InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'WebApplication1.Models.Socios'

Question

I have a program in aspnet.core with login and logout. When I log in as a partner on the login page I have the "Teachers" layout that should show me the list of existing teachers. This method is obtained in the layout as

<li class="nav-item">
<a class="nav-link text-white" asp-controller="Professores" asp-action="ListarProfessores">Professores</a>

</li>

This method is created in the Teachers driver, I add a list view with the teachers in the class. In the Teachers answer list, I have this code:

       @model IEnumerable<WebApplication1.Models.Professores>

@{
    ViewData["Title"] = "ListarProfessores";
}

    <style>
        body {
            padding-top: 0px;
            background-color: gray;
            background-image: url();
            background-image: url();
            background-repeat: no-repeat;
        }
    </style>

<h1>Professores Registados</h1>


<table class="table" style="color:white">
    <thead>
        <tr>
            <th>
                @Html.DisplayNameFor(model => model.Nome)
            </th>
            <th>
                @Html.DisplayNameFor(model => model.Email)
            </th>



            <th></th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.Nome)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Email)
                </td>

                <td>

                    <a asp-controller="Socios" asp-action="EscolherPT" asp-route-id="@item.Idprofessor">Escolher PT</a>

                </td>
            </tr>
        }
    </tbody>
</table>

Can someone help me solve this please?

InvalidOperationException: The model item passed into the ViewDataDictionary is of type 'WebApplication1.Models.Socios', but this ViewDataDictionary instance requires a model item of type 'System.Collections.Generic.IEnumerable`1[WebApplication1.Models.Professores]'

In the Teachers controller I have this method:

 public IActionResult ListarProfessores()
    {
        int x = Convert.ToInt32(HttpContext.Session.GetInt32("UserId"));


        foreach (var item in _context.Socios)
        {
            if (item.Idsocio == x)
            {
                var y = item;
                return View(y);

            }
        }
        return View();
    }

So I have two classes: the teachers class and the social class. When I am logged in as a partner I wanted to see a list of the teachers in the table and select one to be a personal trainer. In the social class I have:

 public partial class Socios
    {
        public Socios()
        {
            Gerir = new HashSet<Gerir>();
            Mensagem = new HashSet<Mensagem>();
            Participa = new HashSet<Participa>();
            PersonalTrainer = new HashSet<PersonalTrainer>();
            Peso = new HashSet<Peso>();
            PlanosExercicios = new HashSet<PlanosExercicios>();
        }

        [Key]
        [Column("IDSocio")]
        public int Idsocio { get; set; }
        [Required]
        [Column("email")]
        [StringLength(100)]
        public string Email { get; set; }
        [Required]
        [Column("telefone")]
        [StringLength(20)]
        public string Telefone { get; set; }
        [Required]
        [Column("fotografia")]
        [StringLength(40)]
        public string Fotografia { get; set; }
        [Column("sexo")]
        public bool Sexo { get; set; } // true- Feminino
                                      //  false" - Masculino
        [Column("altura")]
        public double Altura { get; set; }
        [Required]
        [Column("nome_utilizador")]
        [StringLength(50)]
        public string NomeUtilizador { get; set; }
        [Column("peso_inicial")]
        public double PesoInicial { get; set; }
        [Required]
        [Column("_password")]
        [StringLength(20)]
        public string Password { get; set; }
        [Column("estado")]
        public int Estado { get; set; } // 1 ativo, 0 suspenso 

        //[Column("mensalidade")]
        //public bool Mensalidade { get; set; } //0-nao pago  1-pago

        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<Gerir> Gerir { get; set; }
        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<Mensagem> Mensagem { get; set; }
        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<Participa> Participa { get; set; }
        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<PersonalTrainer> PersonalTrainer { get; set; }
        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<Peso> Peso { get; set; }
        [InverseProperty("IdsocioNavigation")]
        public virtual ICollection<PlanosExercicios> PlanosExercicios { get; set; }
    }
}

In the teachers class I have:

public partial class Professores
    {
        public Professores()
        {
            MapaAulasGrupo = new HashSet<MapaAulasGrupo>();
            Mensagem = new HashSet<Mensagem>();
            PersonalTrainer = new HashSet<PersonalTrainer>();
            Peso = new HashSet<Peso>();
            PlanosExercicios = new HashSet<PlanosExercicios>();
        }

        [Key]
        [Column("IDProfessor")]
        public int Idprofessor { get; set; }
        [Required]
        [Column("nome")]
        [StringLength(50)]
        public string Nome { get; set; }
        [Required]
        [Column("email")]
        [StringLength(100)]
        public string Email { get; set; }
        [Column("telefone")]
        public int Telefone { get; set; }
        [Required]
        [Column("fotografia")]

        public string Fotografia { get; set; }
        [Column("sexo")]
        public bool Sexo { get; set; }
        [Required]
        [Column("especialidade")]
        [StringLength(50)]
        public string Especialidade { get; set; }
        [Column("estado")]
        public int Estado { get; set; }
        [Required]
        [Column("_password")]
        [StringLength(20)]
        public string Password { get; set; }

        [InverseProperty("IdprofessorNavigation")]
        public virtual ICollection<MapaAulasGrupo> MapaAulasGrupo { get; set; }
        [InverseProperty("IdprofessorNavigation")]
        public virtual ICollection<Mensagem> Mensagem { get; set; }
        [InverseProperty("IdprofessorNavigation")]
        public virtual ICollection<PersonalTrainer> PersonalTrainer { get; set; }
        [InverseProperty("IdprofessorNavigation")]
        public virtual ICollection<Peso> Peso { get; set; }
        [InverseProperty("IdprofessorNavigation")]
        public virtual ICollection<PlanosExercicios> PlanosExercicios { get; set; }
    }
}

In the Personal Trainer class I have: Personal trainers are chosen by members through existing teachers

 [Table("Personal_trainer")]
    public partial class PersonalTrainer
    {
        [Key]
        [Column("IDProfessor")]
        public int Idprofessor { get; set; }
        [Key]
        [Column("IDSocio")]
        public int Idsocio { get; set; }
        [Key]
        [Column("Data_Pedido", TypeName = "date")]
        public DateTime DataPedido { get; set; }
        [Column("data_Inicio", TypeName = "date")]
        public DateTime? DataInicio { get; set; }
        [Column("data_fim", TypeName = "date")]
        public DateTime? DataFim { get; set; }

        [ForeignKey(nameof(Idprofessor))]
        [InverseProperty(nameof(Professores.PersonalTrainer))]
        public virtual Professores IdprofessorNavigation { get; set; }
        [ForeignKey(nameof(Idsocio))]
        [InverseProperty(nameof(Socios.PersonalTrainer))]
        public virtual Socios IdsocioNavigation { get; set; }
    }
}

Answer 1

The error occurs since that your controller code return View(y) returns a Socio model while your view receives IEnumerable<WebApplication1.Models.Professores> as model.They are expected to be the same type.

I have separate classes, I have a socio class and a teacher class.

Then we need to know the relationships between Socio and Professores (you'd better show all necessary models code and their relationships) and return list of Professores.

For example, if Socio has

public class Socio
{
   //other properties
   public List<Professores> Professores {get;set;}
}

Then use return View(y.Professores);