Is there a way to get a value from a route defined on the controller without adding the parameter to all http methods?

Example of what I'm trying to do.

calling localhost/api/test/client

[Route("api/{somevar}/[controller]")]
[ApiController]
public class ClientController : ControllerBase
{
    private readonly MainContext fContext;
    private string fSomeVar;

    public ClientController(MainContext pContext)
    {
        fContext = pContext;
        fSomeVar = somevar; <-- Is there a way to get "test" from the route?
    }

    // GET: api/Client
    [HttpGet]
    public async Task<ActionResult<IEnumerable<ClientDH>>> GetClients()
    {
        // use fSomeVar here.
    }

    // GET: api/Client
    [HttpGet]
    public async Task<ActionResult<IEnumerable<ClientDH>>> GetClients(string somevar)
    {
        // this works but I'm trying to avoid changing all the methods in all controllers.
    }
}

CodePudding user response：

My suggestion is below:

1.You can use IHttpContextAccessor to get the route value from the http request, code as below:

 public DemoController(IHttpContextAccessor httpContextAccessor)
        {      
            fSomeVar = httpContextAccessor.HttpContext.Request.RouteValues["somevar"].ToString();
        }

and in startup.cs, you need to configure:

services.AddHttpContextAccessor();

2.Demo:

    [Route("api/{somevar}/[controller]")]
    [ApiController]
    public class DemoController : ControllerBase
    {
        private string fSomeVar;
        public DemoController(IHttpContextAccessor httpContextAccessor)
        {      
            fSomeVar = httpContextAccessor.HttpContext.Request.RouteValues["somevar"].ToString();
        }
        [HttpGet]
        public async Task<IActionResult> Demo1()
        {    
            try
            {
                return Ok("Id: "   fSomeVar);
            }
            catch
            {
                return BadRequest();
            }
        }

        [HttpGet("demo2/{id1}/{id2}")]
        public async Task<IActionResult> Demo2(string id1, int id2)
        {
            try
            {
                return Ok("Id1: "   id1   ", Id2: "   id2  ", Id3: "   fSomeVar);
            }
            catch
            {
                return BadRequest();
            }
        }
}

Result: