Can I select multiple objects in a Linq query

Question

Can I return more than one item in a select? For instance I have a List of Fixtures (think football (or soccer for the yanks) fixtures). Each fixture contains a home and away t

Answer 1

Taking a stab at this myself I came up with the same version as 'it depends'.

Using query comprehension syntax:

IEnumerable drew =
    from fixture in fixtures
    where fixture.Played && (fixture.HomeScore == fixture.AwayScore)
    from team in new[]{fixture.AwayTeam, fixture.HomeTeam}
    select team;

Using lambda with extension methods:

IEnumerable drew =
    fixtures.Where(f => f.Played && f.HomeScore == f.AwayScore)
    .SelectMany(f => new[]{f.HomeTeam, f.AwayTeam});

Edit: I don't know if a team could have possibly played and drawn more than once in your database, but if that's possible, then you might want to make use of the Distinct query operator:

IEnumerable drew =
    (from fixture in fixtures
     where fixture.Played && (fixture.HomeScore == fixture.AwayScore)
     from team in new[]{fixture.AwayTeam, fixture.HomeTeam}
     select team).Distinct();

or:

IEnumerable drew =
    fixtures.Where(f => f.Played && f.HomeScore == f.AwayScore)
    .SelectMany(f => new[]{f.HomeTeam, f.AwayTeam})
    .Distinct();