Question

The code below is part of authorization. I am trying to mentally imaging what it actually does but could not somehow.

IsAuthorized = ((x, y) => x.Any(z => y.Contains(z)));

Could anyone explain this lambda expression to me?

Thanks!

Edit:

IsAuthorized is a delegate type. The previous programmer who code this seems want to keep it secret by putting delegate to the end of cs file.

The actual code is:

public delegate bool IsAuthorized(IEnumerable<Int32> required, IEnumerable<Int32> has);
IsAuthorized = ((x, y) => x.Any(z => y.Contains(z)));

Answer 1

Sure – it’s saying given a pair (x, y), does x contain any values such that y contains that value.

Looks to me like it’s really saying “is there any intersection between x and y“.

So an alternative would probably be:

IsAuthorized = (x, y) => x.Intersect(y).Any();

It’s just possible that that wouldn’t work, depending on the type of IsAuthorized, but I expect it to be correct.