Question

I have looked through all the answers provided on this website for an answer to my problem and I couldn’t find a working solution.

I have a combobox that is bound to a Class using the ItemsSource Property.

The Class Definition is as follows:

public class DataSource
{
    public string DisplayField { get; set; }
    public string ValueField { get; set; }
}

The ComboBox is bound to display the data using the DisplayMemberPath = “DisplayField” and the SelectedValuePath = “ValueField”… This is done in the code behind and loaded when the Window Loads.

The ComboBox is defined as follows:

<ComboBox Grid.Row="0" Grid.Column="1" Margin="5 5 5 0" Name="releaseHoldDropDown" Width="100"/>  

I need a way to change the background to Green and the Foreground to White if the value of the drop down changes to “Release”.

I also need to change the background to Red and the Foreground to White if the value of the drop down changes to “Hold”.

FYI: I am using the ExpressionLight.xaml theme to style the application as a whole.

As a side note I also want a way to change the background on ALL my Comboboxes from the Grey to White to make them more readable. So I need to modify the ExpressionLight.xaml but I have no idea which part to edit to make those changes.

Any Help Will be Appreciated.

thank you

Answer 1

why not use a style.trigger?

        <ComboBox.Style>
            <Style TargetType="ComboBox">
                <Setter Property="Background" Value="Transparent"/>
                <Setter Property="Foreground" Value="Black"/>
                <Style.Triggers>
                    <Trigger Property="SelectedValue" Value="Release">
                        <Setter Property="Background" Value="Green"/>
                        <Setter Property="Foreground" Value="White"/>
                    </Trigger>
                    <Trigger Property="SelectedValue" Value="Hold">
                        <Setter Property="Background" Value="Red"/>
                        <Setter Property="Foreground" Value="White"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </ComboBox.Style>

this could be a start for you