asp.net mvc路由可选参数不能匹配

Question

写了一个Attribute路由Route("Home/{category?}/{subcategory?}/List")想匹配以下规则/Home/C1/S1/List , /Home/C1/List , /Home/List好像只能匹配到第一种情况，可选参数没起作用。 如若匹配以上怎么用一个路由规则搞定？public class HomeController : Controller{    public IActionResult Index()    {        return View();    }    [Route("Home/{category?}/{subcategory?}/List")]    public IActionResult List(Category? category = null, SubCategory? subcategory = null)    {        return Content(category.ToString() + "/" + subcategory.ToString());    }    [Route("Home/{code}/Detail")]    public IActionResult Detail(string code)    {        return Content(code);    }}public enum Category{    C1,    C2,    C3,    C4}public enum SubCategory{    S1,    S2,    S3,    S4}在stackoverflow的提问：asp.net mvc routing with multiple optional parameters did not work

Answer 1

一个路由应该是做不到，使用三个可以

[Route("Home/List")]
[Route("Home/{category?}/List")]
[Route("Home/{category?}/{subcategory?}/List")]