Validation.ValidationAdornerSiteFor Attached Property

Updated: July 2008

Gets or sets the element for which this element appears to indicate that an error occurred.

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 GetValidationAdornerSiteFor, SetValidationAdornerSiteFor
<object Validation.ValidationAdornerSiteFor="DependencyObject" .../>

Property Value

Type: System.Windows.DependencyObject
The element for which this element appears to indicate that an error occurred.

Identifier field

ValidationAdornerSiteForProperty

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:

When you set one of the properties, the other property is set to the element on which you set the attached property; regardless of which of the previous options you choose, the Validation.ValidationAdornerSite for the TextBox is the Label and the ValidationAdornerSiteFor for the Label is the TextBox.

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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