I was able to get the event SizeChangedto maximize:
private void window1_SizeChanged(object sender, SizeChangedEventArgs e)
{
var a = window1.ActualHeight;
var b = window1.ActualWidth;
var c = window1.Height;
var d = window1.Width;
}
And these are the values for windows Heightand Width:
a = 838.4
b = 1550.4
c = 350.4
d = 524.8