I have a list of monthly values which I want to get a rolling yearly list over every iteration. In python, I can easily do this using something like

tempList = origList[x-12:x] 

Where x is the iterator. How can this be achieved using c#?

>Solution :

You can achieve that using the List<T>.GetRange method.

List<int> tempList = origList.GetRange(x - 12, 12);

The first argument is the index of the first element to include in the range. The second argument is the number of elements to include in the range.

Edit:
As pointed from the comment section. You can also use the range operator.

int[] tempArray = origArray[(x-12)..^x];