WPF slider thumb.DragCompleted

I'm learning from Mark Heath course of NAudio. I'm using a slider with the event:

Thumb.DragCompleted="SilderPositionOnDragCompleted"

And in the c#:

private void SilderPositionOnDragCompleted(object sender, System.Windows.Controls.Primitives.Thumb.DragCompleted e)
    {
            if (reader != null)
            {
                reader.CurrentTime = TimeSpan.FromSeconds(slider.Value);
            }
    }

I'm pretty sure that I wrote wrong the:

System.Windows.Controls.Primitives.Thumb.DragCompleted

Because I have no idea what I need to write in there - I saw this here in the site.

are the errors:

What do I need to do?

Thanks!

Solution

Try this:

private void SilderPositionOnDragCompleted(object sender, RoutedEventArgs e)
{
    if (reader != null)
    {
        reader.CurrentTime = TimeSpan.FromSeconds(slider.Value);
    }
}

The type of the second argument should be RoutedEventArgs.

And if you are hooking up the event handler programmatically you should use the following syntax:

Thumb.DragCompleted += SilderPositionOnDragCompleted;

...where "Thumb" is the name of your Thumb:

<Thumb x:Name="Thumb" />

Thumb Thumb = ...;