记录创建MVC上的验证错误

Question

我已经广泛地比较了我的代码，但无法弄清楚出了什么问题。

状况

我有一张带有两个外键的学生（Alumnos）桌子，GROUP（Grupo）和TEACHER（Empleado）

我有一张带有三个外键的TEACHER（Empleado）表，SCHOOL（Escuela），GROUP（Grupo）和ROLE（Puesto）

问题

尝试使用除GROUP和TEACHER（从下拉列表）以外的所有内容创建STUDENTS记录时，我收到以下错误： 具有键'EmpleadoID'的ViewData项的类型为'System.Int32'，但必须是'IEnumerable'类型。

然而，当我使用TEACHER记录尝试同样的事情时，一切正常，我在下拉列表旁边得到相应的验证消息，应该是这样。

这两种情况的代码显然不完全相同，但结构基本相同。

以下两组代码：

FROM STUDENTS

CONTROLLER

   public ActionResult Create()
    {

        var AluGru = from g in db.Grupoes
                     where g.ID != 1
                     select g;

        var AluEmp = from e in db.Empleadoes
                     where e.PuestoID != 1
                     select e;

        ViewBag.GrupoID = new SelectList(AluGru, "ID", "Grupo1");
        ViewBag.EmpleadoID = new SelectList(AluEmp, "ID", "FullName");

        return View();
    }

    // POST: Alumnoes/Create
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "ID,Nombre,Apellido,Telefono,Estado,GrupoID,EmpleadoID")] Alumno alumno)
    {
        if (ModelState.IsValid)
        {
            db.Alumnoes.Add(alumno);
            db.SaveChanges();
            return RedirectToAction("../");
        }

        ViewBag.GrupoID = new SelectList(db.Grupoes, "ID", "Grupo1", alumno.GrupoID);
        ViewBag.EmlpeadoID = new SelectList(db.Empleadoes, "ID", "Nombre", alumno.EmpleadoID);

        return View(alumno);
    }

MODEL

public partial class Alumno
{
    public int ID { get; set; }
    [Required(AllowEmptyStrings = false, ErrorMessage = "Nombre es requerido")]
    public string Nombre { get; set; }
    [Required(AllowEmptyStrings = false, ErrorMessage = "Apellido es requerido")]
    public string Apellido { get; set; }
    [Required(AllowEmptyStrings = false, ErrorMessage = "Telefono es requerido")]
    public string Telefono { get; set; }
    [Required]
    public string Estado { get; set; }
    [Required]
    public int GrupoID { get; set; }
    [Required]
    public int EmpleadoID { get; set; }


    public virtual Grupo Grupo { get; set; }
    public virtual Empleado Empleado { get; set; }
}

查看

@model _3E_III.Models.Alumno

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>


@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
    <h4>Alumno</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => model.Nombre, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Nombre, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Nombre, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Apellido, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Apellido, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Apellido, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.Telefono, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Telefono, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Telefono, "", new { @class = "text-danger" })
        </div>
    </div>

    <div id="hidestate" class="form-group">
        @Html.LabelFor(model => model.Estado, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Estado, new { htmlAttributes = new { @class = "form-control", @Value = "Inactivo" } })
            @Html.ValidationMessageFor(model => model.Estado, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.GrupoID, "Grupo", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("GrupoID", null, "Selecciona un grupo", htmlAttributes: new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.GrupoID, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.EmpleadoID, "Maestro", htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.DropDownList("EmpleadoID", null, "Selecciona un maestro", htmlAttributes: new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.EmpleadoID, "", new { @class = "text-danger" })
        </div>
    </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "../")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

来自教师<​​/ p>

CONTROLLER

    public ActionResult Create()
    {

        var GID = (from g in db.Grupoes
                   where g.ID != 1
                   select g);

        var PID = (from p in db.Puestoes
                   where p.ID != 1
                   select p);

        ViewBag.EscuelaID = new SelectList(db.Escuelas, "ID", "Nombre");
        ViewBag.GrupoID = new SelectList(GID, "ID", "Grupo1");
        ViewBag.PuestoID = new SelectList(PID, "ID", "Puesto1");
        return View();
    }

    // POST: Empleadoes/Create
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create([Bind(Include = "ID,Nombre,Apellido,EscuelaID,PuestoID,GrupoID")] Empleado empleado)
    {
        if (ModelState.IsValid)
        {
            db.Empleadoes.Add(empleado);
            db.SaveChanges();
            return RedirectToAction("../");
        }

        ViewBag.EscuelaID = new SelectList(db.Escuelas, "ID", "Nombre", empleado.EscuelaID);
        ViewBag.GrupoID = new SelectList(db.Grupoes, "ID", "Grupo1", empleado.GrupoID);
        ViewBag.PuestoID = new SelectList(db.Puestoes, "ID", "Puesto1", empleado.PuestoID);
        return View(empleado);
    }

MODEL

public partial class Empleado
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public Empleado()
    {
        this.Alumnoes = new HashSet<Alumno>();
    }

    public int ID { get; set; }
    [Required(AllowEmptyStrings = false, ErrorMessage = "Nombre es requerido")]
    public string Nombre { get; set; }
    [Required(AllowEmptyStrings = false, ErrorMessage = "Nombre es requerido")]
    public string Apellido { get; set; }

    public string FullName { get { return Nombre + " " + Apellido; } }

    public int EscuelaID { get; set; }
    public int PuestoID { get; set; }
    public int GrupoID { get; set; }

    public virtual Escuela Escuela { get; set; }
    public virtual Grupo Grupo { get; set; }
    public virtual Puesto Puesto { get; set; }
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<Alumno> Alumnoes { get; set; }
}

查看

@model _3E_III.Models.Empleado

@{
    ViewBag.Title = "Create";
}

<h2>Create</h2>


@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Empleado</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Nombre, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Nombre, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Nombre, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Apellido, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Apellido, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Apellido, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.EscuelaID, "Escuela", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("EscuelaID", null, "Selecciona una escuela", htmlAttributes: new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.EscuelaID, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.PuestoID, "Puesto", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("PuestoID", null, "Selecciona un puesto", htmlAttributes: new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.PuestoID, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.GrupoID, "Grupo", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("GrupoID", null, "Selecciona un grupo", htmlAttributes: new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.GrupoID, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "../")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

据我所知，两者都应该可以正常工作，有什么我想念的吗？