Question

I have a Grid control that I’d like to set the margin properties of in XAML and have them be pulled from SystemInformation.CaptionHeight. I’ve figured out how to do it in C# but I’d like to do it in XAML.

I haven’t used resources to set things like this before but I’ve tried variations like

<Grid>
   <Grid.Margin>
      <Thickness Top="{StaticResource {x:Static Forms:SystemInformation.CaptionHeight}}" Left="5" Right="5" Bottom="5" />
   </Grid.Margin>
</Grid>

and

<Grid>
   <Grid.Margin>
      <Thickness Top="{x:Static Forms:SystemInformation.CaptionHeight}" Left="5" Right="5" Bottom="5" />
   </Grid.Margin>
</Grid>

but to no avail. How do I dynamically set attributes like this at runtime?

Answer 1

Using a Binding, but specify that the Source is static and point it to the location of your property

Also, Thickness.Top is not a DependencyProperty, so you can not bind it. Your best alternative would be to bind Grid.Margin using a Converter, which takes the double value and converts it to a Thickness property.

<Grid Margin="{Binding 
          Source={x:Static Forms:SystemInformation.CaptionHeight},
          Converter={StaticResource MyDoubleToMarginConverter}}" />