Hi,

Tested in v10.9.1 - v11.3.0.0 

When using an IUrlResolver interface abstraction, making a call to GetUrl(IContentReference) or GetUrl(IContent) results in a NullReferenceException.

Having inspected the stack trace and the EPiServer dll's in Reflector, these calls invoke the extension methods within UrlResolverExtensions, ultimately executing the explicit interface implementation on UrlResolver with a null value for the parameter urlResolverArguments:

IUrlResolver.GetUrl(ContentReference contentLink, string language, UrlResolverArguments urlResolverArguments)

Which in turn calls the overload:

GetUrl(ContentReference contentLink, string language, VirtualPathArguments virtualPathArguments)

However when IUrlResolver.GetUrl implementation constructs a VirtualPathArguments object, passing a null value to the constructor, results in a NullReferenceException.

Steps to replicate:

1. Within a class in an episerver project, get an instance of IUrlResolver from the IoC container (constructor injected or via DependencyResolver / ServiceLocator)
2. Make a call to GetUrl passing in a ContentReference or a IContent instance
3. NullReferenceException is thrown

Workaround:

1. Replace usage of IUrlResolver with abstract UrlResolver

Thanks,

Stephen