Question

Here I have:

routes.MapRoute(
    "test", // Route name
    "DataWarehouse/Distribution/{category}/{serialNo}",
    new { controller = "DataWarehouse", 
          action = "Distribution", 
          category= UrlParameter.Optional, 
          serialNo = UrlParameter.Optional } 
);

Category and serialNo are both optional params. When the routing is like: DataWarehouse/Distribution/123, it always treat 123 as the value for category.

My question is how I can make it to know the 1st param could be either category or serialNo, i.e. DataWarehouse/Distribution/{category} and DataWarehouse/Distribution/{serialNo}.

Answer 1

DataWarehouse/Distribution/{category}/{serialNo}

Only the last parameter can be optional. In this example category cannot be optional for obvious reasons.