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Validation.ValidationAdornerSite Attached Property

Updated: July 2008

Gets or sets the element that appears to indicate that a validation error occurred on the bound element where this property is set.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

See GetValidationAdornerSite, SetValidationAdornerSite
<object Validation.ValidationAdornerSite="DependencyObject" .../>

Property Value

Type: System.Windows.DependencyObject
The element that appears to indicate that a validation error occurred on the bound element.

Identifier field

ValidationAdornerSiteProperty

Metadata properties set to true

None

The Validation.ValidationAdornerSite and Validation.ValidationAdornerSiteFor attached properties reference each other, and you can set either one. For example, suppose that a Label displays validation errors that occur on a data-bound TextBox. You can do one of the following to establish that relationship:

The following example uses a Label as the adorner site for the validation errors that occur on items in an ItemsControl. The example sets the Validation.ValidationAdornerSite for each item container in the ItemContainerStyle to the label. The example uses the Validation.ValidationAdornerSiteFor property to get the item container that has the error and binds the Content of the Label to the first ValidationError that is reported. For the entire example, see Validate an Item in an ItemsControl Sample.

<ItemsControl Name="customerList"  ItemTemplate="{StaticResource ItemTemplate}"
              ItemsSource="{Binding}">
  <ItemsControl.ItemBindingGroup>
    <BindingGroup>
      <BindingGroup.ValidationRules>
        <src:AreasMatch/>
      </BindingGroup.ValidationRules>
    </BindingGroup>
  </ItemsControl.ItemBindingGroup>
  <ItemsControl.ItemContainerStyle>
    <Style TargetType="{x:Type ContentPresenter}">
      <Setter Property="Validation.ValidationAdornerSite"
              Value="{Binding ElementName=validationErrorReport}"/>
    </Style>
  </ItemsControl.ItemContainerStyle>
</ItemsControl>


...


<Label Name="validationErrorReport" 
       Content="{Binding RelativeSource={RelativeSource Self}, 
       Path=(Validation.ValidationAdornerSiteFor).(Validation.Errors)[0].ErrorContent}"
       Margin="5" Foreground="Red" HorizontalAlignment="Center"/>

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5 SP1, 3.0 SP2

Date

History

Reason

July 2008

Added topic for new member.

SP1 feature change.

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