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Validation in Windows Presentation Foundation

, 19 Aug 2006
In this article, I'll walk you through using the built-in Validation classes that exist in Windows Presentation Foundation. I'll then discuss an alternative approach to validation that might suit a richer domain layer, by creating a custom WPF ErrorProvider.
<Window x:Class="PaulStovell.Samples.WpfValidation.AdvancedWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:PaulStovell.Samples.WpfValidation" 
	Title="Simple Validation" Height="300" Width="300" WindowState="Maximized"
    >

	<!-- 
	See App.xml for the ErrorTemplate style applied to these TextBoxes. 
	-->

	<Border Padding="50">
		<StackPanel>
			<TextBlock>
				To see validation using ValidationRules, change the App.xaml's StartupUri to SimpleWindow.xaml.
			</TextBlock>

			<local:ErrorProvider>
				<StackPanel>
					<TextBox Text="{Binding Path=Name, UpdateSourceTrigger=PropertyChanged}" Width="200" Margin="5" />
					<TextBox Text="{Binding Path=Address, UpdateSourceTrigger=PropertyChanged}" Width="200" Margin="5" />
				</StackPanel>
			</local:ErrorProvider>
			
		</StackPanel>
	</Border>
</Window>

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About the Author

Paul Stovell
Octopus Deploy
Australia Australia
My name is Paul Stovell. I live in Brisbane and develop an automated release management product, Octopus Deploy. Prior to working on Octopus I worked for an investment bank in London, and for Readify. I also work on a few open source projects. I am a Microsoft MVP for Client Application Development.
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