ToLookup with multiple keys

Question

Is there a way to require multiple keys for the .ToLookup function provided by LINQ?

I will admit that this seems non-intuitive at first, and I\'m expecting

Answer 1

I would use Tuples for this sort of thing:

var lookup = set.ToLookup(x => Tuple.Create(x.StringProp, x.IntProp));
MyClass c = lookup[Tuple.Create("a", 1)].First();
IEnumerable list = lookup[Tuple.Create("c", 4)];