How to take all but the last element in a sequence using LINQ?

Question

Let\'s say I have a sequence.

IEnumerable sequence = GetSequenceFromExpensiveSource();
// sequence now contains: 0,1,2,3,...,999999,1000000
         


        

Answer 1

A simple way would be to just convert to a queue and dequeue until only the number of items you want to skip is left.

public static IEnumerable SkipLast(this IEnumerable source, int n)
{
    var queue = new Queue(source);

    while (queue.Count() > n)
    {
        yield return queue.Dequeue();
    }
}