Creates a list by combining two other lists into one.
using System.Linq;
using System.Diagnostics;
namespace System.Collections.Generic
{
public static class EnumeratorExtensions
{
/// <summary>
/// Creates a list by combining two other lists into one.
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <typeparam name="T2"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source1">One of the lists to zip.</param>
/// <param name="source2">One of the lists to zip.</param>
/// <param name="zipFunction">The delegate used to combine items.</param>
/// <returns>A new list with the combined items.</returns>
public static IEnumerable<TResult> Zip<T1, T2, TResult>(this IEnumerable<T1> source1, IEnumerable<T2> source2, Func<T1, T2, TResult> combine)
{
if (source1 == null)
throw new ArgumentNullException("source1");
if (source2 == null)
throw new ArgumentNullException("source2");
if (combine == null)
throw new ArgumentNullException("combine");
return ZipIterator<T1, T2, TResult>(source1, source2, combine);
}
private static IEnumerable<TResult> ZipIterator<T1, T2, TResult>(IEnumerable<T1> source1, IEnumerable<T2> source2, Func<T1, T2, TResult> combine)
{
Debug.Assert(source1 != null, "source1 is null.");
Debug.Assert(source2 != null, "source2 is null.");
Debug.Assert(combine != null, "combine is null.");
using (IEnumerator<T1> data1 = source1.GetEnumerator())
using (IEnumerator<T2> data2 = source2.GetEnumerator())
while (data1.MoveNext() && data2.MoveNext())
{
yield return combine(data1.Current, data2.Current);
}
}
}
}