/// <summary>
/// Called when the value of a validating property changes.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">Event arguments.</param>
private static void DependencyProperty_ValueChanged(object sender, EventArgs e)
{
DependencyObject dependencyObject = (DependencyObject)sender;
DependencyProperty?property = ValidatingPropertyBehavior.GetValidatingProperty(dependencyObject);
if (property != null)
{
dependencyObject.Validate(property);
}
}
/// <summary>
/// Validate that a value of a dependency object/property combination does not violate any binding validation rules.
/// </summary>
/// <param name="dependencyObject">The dependency object.</param>
/// <param name="dependencyProperty">The dependency property.</param>
private static void Validate(this DependencyObject dependencyObject, DependencyProperty dependencyProperty)
{
BindingExpressionBase bindingExpression = BindingOperations.GetBindingExpressionBase(dependencyObject, dependencyProperty);
if (bindingExpression == null)
{
return;
}
switch (bindingExpression.ParentBindingBase)
{
case Binding binding:
ValidatingPropertyBehavior.Validate(dependencyObject.GetValue(dependencyProperty), binding.ValidationRules, bindingExpression);
break;
case MultiBinding multiBinding:
ValidatingPropertyBehavior.Validate(dependencyObject.GetValue(dependencyProperty), multiBinding.ValidationRules, bindingExpression);
break;
}
}