Zip N IEnumerables together? Iterate over them simultaneously?

Question

I have:-

IEnumerable> items;

and I\'d like to create:-

IEnumerable> r         


        

Answer 1

Now lightly tested and with working disposal.

public static class Extensions
{
  public static IEnumerable> JaggedPivot(
    this IEnumerable> source)
  {
    List> originalEnumerators = source
      .Select(x => x.GetEnumerator())
      .ToList();

    try
    {
      List> enumerators = originalEnumerators
        .Where(x => x.MoveNext()).ToList();

      while (enumerators.Any())
      {
        List result = enumerators.Select(x => x.Current).ToList();
        yield return result;
        enumerators = enumerators.Where(x => x.MoveNext()).ToList();
      }
    }
    finally
    {
      originalEnumerators.ForEach(x => x.Dispose());
    }
  } 
}

public class TestExtensions
{
  public void Test1()
  {
    IEnumerable> myInts = new List>()
    {
      Enumerable.Range(1, 20).ToList(),
      Enumerable.Range(21, 5).ToList(),
      Enumerable.Range(26, 15).ToList()
    };

    foreach(IEnumerable x in myInts.JaggedPivot().Take(10))
    {
      foreach(int i in x)
      {
        Console.Write("{0} ", i);
      }
      Console.WriteLine();
    }
  }
}