Referencing DrawingImage in a binding.

Maximilien

I'm not certain what I have to google for. I have Drawing images in an resource file like this : I can use them like this : Now, I want to be able to bind the image source and conditionally choose the image in the Code-Behind. I'm not certain how I reference the image in the code ? Is this a DrawingImage ? How do I load it in the code ? public DrawingImage ChooseIcon { get { if (useFindIcon) { return ???; // how to reference the static resource "FindIcon" } else if (useSearchIcon) { return ???;// how to reference the static resource "SearchIcon" } } } Thanks. Max.

CI/CD = Continuous Impediment/Continuous Despair

Richard Deeming

The view-model shouldn't really know anything about your resources. I'd suggest having an enum to represent the icon you want to display. Bind the source to that enum, and use a converter to convert the value to the relevant image. Eg:

public enum ChooseIcon
{
Find,
Search,
}

public class YourViewModel
{
private ChooseIcon _chooseIcon;

public ChooseIcon ChooseIcon
{
    get { return \_chooseIcon; }
    set { SetProperty(ref \_chooseIcon, value); }
}

}

public class ChooseIconConverter : IValueConverter
{
public ImageSource FindIcon { get; set; }
public ImageSource SearchIcon { get; set; }

public object Convert (object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    switch ((ChooseIcon)value)
    {
        case ChooseIcon.Find: return FindIcon;
        case ChooseIcon.Search: return SearchIcon;
        default: return null;
    }
}

public object ConvertBack (object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
    return Binding.DoNothing;
}

}

<Window.Resources>
<local:ChooseIconConverter
x:Key="ChooseIconConverter"
FindIcon="{StaticResource FindIcon}"
SearchIcon="{StaticResource SearchIcon}"
/>
</Window.Resources>
...
<Image Source="{Binding ChooseIcon, Mode=OneWay, Converter={StaticResource ChooseIconConverter}}" />

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

Maximilien

Thanks. Will look at that. I also bodge a hack by having 2 Image tags and add a Visibility binding.

CI/CD = Continuous Impediment/Continuous Despair

Maximilien

Awesome, it's working. :rose:

CI/CD = Continuous Impediment/Continuous Despair