CODEWITHSUNDEEP
.netwpfbinding
Nicros
Nicros

Reputation: 5183

Binding to two properties

I have an interesting scenario- I have a slider that needs to update a control immediately as its value is changed. All good there, easy.

But I would ALSO like it to do some additional work, but only after a delay. The .NET 4.5 delay property on bindings would be perfect, but now the slider value needs to have two bindings... one with a delay and one without.

Something like the equivalent of this:

<Slider value={Binding Path=Property1, Delay=500; Binding Path=Property2} />

I know this doesn't exist but it would be nice to have. But is there a way to do this using the new Delay prop from 4.5?

Upvotes: 1

Views: 85

Answers (1)

sa_ddam213
sa_ddam213

Reputation: 43596

Not sure if this will work but you could cheat a bit using MultiBinding with a dummy converter.

Something like:

xaml:

   <Window.Resources>
        <local:DummyConverter x:Key="Dummyconverter" />
    </Window.Resources>
    <Grid>
        <Slider >
            <Slider.Value>
                <MultiBinding Converter="{StaticResource Dummyconverter}" >
                    <Binding Path="Value1"  />
                    <Binding Path="Value2" Delay="500" />
                </MultiBinding>
            </Slider.Value>
        </Slider>
    </Grid>

Dummy Converter

public class DummyConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return values == null ? null : values[0];
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
    {
        return new object[] { value, value };
    }
}

Upvotes: 1

Related Questions