submit" Margin="4" HorizontalAlignment="Left" Width="100"/> </Grid> </UserControl>
Binding statements see chapter 11
public partial class MainPage : UserControl { private Employee _employee = new Employee(); public MainPage() { InitializeComponent(); Loaded += new RoutedEventHandler(MainPage_Loaded); } void MainPage_Loaded(object sender, RoutedEventArgs e) { this.DataContext = _employee; } }
The user interface includes four text boxes, each with a label. There s also a Submit button, but it s there just for aesthetic purposes; all of our validation will happen on lost focus (blur for you web folks). The resulting form should look like figure 13.1. Note that the Level and Salary both show 0; this shows that binding is working for those fields.
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Exception-based property validation
That sets up a basic single-entity data entry form we can use for the validation examples included in this chapter minus the ones specific to the DataForm and DataGrid. Throughout this chapter we ll modify various aspects of the Employee class, as well as the binding statements in the form XAML. As we move through the examples, it may be Figure 13.1 Runtime view of the validation form helpful to refer back to these listings. The first type of validation we ll look at is also the simplest and the one with the most history: exception-based validation.
13.2 Exception-based property validation
It wasn t well-known, but Silverlight 2 included basic validation capabilities. With the release of Silverlight 3, these capabilities became more advanced, so we now have the ability to validate bound data and display appropriate error messages using the builtin controls in a standardized and easy to template way. The binding syntax continues to use the ValidatesOnExceptions parameter to enable the display of validation messages when a property setter raises an exception, but the built-in control templates have been updated to provide appropriate display of error state. Though no longer widely used, it s worth covering exception-based validation for those times when it really is the most appropriate approach. It s also necessary to understand so you can respond to the built-in type validation exceptions. In this section, we ll look at the basics of using exception-based validation both for your own errors and built-in system errors and then move on to custom validation code and combining multiple validation messages. We ll wrap up this section with a look at the built-in Validation UI in Silverlight, something that applies to all forms of validation.
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