Conflict with different routes in MVC - asp.net-mvc

Question

I have a website that manages inventory for restaurants. These are the routes I have:
routes.MapRoute(
"Inventory",
"Inventory/{restaurantName}/{restaurantLocationId}/{code}",
new { controller = "Inventory", action = "Index" },
new[] { "MySite.Web.Controllers" }
);
routes.MapRoute( // this route doesn't work
"ListRestaurantInventory",
"Inventory/List/{restaurantLocationId}/{code}",
new { controller = "Inventory", action = "ListRestaurantInventoryItems" },
new[] { "MySite.Web.Controllers" }
);
routes.MapRoute(
"InventoryDetails",
"Inventory/{restaurantName}/{restaurantLocationId}/{code}/Details/{restaurantInventoryItemId}",
new { controller = "Inventory", action = "Details" },
new[] { "MySite.Web.Controllers" }
);
The problem is with the ListRestaurantInventory route, I get a 404 if I try to navigate to /Inventory/List/1/ABC. My other routes work just fine.
I really have no idea what the problem is with my route. Do I need to change the order of my routes, or of the parameters in the URL?

Answer 1

Routes should be listed in order from most specific to least specific.
Your Inventory route is overriding your ListRestaurantInventory because every route that you pass with 4 segments (such as /Inventory/List/1/ABC) beginning with an Inventory segment will match it. This essentially makes your ListRestaurantInventory route an unreachable execution path. Reversing the order of these 2 routes will fix this.
routes.MapRoute(
"ListRestaurantInventory",
"Inventory/List/{restaurantLocationId}/{code}",
new { controller = "Inventory", action = "ListRestaurantInventoryItems" },
new[] { "MySite.Web.Controllers" }
);
routes.MapRoute(
"Inventory",
"Inventory/{restaurantName}/{restaurantLocationId}/{code}",
new { controller = "Inventory", action = "Index" },
new[] { "MySite.Web.Controllers" }
);
routes.MapRoute(
"InventoryDetails",
"Inventory/{restaurantName}/{restaurantLocationId}/{code}/Details/{restaurantInventoryItemId}",
new { controller = "Inventory", action = "Details" },
new[] { "MySite.Web.Controllers" }
);