Extension methods overload choice

Question

I have two extension methods:

public static IPropertyAssertions<T> ShouldHave<T>(this T subject)
{
    return new PropertyAssertions<T>(subject);
}

public static IPropertyAssertions<T> ShouldHave<T>(this IEnumerable<T> subject)
{
    return new CollectionPropertyAssertions<T>(subject);
}

Now I write some code which uses it:

List<Customer> collection2 = new List<Customer>(); 
collection2.ShouldHave(); //first overload is chosen
IEnumerable<Customer> collection3 = new List<Customer>(); 
collection3.ShouldHave(); //second overload is chosen

Second overload is chosen only if I explicitly specify IEnumerable type. Is there any way to make second overload to be chosen in both cases?

Answer 1

The first overload is a better match, because T is inferred as List<Customer>, which gives an exact match. For the second overload, it would infer T as Customer, so the parameter would be IEnumerable<Customer>, which is a less exact match than List<Customer>.

Answer 2

Don't think so. Don't think it's possible that in this case IEnumerable<T> overload will be always called, as it has less accurate match in regard of T type. If you don't specify a concrete IEnumerable<T>, the best match will be always a first method, in this case.