public static TSource[] ToArray <TSource>(this IEnumerable <TSource> source)
{
if (source == null)
{
throw Error.ArgumentNull("source");
}
IIListProvider <TSource> arrayProvider = source as IIListProvider <TSource>;
return(arrayProvider != null?arrayProvider.ToArray() : EnumerableHelpers.ToArray(source));
}
/// <summary>
/// Fully enumerates the provided enumerable and stores its items into an array.
/// </summary>
/// <param name="source">The enumerable to be store.</param>
internal Buffer(IEnumerable <TElement> source)
{
IIListProvider <TElement> iterator = source as IIListProvider <TElement>;
if (iterator != null)
{
TElement[] array = iterator.ToArray();
_items = array;
_count = array.Length;
}
else
{
_items = EnumerableHelpers.ToArray(source, out _count);
}
}
public IGrouping <TKey, TElement>[] ToArray()
{
IIListProvider <IGrouping <TKey, TElement> > lookup = Lookup <TKey, TElement> .Create(_source, _keySelector, _elementSelector, _comparer);
return(lookup.ToArray());
}