mvc attribute routing with optional parameter

Question

I got the following attribute set

    [Route("{country}/{state}/{city}/listing/{name?}/{address}/{id}", Name = "ViewListing")]
    public ActionResult Index()
    {
    ...
    }

following url works fine

http://localhost:16949/ca/on/london/listing/something/1830-avalon-street/d46fc94f-9a90-460a-b18f-7443db3c1897

however the following gives 404, even though the name parameter is set as optional

http://localhost:16949/ca/on/london/listing/1830-avalon-street/d46fc94f-9a90-460a-b18f-7443db3c1897

I also have other routes defined that have the same number of parameters with different structure and those do not fire either(and they should not), for clarity, here are the other routes

CITY
{country}/{state}/{city}
{country}/{state}/{city}/{type}
{country}/{state}/{city}/bedrooms/{parameters}
{country}/{state}/{city}/{type}/bedrooms/{parameters}
{country}/{state}/{city}/area/{area}
{country}/{state}/{city}/area/{area}/bedrooms/{parameters}

Answer 1

The option route parameter should be at last. In you case, when you no pass the {name}, The route will not match "{country}/{state}/{city}/listing/{address}/{id}". And then not route match the second url, so it will give you 404