C# 中的成对迭代，或滑动窗口枚举器

C#中的成对迭代，或滑动窗口枚举器

csharp
public class SlidingWindowEnumerator : IEnumerator<(T, T)>, IEnumerable<(T, T)>
{
    private readonly IEnumerator enumerator;
    private bool hasCurrent;
    private T current;
    public SlidingWindowEnumerator(IEnumerable source)
    {
        enumerator = source.GetEnumerator();
        hasCurrent = false;
        current = default(T);
    }
    public (T, T) Current { get; private set; }
    object IEnumerator.Current => Current;
    public bool MoveNext()
    {
        if (!hasCurrent)
        {
            hasCurrent = enumerator.MoveNext();
            if (hasCurrent)
            {
                current = enumerator.Current;
            }
        }
        bool hasNext = enumerator.MoveNext();
        Current = (current, enumerator.Current);
        current = enumerator.Current;
        return hasNext;
    }
    public void Reset()
    {
        enumerator.Reset();
        hasCurrent = false;
        current = default(T);
    }
    public void Dispose()
    {
        enumerator.Dispose();
    }
    public IEnumerator<(T, T)> GetEnumerator()
    {
        return this;
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

csharp
var numbers = new List { 1, 2, 3, 4, 5, 6 };
var enumerator = new SlidingWindowEnumerator(numbers);
foreach (var (current, next) in enumerator)
{
    Console.WriteLine($"Current: {current}, Next: {next}");
}