BindingGroup.NotifyOnValidationError Property

 

Gets or sets whether the Validation.Error event occurs when the state of a ValidationRule changes.

Namespace:   System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

public bool NotifyOnValidationError { get; set; }

Property Value

Type: System.Boolean

true if the Validation.Error event occurs when the state of a ValidationRule changes; otherwise, false. The default is false.

The Validation.Error attached event occurs on the element that has the BindingGroup.

The following example creates a BindingGroup and sets NotifyOnValidationError to true so that the application can handle the Validation.Error event when a ValidationRule fails.

<StackPanel.BindingGroup>
  <BindingGroup NotifyOnValidationError="True">
    <BindingGroup.ValidationRules>
      <src:ValidateDateAndPrice ValidationStep="ConvertedProposedValue" />
    </BindingGroup.ValidationRules>
  </BindingGroup>
</StackPanel.BindingGroup>

The following example handles the Validation.Error event.

// This event occurs when a ValidationRule in the BindingGroup
// or in a Binding fails.
private void ItemError(object sender, ValidationErrorEventArgs e)
{
    if (e.Action == ValidationErrorEventAction.Added)
    {
        MessageBox.Show(e.Error.ErrorContent.ToString());

    }
}

.NET Framework
Available since 3.0
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