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

If you can get the Count or Length of an enumerable, which in most cases you can, then just Take(n - 1)

Example with arrays

int[] arr = new int[] { 1, 2, 3, 4, 5 };
int[] sub = arr.Take(arr.Length - 1).ToArray();

Example with IEnumerable

IEnumerable enu = Enumerable.Range(1, 100);
IEnumerable sub = enu.Take(enu.Count() - 1);