public static bool Any <TSource>(this IEnumerable <TSource> source)
{
switch (source)
{
case TSource[] array:
return(array.Length != 0);
case IReadOnlyCollection <TSource> collection:
return(collection.Count != 0);
default:
return(AnyDowncasted <IEnumerable <TSource>, TSource> .Any(source));
}
}
public static bool Any <TSource>(this IEnumerable <TSource> source, Func <TSource, bool> predicate) => AnyDowncasted <IEnumerable <TSource>, TSource> .Any(source, predicate);