LINQ “zip” in String Array

Question

Say there are two arrays:

String[] title = { \"One\",\"Two\",\"three\",\"Four\"};
String[] user = { \"rob\",\"\",\"john\",\"\"};

I need to

Answer 1

It sounds like you actually want to "zip" the data together (not join) - i.e. match pairwise; is that correct? If so, simply:

    var qry = from row in title.Zip(user, (t, u) => new { Title = t, User = u })
              where !string.IsNullOrEmpty(row.User)
              select row.Title + ":" + row.User;
    foreach (string s in qry) Console.WriteLine(s);

using the Zip operation from here:

// http://blogs.msdn.com/ericlippert/archive/2009/05/07/zip-me-up.aspx
public static IEnumerable Zip
(this IEnumerable first,
IEnumerable second,
Func resultSelector)
{
    if (first == null) throw new ArgumentNullException("first");
    if (second == null) throw new ArgumentNullException("second");
    if (resultSelector == null) throw new ArgumentNullException("resultSelector");
    return ZipIterator(first, second, resultSelector);
}

private static IEnumerable ZipIterator
    (IEnumerable first,
    IEnumerable second,
    Func resultSelector)
{
    using (IEnumerator e1 = first.GetEnumerator())
    using (IEnumerator e2 = second.GetEnumerator())
        while (e1.MoveNext() && e2.MoveNext())
            yield return resultSelector(e1.Current, e2.Current);
}