// factory method example. this one could have been normal constructor
public static Match Create(DateTime date, Country team1Country, Country team2Country)
{
if (team1Country == null) throw new ArgumentNullException("team1Country");
if (team2Country == null) throw new ArgumentNullException("team2Country");
if (team1Country.Equals(team2Country)) throw new ArgumentException("Teams must not be the same country!");
var match = new Match { date = date };
match.teams.Add(new Team(match, team1Country));
match.teams.Add(new Team(match, team2Country));
return match;
}
internal Team(Match match, Country country)
{
this.match = match;
this.country = country;
}
internal Team(Match match, Country country)
{
Match = match;
Country = country;
}