ASP.NET Core Route attributes available in entire controller class

Question

Is there a way to make attributes specified in the route available in the whole class? For instance, consider this Controller:

[Route("api/store/{storeId}/[controller]")]
public class BookController
{
    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int storeId, int id)
    {
    }
}

And this request:

/api/store/4/book/1

Inside the GetBookById method, the storeId variable is correctly populated with 4 and the id variable with 1. However, instead of having to pass the storeId variable in every method of the BookController, is there a way to do something like this:

[Route("api/store/{storeId}/[controller]")]
public class BookController
{
    private int storeId;

    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int id)
    {
        //use value of storeId here
    }
}

Answer 1

If the controller inherits from Controller class then you can override OnActionExecuting method, if the controller inherits from ControllerBase you need to implement IActionFilter interface to make it work

[Route("api/store/{storeId}/[controller]")]
public class BookController : ControllerBase, IActionFilter
{
    private int storeId;

    [HttpGet("{id:int:min(1)}")]
    public async Task<IActionResult> GetBookById(int id)
    {
        // use value of storeId here
    }

    public void OnActionExecuted(ActionExecutedContext context)
    {
        //empty
    }

    public void OnActionExecuting(ActionExecutingContext context)
    {
        string value = context.RouteData.Values["storeId"].ToString();
        int.TryParse(value, out storeId);
    }
}