WPF: Slider with an event that triggers after a user drags

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Besides using the Thumb.DragCompleted event you can also use both ValueChanged and Thumb.DragStarted, this way you don’t lose functionality when the user modifies the value by pressing the arrow keys or by clicking on the slider bar.

Xaml:

<Slider ValueChanged="Slider_ValueChanged"
    Thumb.DragStarted="Slider_DragStarted"
    Thumb.DragCompleted="Slider_DragCompleted"/>

Code behind:

private bool dragStarted = false;

private void Slider_DragCompleted(object sender, DragCompletedEventArgs e)
{
    DoWork(((Slider)sender).Value);
    this.dragStarted = false;
}

private void Slider_DragStarted(object sender, DragStartedEventArgs e)
{
    this.dragStarted = true;
}

private void Slider_ValueChanged(
    object sender,
    RoutedPropertyChangedEventArgs<double> e)
{
    if (!dragStarted)
        DoWork(e.NewValue);
}

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