.NET Core : Get parameter value in controller's constructor

Question

I have gone through this solution but this is not what I am looking for get parameters from URL in controller constructor.

Let's say, In an ASP.NET Core Controller I'm requesting to some methods. Let's say the controller is something like:

public class ClassroomsController : Controller {

    private string requestedUserId;

    // C O N S T R U C T O R
    public ClassroomsController()
    {
        /**** THIS POINT ***/
        requestedUserId = ;
    }

    [HttpGet("Classrooms/API01/{userId}")]
    public IActionResult API01(string userId)
    {

    }

    [HttpGet("Classrooms/API02/{userId}")]
    public IActionResult API02(string userId)
    {

    }
}

What I want is whether I request in Classrooms/API02 or Classrooms/API01 the requestedUserId should be initiated inside the constructor based on the parameter userId in both API01 and API02;

Answer 1

What I want is whether I request in Classrooms/API02 or Classrooms/API01 the requestedUserId should be initiated inside the constructor based on the parameter userId in both API01 and API02

Short Answer: Not Possible.

All request related logic needs to happen within the action itself.

public class ClassroomsController : Controller {

    // C O N S T R U C T O R
    public ClassroomsController() {
        //...
    }

    [HttpGet("Classrooms/API01/{userId}")]
    public IActionResult API01(string userId) {
        string requestedUserId = userId;

        //...
    }

    [HttpGet("Classrooms/API02/{userId}")]
    public IActionResult API02(string userId) {
        string requestedUserId = userId;

        //...
    }
}

If there is some common functionality that needs to be invoked, then move that to a method that can be called by the controller actions when invoked.