Why does C# compiler create private DisplayClass when using LINQ method Any() and how can I avoid it?

Question

I have this code (the whole code is not important but can be seen on this link):

internal static class PlayCardActionValidator
{
    public static bool CanPl         


        

Answer 1

How can I avoid creating this class (his instances and their garbage collecting) when using the Any method?

Why does the C# compiler creates this class and is there any alternative of Any() I can use?

Other posters already explained the why part, so the better question would be How can I avoid creation of a closure?. And the answer is simple: if lambda is using only the passed parameters and/or constants, the compiler will not create a closure. For instance:

bool AnyClub() { return playerCards.Any(c => c.Suit == CardSuit.Club); }

bool AnyOf(CardSuit suit) { return playerCards.Any(c => c.Suit == suit); }

The first will not create a closure while the second will.

With all that in mind, and assuming you don't want to use for/foreach loops, you can create own extension methods similar to those in System.Linq.Enumerable but with additional parameters. For this particular case, something like this would work:

public static class Extensions
{
    public static bool Any(this IEnumerable source, TArg arg, Func predicate)
    {
        foreach (var item in source)
            if (predicate(item, arg)) return true;
        return false;
    }
} 

and change the code in question to:

var hasBigger =
    playerCards.Any(otherPlayerCard, 
        (c, opc) => c.Suit == opc.Suit
             && c.GetValue() > opc.GetValue());