How can I skip checking for disabled items?

Question

I am new to WPF. In our current project, we have added validation rules for all data entry fields for which we need validation. We also copied code (also located elsewhere here on stackoverflow) that recursively iterates over all the bindings and their validation rules to see if all the data is valid before the data is saved.

This is our code, which, in my opinion, is the place to solve our problem:

Public Function ValidateBindings(ByVal parent As DependencyObject) As Boolean
  Dim valid As Boolean = True
  Dim localValues As LocalValueEnumerator = parent.GetLocalValueEnumerator

  While localValues.MoveNext
   Dim entry As LocalValueEntry = localValues.Current
   If BindingOperations.IsDataBound(parent, entry.Property) Then
    Dim binding As Binding = BindingOperations.GetBinding(parent, entry.Property)
    For Each rule In binding.ValidationRules
     Dim result As ValidationResult = rule.Validate(parent.GetValue(entry.Property), Nothing)
     If Not result.IsValid Then
      Dim expression As BindingExpression = BindingOperations.GetBindingExpression(parent, entry.Property)
      Validation.MarkInvalid(expression, New ValidationError(rule, expression, result.ErrorContent, Nothing))
      valid = False
     End If
    Next
   End If
  End While

  For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(parent) - 1
   Dim child As DependencyObject = VisualTreeHelper.GetChild(parent, i)

   If Not ValidateBindings(child) Then
    valid = False
   End If
  Next

  Return valid
 End Function

I tried to figure out how to use the dependency GetValue()property , but my attempts have so far failed. Can someone help me with this or this wrong way of thinking to solve this problem?IsEnabledPropertyparent

, " ", , .

Binding.NotifyOnValidationError Binding XAML, IsEnabled NotifyOnValidationError, , DependencyProperty.

, , , ElementIsEnabled , - XAML:

    <Binding.ValidationRules>
        <local:MustContainInteger ElementIsEnabled="{Binding SameBindingAsIsEnabled}" />
     </Binding.ValidationRules>

, ElementIsEnabled DependencyProperty DependencyObject.

, .

Answer 1

.NET 4 ValidationRule x:Reference:

public class MustContainInteger : ValidationRule
{
    public UIElement Element { get; set; }

    // ...
}

<TextBox Name="testtb">
    <TextBox.Resources>
        <!-- Definition in resources necessary because of cyclical dependency -->
        <vr:MustContainInteger x:Key="Rule" Element="{x:Reference testtb}" />
    </TextBox.Resources>
    <TextBox.Text>
        <Binding Path="TestString">
            <Binding.ValidationRules>
                <StaticResource ResourceKey="Rule" />
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

, , Element.IsEnabled Validate.