Is possible bind sometime value sometime resource?

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I have the necessity to change the brush on the rectangle on the change of double value.

The problem is that sometimes the brush is value and sometime is dynamic resource.

Whit "Application.Current.Resources" it's possible take the actual value but i have the necessity to bind the resource to control (for esemple to obj.SetResourceReference). It's possible?

What I have tried:

VB.NET

Private Class ColorConv
    Implements IValueConverter

        Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.Convert
            Dim s As Brush

            If value =0 Then
                s = Brushes.red
            Else
                 s = Application.Current.Resources("myResources")
            End If

            Return s
    End Function

    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
            Return 0
    End Function
End Class

Posted 16-May-16 22:56pm

Member 9504129

Updated 18-May-16 2:13am

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2 solutions

Solution 1

Sounds like a job for a DataTrigger[^]:

XML

<Rectangle>
    <Rectangle.Style>
        <Style>
            <Setter Property="Fill" Value="{DynamicResource myResources}" />
            
            <Style.Triggers>
                <DataTrigger Binding="{Binding myValue}" Value="0">
                    <Setter Property="Fill" Value="Red" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Rectangle.Style>
</Rectangle>

Trigger, DataTrigger & EventTrigger[^]
Triggers in WPF[^]

Posted 17-May-16 2:07am

Richard Deeming

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Member 9504129 · Accepted Answer · 2016-05-18T02:13:00

With bind style works

C#

BindingOperations.SetBinding(myLed, Rectangle.StyleProperty, myBinding)

When create the style if hacve the resurce use DynamicResourceExtension

Dim dynamicResource = New DynamicResourceExtension(mybrush)
GetStyle.Setters.Add(New Setter(Rectangle.FillProperty, dynamicResource))