C#迭代器中的递归

public class RecursiveEnumerator<T>
{
    private readonly Func<T, T> _next;
    private readonly Func<T, bool> _hasNext;
    private T _current;

    public RecursiveEnumerator(T start, Func<T, T> next, Func<T, bool> hasNext)
    {
        _current = start;
        _next = next;
        _hasNext = hasNext;
    }

    public bool MoveNext()
    {
        if (!_hasNext(_current))
        {
            return false;
        }

        _current = _next(_current);
        return true;
    }

    public T Current => _current;
}

var enumerator = new RecursiveEnumerator<int>(0, x => x + 1, x => x < 10);

while (enumerator.MoveNext())
{
    Console.WriteLine(enumerator.Current);
}