pass Validation error to UI element in WPF?
- by Tony
I am using IDataErrorInfo to validate my data in a form in WPF. I have the validation implemented in my presenter.
The actual validation is happening, but the XAML that's supposed to update the UI and set the style isn't happening.
Here it is:
<Style x:Key="textBoxInError" TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={x:Static RelativeSource.Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
The problem is that my binding to Validation.Errors contains no data. How do I get this data from the Presenter class and pass it to this XAML so as to update the UI elements?
EDIT:
Textbox:
<TextBox Style="{StaticResource textBoxInError}" Name="txtAge" Height="23" Grid.Row="3" Grid.Column="0" HorizontalAlignment="Right" VerticalAlignment="Center" Width="150">
<TextBox.Text>
<Binding Path="StrAge" Mode="TwoWay"
ValidatesOnDataErrors="True"
UpdateSourceTrigger="PropertyChanged"/>
</TextBox.Text>
The validation occurs, but the style to be applied when data is invalid is not happening.
