WPF Mouse down event no Coordinates

问题

I am using WPF mouse down event on a control. I want to get the X,Y coordinates but I am getting an error:

private void button_MouseDown(object sender, MouseButtonEventArgs e)
{
      double x = e.X, double y = e.Y;
}

I could not access the coordinates. I wonder why. Can Someone help? If mouse down is unable to get the coordinates, is there other way I can get the coordinate of the cursor when click?

回答1:

You need to use the GetPosition method to retrieve the point.

private void button_MouseDown(object sender, MouseButtonEventArgs e)
{
    Point p = e.GetPosition(this);
    double x = p.X;
    double y = p.Y;
}

回答2:

Try like

C#
private void button_MouseDown(object sender, MouseButtonEventArgs e)
    {
        double x = e.GetPosition("Name of your element" as IInputElement).X;
    }

来源：https://stackoverflow.com/questions/17420835/wpf-mouse-down-event-no-coordinates