How to detect : scrolling - up or down?

问题:

System.Windows.Forms.Form has only one scroll event-Scroll, but it is necessary to recognize scrolling up and scrolling down.Could you tell me,how to do this?

回答1:

Use the passed System.Windows.Forms.ScrollEventArgs arguments' OldValue and NewValue properties to detect the scroll direction.

回答2:

private void dgv_Scroll(object sender, ScrollEventArgs e)
        {
            if (e.OldValue > e.NewValue)
            {
                // here up
            }
            else
            {
                // here down
            }
        }

回答3:

Checkout ScrollEventArgs Class and this answer.