public static TSource SingleOrDefault <TSource>(this IReadOnlyList <TSource> source, Func <TSource, bool> predicate)
{
switch (source)
{
case TSource[] array:
return(ArrayExtensions.SingleOrDefault <TSource>(array, predicate));
default:
return(ReadOnlyList.SingleOrDefault <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(source, predicate));
}
}
public static TSource SingleOrDefault <TSource>(this IEnumerable <TSource> source, Func <TSource, bool> predicate)
{
switch (source)
{
case TSource[] array:
return(ArrayExtensions.SingleOrDefault <TSource>(array, predicate));
default:
return(SingleOrDefaultDowncasted <IEnumerable <TSource>, TSource> .SingleOrDefault(source));
}
}
