Deal with it or don't

Obvious Extension Methods: The Simple Join

Maybe you just want to know the things from list1 where they have a match in list2.

You can do that yesterday and today with list1.Join(list2, item1=>item1, item2=>item2, (item1,item2)=>item1);

But today and tomorrow, you can simply do list1.Join(list2).

Obvious, right?

  1. public static class Extensions
  2. {
  3.     public static IEnumerable<T> Join<T>(this IEnumerable<T> outer,
  4.         IEnumerable<T> inner)
  5.     {
  6.         return outer.Join(inner, a => a, b => b, (a, b) => a);
  7.     }
  8. }

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