LINQ expression to extract only two word phrases

I have a list (of objects), with one property in the object as a string.

This property always contains single words and would like to loop through all sequential combinations in pairs, for example:

word1

word2

word3

word4

word5

I am trying to write LINQ which will allow me to iterate through the data in the following format:

word1 [space] word2

word2 [space] word3

word3 [space] word4

word4 [space] word5

Could anybody suggest the most efficient way of doing this.

I have a bunch of conditional IF statements at the moment that I'm looking to remove.

---

I think you want:

var pairs = words.Zip(words.Skip(1), (x, y) => x + " " + y);

That's assuming you're using .NET 4, which is when Zip was introduced.

---

You could write your own extension method:

public static IEnumerable<Tuple<TOutput, TOutput>> Pairwise<TInput, TOutput>(this IEnumerable<TInput> collection, Func<TInput, TOutput> func)
{
  using (var enumerator = collection.GetEnumerator()) 
  {
    if (!enumerator.MoveNext()) yield break;
    TOutput first = func(enumerator.Current);
    while (enumerator.MoveNext())
    {
      TOutput second = func(enumerator.Current);
      yield return Tuple.Create(first, second);
      first = second;
    }
  }
}

Which would be useable like so:

IEnumerable<string> pairs = yourCollection.Pairwise(element => element.Property).Select(t => t.Item1 + ' ' + t.Item2);

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