private static Type? GetGenericInterfaceImplementationTypeArgument()

in src/Google.Cloud.Functions.Hosting/HostingInternals.cs [279:286]

• 6 lines of code
• 3 McCabe index (conditional complexity)

        private static Type? GetGenericInterfaceImplementationTypeArgument(Type target, Type genericInterface)
        {
            var matches = target.GetInterfaces()
                .Where(iface => iface.IsGenericType && iface.GetGenericTypeDefinition() == genericInterface);
            // We only want to return an unambiguous match. Note that this will evaluate the list twice in the "got one" case,
            // but that's okay.
            return matches.Count() == 1 ? matches.Single().GetGenericArguments()[0] : null;
        }