我可以有一个方法返回IEnumerator <T>并在foreach循环中使用它吗？

using System;
using System.Collections;
using System.Collections.Generic;

public class CustomEnumerator<T> : IEnumerator<T>
{
    private readonly List<T> _items;
    private int _currentIndex;

    public CustomEnumerator(List<T> items)
    {
        _items = items;
        _currentIndex = -1;
    }

    public bool MoveNext()
    {
        _currentIndex++;
        return _currentIndex < _items.Count;
    }

    public void Reset()
    {
        _currentIndex = -1;
    }

    public T Current
    {
        get
        {
            if (_currentIndex < 0 || _currentIndex >= _items.Count)
            {
                throw new InvalidOperationException("Enumerator is in an invalid state.");
            }

            return _items[_currentIndex];
        }
    }

    object IEnumerator.Current
    {
        get
        {
            return Current;
        }
    }

    public void Dispose()
    {
        // Clean up any resources if necessary.
    }
}

public class Program
{
    public static void Main()
    {
        var items = new List<int> { 1, 2, 3, 4, 5 };
        var enumerator = new CustomEnumerator<int>(items);

        foreach (var item in enumerator)
        {
            Console.WriteLine(item);
        }
    }
}