Shows if you're at the start, middle, or end of a foreach loop in C#

LoopPosition.cs

// This code assumes that it's run as a LinqPad script, but it's just the Main() part that assumes that.

void Main()
{
	 LoopStatus(new int[]{ 1, 2, 3, 4, 5 }).Dump();
}

// Define other methods and classes here

public enum Iteration { 
	First,
	Middle,
	Last,
}
public struct IterationPostition<T> { 
	public Iteration Iteration {get; private set;}
	public T Value {get; private set;}
	public IterationPostition(Iteration iter, T value)
	{
		Value = value;
		Iteration = iter;
	}
}

public IEnumerable<IterationPostition<T>> LoopStatus<T>(IEnumerable<T> innerIterator) {
	var enumerator =  innerIterator.GetEnumerator();

	bool hasMoreItems = false;
	T prev = default(T);
	Iteration state = Iteration.First;
	while (true)
	{
		switch (state) {
		
			case Iteration.First:
			hasMoreItems = enumerator.MoveNext();
			yield return new IterationPostition<T>(Iteration.First, enumerator.Current);
			hasMoreItems = enumerator.MoveNext();
			prev = enumerator.Current;
			state = Iteration.Middle;
			break;
			
			case Iteration.Middle:
			hasMoreItems = enumerator.MoveNext();
			if (hasMoreItems) {
				yield return new IterationPostition<T>(Iteration.Middle, prev);
				prev = enumerator.Current;
			} else {
				yield return new IterationPostition<T>(Iteration.Last, prev);
				state = Iteration.Last;
			}
			break;
			
			case Iteration.Last:
			yield break;
			
		}
	}
}