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ValidationErrorEventArgs Class

July 28, 2014

Provides data for the BindingValidationError event.

System.Object
  System.EventArgs
    System.Windows.RoutedEventArgs
      System.Windows.Controls.ValidationErrorEventArgs

Namespace:  System.Windows.Controls
Assembly:  System.Windows (in System.Windows.dll)

public class ValidationErrorEventArgs : RoutedEventArgs

The ValidationErrorEventArgs type exposes the following members.

  NameDescription
Public propertyActionGets the state of the validation error.
Public propertyErrorGets the validation error that caused the BindingValidationError event.
Public propertyHandledGets or sets the value that marks the routed event as handled.
Public propertyOriginalSourceGets a reference to the object that raised the event. (Inherited from RoutedEventArgs.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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The BindingValidationError event is raised when the binding engine creates and removes a validation error.

The following example shows how to set a binding to catch validation errors. When a BindingValidationError event is reported, use the ValidationErrorEventArgs to present the error Action information graphically to the user.


private void StackPanel_BindingValidationError(object sender, 
    ValidationErrorEventArgs e)
{
    if (e.Action == ValidationErrorEventAction.Added)
    {
        MyTextBox.Background = new SolidColorBrush(Colors.Red);

    }
    else if (e.Action == ValidationErrorEventAction.Removed)
    {
        MyTextBox.Background = new SolidColorBrush(Colors.White);
    }
}



<StackPanel BindingValidationError="StackPanel_BindingValidationError" >
    <StackPanel.Resources>
        <my:Bills x:Name="MyBills"/>
    </StackPanel.Resources>

    <TextBlock 
        TextWrapping="Wrap"
        Text="To generate a validation error, input a negative number or a non-number and then tap the button."
    />

    <TextBox x:Name="MyTextBox" Width="50" Margin="10">
        <TextBox.Text>
            <Binding Mode="TwoWay" Source="{StaticResource MyBills}" 
                 Path="Amount" NotifyOnValidationError="true" 
                 ValidatesOnExceptions="true"/>
        </TextBox.Text>
    </TextBox>
    <Button Content="Tap to Update"/>
</StackPanel>


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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