The template item inserted in the dictionary is of type 'System.Collections.Generic.List`

Question

I am developing a project where I have the Patient class inherited from the User class and I am using the Entity Framework to map the database tables by type (TPT), when I try to access the Patient Class View browser I have the following error:

The template item inserted in the dictionary is from type'System.Collections.Generic.List1[Projeto.Models.Usuario]', mas esse dicionário requer um item do tipo 'System.Collections.Generic.IEnumerable1[Project.Models.Patient]'.

User class:

public  class Usuario : RepositorioBase<Usuario>, IUsuario

{ 
    public int Id { get; set; }

    public int Matricula { get; set; }

    public string Nome { get; set; }

    public int Email { get; set; }

    public DateTime DataCadastro { get; set; }

    public bool Ativio { get; set; }

}

Patient Class:

 public class Paciente : Usuario
    {

        public string Apelido { get; set; }

        public int Idade { get; set; }
}

Context:

public class Context : DbContext
    {
        public PepContext()
            : base("Context")
        {


        }

        public DbSet<Usuario> Usuario { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {

            modelBuilder.Configurations.Add(new PacienteConfiguration());


        }
}

Patienteconfiguration:

public class PacienteConfiguration: EntityTypeConfiguration<Paciente>
    {
        public PacienteConfiguration()
        {
            ToTable("Pacientes");
        }
    }

Model of the Patient class View:

@model IEnumerable<Projeto.Models.Paciente>

Controller:

 public class PacienteController : Controller
    {
        readonly Paciente _paciente;

        public PacienteController(Paciente paciente)
        {
            _paciente = paciente;
        }

        // GET: Paciente
        public ActionResult Index()
        {
            var paciente = _paciente.GetAll();
            return  View(paciente);
        }

        // GET: Paciente/Details/5
        public ActionResult Details(int id)
        {
            var paciente = _paciente.GetById(id);
            return View();
        }

        // GET: Paciente/Create
        public ActionResult Create()
        {
            return View();
        }

        // POST: Paciente/Create
        [HttpPost]
        public ActionResult Create(Paciente paciente)
        {
            if (ModelState.IsValid)
            {
                _paciente.Add(paciente);

                return RedirectToAction("Index");
            }

            return View(paciente);
        }

        // GET: Paciente/Edit/5
        public ActionResult Edit(int id)
        {
            var paciente = _paciente.GetById(id);
            return View();
        }

        // POST: Paciente/Edit/5
        [HttpPost]
        public ActionResult Edit(Paciente paciente)
        {
            if (ModelState.IsValid)
            {
                _paciente.Update(paciente);

                return RedirectToAction("Index");
            }

            return View(paciente);
        }

        // GET: Paciente/Delete/5
        public ActionResult Delete(int id)
        {
            var paciente = _paciente.GetById(id);
            return View(paciente);
        }

        // POST: Paciente/Delete/5
        [HttpPost, ActionName("Delete")]
        public ActionResult Delete(int id, FormCollection collection)
        {
            var paciente = _paciente.GetById(id);
            _paciente.Remove(paciente);

            return RedirectToAction("Index");
        }
    }

Answer 1

The problem is because it is not possible to convert a List to the Ienumerable type implicitly. You should change your Patient.Getall method (converting the List to Ienumerable type return) or the model type (Ienumerable to List) in your view.

See below:

Change in the Getall method:

    var pacientes = pacienteDb.ListarPacientes()
    return pacientes.AsEnumerable();

Or change the view model to the List type:

    @model List<Projeto.Models.Paciente>