Tag: Except

Linq: Split()

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So you know the Cinderella saying “The good ones go into the pot, the bad ones go into your crop.”?

Well, .NET Linq does have a solution for either one, it’s called Where(). If you use that, your solution probably looks like this:

var evens = list.Where(number => ((number % 2) == 0));
var odds =  list.Where(number => ((number % 2) != 0));

But it does not have a solution for both. So I wrote myself one:

public static void Split<T>(this IEnumerable<T> source
    , Func<T, Boolean> predicate
    , out IEnumerable<T> trueList
    , out IEnumerable<T> falseList)
{
    trueList = source.Where(predicate);
    falseList = source.Except(trueList);
}

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