ASP.NET MVC 4从另一个控制器调用一个控制器方法

Question

I am stuck on this issue. I have two controllers, UsersController and HomeController I am trying to call a controller method from UsersController from another controller (HomeController) by doing this:

UsersController usersController = new UsersController();

but I get this error: Generate constructor stub in 'CTHRC.Roti.Web.UI.Controllers.UsersController'

I do not understand this error.

Here is my UsersController:

using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Web;
using System.Web.Http;
using CTHRC.Roti.Domain.Api.Services;
using CTHRC.Roti.Domain.Model;

namespace CTHRC.Roti.Web.UI.Controllers
{
    public class UsersController : ApiController
    {
         protected readonly UsersService UsersService;

        public UsersController(UsersService usersService)
        {
            UsersService = usersService;
        }

        [HttpGet]
        public dynamic Get(int UserId)
        {
            return UsersService.Get(UserId);
        }
    }
}

Here is my HomeController:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using WebMatrix.WebData;

namespace CTHRC.Roti.Web.UI.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Default/

        public ActionResult Index()
        {
            if (!WebSecurity.IsAuthenticated)
            {
                Response.Redirect("~/account/login");
            }
            UsersController userController = new UsersController();
            return View();

        }

    }
}

What do I have to do to fix this? Any help would be appreciated. Thanks. The reason I am trying to do this is because I want the data from the controller method.

Answer 1

Your UsersController does not have a parameterless constructor, which is expected by the call site.

You can add one like this:

public UsersController() {
}

Otherwise, you must provide a UsersService as a parameter at the call site.