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Zack
Zack

Reputation: 2859

How could I bind a SolidColorBrush's Color property in a ResourceDictionary to a ViewModel Color property

I have a wpf Window that is using a ResourceDictionary that has a SolidColorBrush defined in it.

I can choose what color to set the SolidColorBrush as with it's Color property, by using the hex values like so: 

<SolidColorBrush Color="#FF0000"/>

When I try to set it like this:

<SolidColorBrush Color="{Binding UserSelectedColor}"/>

It will obviously not work because a ResourceDictionary does not have a DataContext to set.

I tried to do this because I thought that maybe the Binding would use whatever DataContext is set on the Control that is using the SolidColorBrush, but that doesn't seem to be working.

So I'm wondering how am I supposed to get the Color from the ViewModel if I can't set the DataContext of the ResourceDictionary

Upvotes: 1

Views: 4436

Answers (1)

Clemens
Clemens

Reputation: 128136

A possible solution would be to also put the ViewModel object into the ResourceDictionary and explicitly set the Source of the binding:

<Window ...>
    <Window.Resources>
        <local:ViewModel x:Key="ViewModel"/>
        <SolidColorBrush x:Key="UserSelectedBrush"
            Color="{Binding UserSelectedColor, Source={StaticResource ViewModel}}"/>
    </Window.Resources>
    <Grid DataContext="{StaticResource ViewModel}">
        <Rectangle Fill="{StaticResource UserSelectedBrush}"/>
    </Grid>
</Window>

It would however be easier to declare a UserSelectedBrush property of type Brush in the ViewModel and directly bind to that property:

<Rectangle Fill="{Binding UserSelectedBrush}"/>

Upvotes: 4

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