public static TSource[] ToArray <TSource>(this IEnumerable <TSource> source)
{
switch (source)
{
case TSource[] array:
return(array);
case IReadOnlyList <TSource> list:
return(ReadOnlyList.ToArray <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(list));
case IReadOnlyCollection <TSource> collection:
return(ReadOnlyCollection.ToArray <IReadOnlyCollection <TSource>, IEnumerator <TSource>, TSource>(collection));
default:
return(Enumerable.ToArray <IEnumerable <TSource>, IEnumerator <TSource>, TSource>(source));
}
}
public static TSource[] ToArray <TSource>(this List <TSource> source) => ReadOnlyList.ToArray <List <TSource>, List <TSource> .Enumerator, TSource>(source);
public static TSource[] ToArray <TSource>(this ImmutableList <TSource> source) => ReadOnlyList.ToArray <ImmutableList <TSource>, TSource>(source);
public static TSource[] ToArray <TSource>(this IReadOnlyList <TSource> source) => ReadOnlyList.ToArray <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(source);