public static int FindIndex <TSource>(this IEnumerable <TSource> source, TSource element, IEqualityComparer <TSource> equalityComparer)
{
if (source is null)
{
throw new ArgumentNullException(nameof(source));
}
if (equalityComparer is null)
{
throw new ArgumentNullException(nameof(equalityComparer));
}
return(EnumerableEx.FindIndexInternal(
source,
t => equalityComparer.Equals(t, element)
));
}
public static int FindIndex <TSource, TTemporary, TElement>(this IEnumerable <TSource> source, Func <TSource, TTemporary> sourceSelector, TElement element, Func <TElement, TTemporary> elementSelector, IEqualityComparer <TTemporary> equalityComparer)
{
if (source is null)
{
throw new ArgumentNullException(nameof(source));
}
if (sourceSelector is null)
{
throw new ArgumentNullException(nameof(sourceSelector));
}
if (elementSelector is null)
{
throw new ArgumentNullException(nameof(elementSelector));
}
if (equalityComparer is null)
{
throw new ArgumentNullException(nameof(equalityComparer));
}
return(EnumerableEx.FindIndexInternal(
source,
t => equalityComparer.Equals(sourceSelector(t), elementSelector(element))
));
}