Posts from September 2009

Sep
7
2009

WPF: TextBox Error Notification Through Style


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Posted in Programming and WPF

By default, WPF doesn’t provide any visual indication when ValidationRules aren’t met for TextBoxes. When I was learning WPF, I read a post about providing error notification for TextBoxes through the user of a style. I can’t find the article/post, but it never worked properly for me so I’ve modified and fixed what I had. This only works if there are ValidationRules bound to the TextBox, and it only displays the first failed rule.

<style TargetType="{x:Type TextBoxBase}" x:Key="{x:Type TextBox}">
  <setter Property="Margin" Value="2" />
  <setter Property="SnapsToDevicePixels" Value="True"/>
  <setter Property="OverridesDefaultStyle" Value="false"/>
  <setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
  <setter Property="FocusVisualStyle" Value="{x:Null}"/>
  <setter Property="MinWidth" Value="80"/>
  <setter Property="MinHeight" Value="20"/>
  <setter Property="AllowDrop" Value="true"/>
  <setter Property="Background" Value="{StaticResource WindowBackgroundBrush}" />
  <setter Property="BorderBrush" Value="{StaticResource SolidBorderBrush}" />
  <setter Property="Template">
...
</setter></style>

The rest is after the jump.

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