How can I fix this?

Question

I am getting this error message on the Error List, but when I look up the code, I get no error highlight (red squiggly line), so there's no tips on how to fix this. The error is "An object reference is required for the non-static field, method, or property 'Mapper.Map<List<User>, List<UserViewModel>>(List<User>)'".
I don't understand the code fully (I didn't write it, I'm just making somes changes), but for what I know, it uses MVC, but it uses AutoMapper instead of Entity Framework.
The code is the following:

using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Web.Security;
using App.Infra;
using App.Model;
using AutoMapper;
using Domain.Entities;
using Domain.IApp;
using Domain.ValueObject;
using System.Globalization;

namespace Web.Controllers
{
    public class LoginController : BaseController
    {
        // GET: Login

        private readonly IUserApp _userApp;
        private readonly IFunctionApp _functionApp;
        private readonly IChannelApp _channelApp;

        public LoginController(IUserApp userApp, IFunctionApp functionApp, IChannelApp channelApp)
        {
            _userApp = userApp;
            _functionApp = functionApp;
            _channelApp = channelApp;
        }

        public ActionResult LogOn()
        {

            return View();
        }

        [HttpPost]
        public ActionResult LogOn(LoginViewModel login)
        {

            var loginAd = ValidateLogin.ActiveDirectoryAuthenticate(login.User, login.Password);
            User userAd = null;

            if (loginAd != null)
            {
                userAd = _userApp.GetUserBySId(loginAd.AdUserId);

                if (userAd == null)
                {
                    var u = new UserViewModel()
                    {
                        AdUserId = loginAd.AdUserId,
                        Name = loginAd.Name,
                        Mail = loginAd.Mail,
                        DtInclude = DateTime.Now,
                        Perfil = loginAd.Perfil,
                        Login = login.User
                    };

                    var user = Mapper.Map<UserViewModel, User>(u);
                    _userApp.Add(user);


                    var function = Mapper.Map<FunctionViewModel, Function>(ValidateLogin.Permissions(user.Id, user.Perfil));

                    _functionApp.Add(function);

                }
                else
                {
                    var functionByUserId = _functionApp.GetByUserId(userAd.Id);


                    if (functionByUserId != null)
                    {
                        var perfil = ValidateLogin.ValidateGroup(login.User, "Bandeirantes");

                        //  var perfil = Perfil.APP_REC_ADMIN_PORTAL;

                        bool updatePerfil = false;
                        if (userAd.DtUpdate < Convert.ToDateTime("05/11/2016 10:29:27", new CultureInfo("pt-BR")))
                        {
                            updatePerfil = true;
                        }

                        if (perfil != userAd.Perfil || updatePerfil)
                        {

                            userAd.Perfil = (Perfil)perfil;

                            var functionValidate = _functionApp.GetByUserId(userAd.Id);

                            IList<int> list = new List<int>();
                            foreach (var item in functionValidate.Channels)
                            {
                                list.Add(item.Id);
                            }

                            foreach (var item in list)
                            {
                                _functionApp.RemoveRelation(functionValidate.Id, item);
                            }

                            var function = ValidateLogin.Permissions(userAd.Id, userAd.Perfil);


                            foreach (var item in function.Channels)
                            {
                                _functionApp.UpdateRelation(functionValidate.Id, item.Id);
                            }

                        }
                        else
                        {
                            if (userAd.Perfil == Perfil.APP_REC_ADMIN_PORTAL || userAd.Perfil == Perfil.APP_REC_PORTAL)
                            {
                                var functionValidate = _functionApp.GetByUserId(userAd.Id);
                                functionValidate.PublishYT = true;
                                functionValidate.PublishUOL = true;

                                _functionApp.Update(functionValidate);

                            }
                        }


                    }
                    else if (functionByUserId == null)
                    {

                        var function = ValidateLogin.Permissions(userAd.Id, userAd.Perfil);

                        var domain = new Function();
                        domain.PublishUOL = function.PublishUOL;
                        domain.PublishYT = function.PublishYT;
                        domain.DownloadVideo = function.DownloadVideo;
                        domain.UserId = userAd.Id;
                        domain.DtInclude = DateTime.Now;
                        _functionApp.Add(domain);

                        foreach (var item in function.Channels)
                        {
                            _functionApp.UpdateRelation(domain.Id, item.Id);
                        }

                    }

                    userAd.DtUpdate = DateTime.Now;
                    _userApp.Update(userAd);
                }


                FormsAuthentication.SetAuthCookie(loginAd.Name + "|" + loginAd.AdUserId + "|" + userAd.Perfil + "|" + loginAd.Mail.Adress, true);

                return RedirectToAction("Index", "Home");
            }

            Danger("Usuário ou senha incorreto!");
            return View();
        }

        public ActionResult LogOff()
        {
            FormsAuthentication.SignOut();
            return View("LogOn");
        }


    }
}

Answer 1

Hi @Davi Leao Gomes

First, let's start with the reported error: "An object reference is required for the non-static field, method, or property"

The problem is that your method is not static, but you use it without instantiation.

I looked at Mapper's Map method and it doesn't seem to be static.

Actually, this has to do with the version of AutoMapper you're using. Starting with 11.0, it does not support the .NET Framework. As of 9.0, it has no static API support.

You can learn more from:

Configuration

9.0 Upgrade Guide

11.0 Upgrade Guide

Best Regards

Qi You

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Answer 2

How can I fix it ?