Why is there no Linq method to return distinct values by a predicate?

Question

I want to get the distinct values in a list, but not by the standard equality comparison.

What I want to do is something like this:

return myList.Dis         


        

Answer 1

But that seems messy.

It's not messy, it's correct.

• If you want Distinct Programmers by FirstName and there are four Amy's, which one do you want?
• If you Group programmers By FirstName and take the First one, then it is clear what you want to do in the case of four Amy's.

I can only use it here because I have a single key.

You can do a multiple key "distinct" with the same pattern:

return myList
  .GroupBy( x => new { x.Url, x.Age } )
  .Select( g => g.First() );