如何“压缩”或“旋转”可变数量的列表？

如何“压缩”或“旋转”可变数量的列表？

您可以滚动自己的ZipMany实例，该实例手动迭代每个枚举。与

GroupBy

投影每个序列后使用的序列相比，这可能会在较大的序列上表现更好：

public static IEnumerable<TResult> ZipMany<TSource, TResult>(    IEnumerable<IEnumerable<TSource>> source,    Func<IEnumerable<TSource>, TResult> selector){   // ToList is necessary to avoid deferred execution   var enumerators = source.Select(seq => seq.GetEnumerator()).ToList();   try   {     while (true)     {       foreach (var e in enumerators)       {bool b = e.MoveNext();if (!b) yield break;       }       // Again, ToList (or ToArray) is necessary to avoid deferred execution       yield return selector(enumerators.Select(e => e.Current).ToList());     }   }   finally   {       foreach (var e in enumerators)          e.Dispose();   }}