How to implement scroll gesture?

we can implement click, double click event by adding TapGestureRecognizer like this
scrollContent.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(Content_DoubleClicked),
NumberOfTapsRequired = 2
} );
scrollContent.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(Content_Clicked),
NumberOfTapsRequired = 1
} );

then, How to capture scroll event for a scrollview?