/// <summary>
/// Shows a validation failure.
/// </summary>
/// <param name="validationFailure">Information about the validation failure, including the element on which to show the validation and the validation result.</param>
public void ShowValidationFailure(ValidationElementResult validationFailure)
{
var errorTemplate = ValidationScope.GetValidationTemplate(validationFailure.Element);
if (errorTemplate != null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(validationFailure.Element);
if (adornerLayer != null)
{
validationFailure.Element.Loaded += Element_Loaded;
FocusExtensions.Monitor(validationFailure.Element);
var existingAdorner = validationFailure.Element.GetValue(ValidationErrorAdornerProperty) as TemplatedAdorner;
if (existingAdorner != null)
{
// Update the message displayed in the existing adorner
existingAdorner.DataContext = validationFailure.Result.Message;
}
else
{
var adorner = new TemplatedAdorner(validationFailure.Element, validationFailure.Result.Message, errorTemplate);
adornerLayer.Add(adorner);
validationFailure.Element.SetValue(ValidationErrorAdornerProperty, adorner);
}
}
}
}
/// <summary>
/// Removes the validation failure.
/// </summary>
/// <param name="validationFailure">Information about the validation failure, including the element on which to show the validation and the validation result.</param>
public void RemoveValidationFailure(ValidationElementResult validationFailure)
{
var adorner = validationFailure.Element.GetValue(ValidationErrorAdornerProperty) as Adorner;
if (adorner != null)
{
var adornerLayer = AdornerLayer.GetAdornerLayer(validationFailure.Element);
if (adornerLayer != null)
{
adornerLayer.Remove(adorner);
validationFailure.Element.SetValue(ValidationErrorAdornerProperty, null);
}
}
}
