Untitled

Use Linq to construct distinct, ordered of objects based on properties
class Foo()
{
    public Bar [] bars;
}

class Bar ()
{
    public string name;
    public int id;
}

foo[0] => bars { { name = "one", id = 1 }, { name = "two", id = 2 }, { name = "three", id = 3 },
foo[1] => bars { { name = "four", id = 4 }, { name = "four", id = 4 }

{ name = "one", id = 1 }, { name = "two", id = 2 }, { name = "three", id = 3 }, { name = "four", id = 4 }

var values = foo.SelectMany(f => f.bars)
                .Distinct()
                .OrderBy(b => b.id);

var values = foo.SelectMany(f => f.bars)
                .DistinctBy(b => b.id)
                .OrderBy(b => b.id);

var values = foo.SelectMany(f => f.bars)
                .DistinctBy(b => new { b.id, b.name })
                .OrderBy(b => b.id);

Foos.SelectMany(foo => foo.bars).OrderBy(bar => bar.id).Distinct()