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Custom textbox validation

The task is to use IDataErrorInfo interface to control validation on a textbox(s). We will end up with something that looks like this:

then

then all you have to do is make the tooltip so that you can see what the error is:

<Window.Resources>
<Style TargetType=”{x:Type TextBox}”>
<Style.Triggers>
<Trigger Property=”Validation.HasError” Value=”true”>
<Setter Property=”ToolTip” Value=”{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}”/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
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Categories: WPF
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