Set WPF Binding.StringFormat Property on TextBox via Style

data-binding, wpf, wpf-style

Solution

you could probably bind the DataContext of the textbox rather than the text property

 <TextBox DataContext="{Binding Path=A}" />

and then use a setter like

<Style x:Name="mmtext" TargetType="TextBox" x:Key="mmtext">
    <Setter Property="Text" Value="{Binding Path=., StringFormat={}{0} mm}" />
</Style>

for a TwoWay binding you will need a converter anyways to get rid of the extra mms

Problem

I have an WPF application contains many `TextBox`es having different kind of Bindings which all share the same `StringFormat` property (its a technical application, the Textboxes should display values with units "xxx mm"...) I want to set up the Binding in the XAML/Designer, but I'd like to avoid setting the TextFormat property on every individual Binding. Is there a way to do this using Styles? If I try to set the Binding in a `Setter` for the Text property like ``` <Style x:Name="mmtext" TargetType="TextBox" x:Key="mmtext"> <Setter Property="Text" Value="{Binding Path=A,StringFormat={}{0} mm}" /> </Style> ``` I need to provide a `Path` in the Setters Value property, and I cannot define any binding in the XAML itself (as this would override the value set in the Style). Is there a way to set/modify only the `StringFormat` property in a single Binding (i.e. the Binding for the `Text` property) using a Style? Or do I need to look for templating or a custom control?

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