public int FlyAway(ref UFOList ufoList, SoundEffectInstance flyAwaySong)
{
var flyingUfoesList = new UFOList();
foreach (var ufo in ufoList)
{
if ((((ufo.rectangle.X + ufo.rectangle.Width) < 0) || (ufo.rectangle.Y + ufo.rectangle.Height < 0)) && (ufo.state == UFOState.Fly))
{
if (flyingUfoesList.Contains(ufo) == false)
{
flyingUfoesList.Add(ufo);
flyAwaySong.Play();
}
}
}
int flyingufoes = flyingUfoesList.Count;
foreach (var fly in flyingUfoesList)
{
ufoList.Remove(fly);
}
return flyingufoes;
}
