Monse Montoya's questions

I am trying to edit records of a catalog, this catalog has the option to upload an image but it is not a required field. The problem is that when editing the record, whether that record already has an image saved or not, it sends me an error if I don't select an image from the input, it's as if it were a required field.

The error is this...

Object reference not set to an instance of an object. Image was null.

I am supposed to call the image that is stored on the server but I don't know how to do it.

Here is what I have in the Controller Building...

public ActionResult Update(int id)
{
    if (Session["Usuario"] == null)
    {
        return RedirectToAction("Index", "Login");
    }
    else
    {
        ObtenerEdificio resp = obj.catEdificioObtener(id);
        return View(resp);
    }
}

[HttpPost]
    public ActionResult Update(ObtenerEdificio vm, HttpPostedFileBase Imagen)
    {
        byte[] fileBytes = new byte[Imagen.InputStream.Length];
        int byteCount = Imagen.InputStream.Read(fileBytes, 0, (int)Imagen.InputStream.Length);
        string fileContent = Convert.ToBase64String(fileBytes);

        ActualizaEdificio entrada = new ActualizaEdificio();
        entrada.IdEdificio = vm.IdEdificio;
        entrada.Descripcion = vm.Descripcion;
        entrada.Imagen = fileContent;

        RespuestaGeneral resp = obj.catEdificioActualiza(entrada);

        ViewBag.successMessage = resp.Mensaje;

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

Here is what I have in my View Update...

@using (Html.BeginForm("Update", "Edificios", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.HiddenFor(d => d.IdEdificio)
    <div class="box-body">
        <div class="form-group">
            <label for="inputDescripcion" class="form-control-label mt-3 ml-5">Nombre:</label>
            @Html.ValidationMessageFor(m => m.Descripcion, "", new { @class = "ml-2", style = "color:red" })
            @Html.TextBoxFor(m => m.Descripcion, "", new { @type = "text", @class = "form-control ml-5", style = "width:92%" })
        </div>
        <div class="form-group" style="text-align:center">
            <img class="mb-3" style="width:150px; height:150px;" onerror="this.src='/ImagenesSubidas/SinImagen.jpg';" src="@Url.Content(@Model.Imagen)" id="preview" />

            <div class="box-footer">
                <label for="file-upload" class="subir">
                    <i class="fas fa-cloud-upload-alt"></i> Subir archivo
                </label>
                <input type="file" accept="image/*" class="block" onchange='cambiar()' style='display:none;' id="file-upload" name="Imagen" />
                <div id="info"></div>
            </div>
        </div>
    </div>
    <div class="box-footer" style="text-align:center">
        <button type="submit" class="btn block btn-success mt-3 mb-3" style="width: 30%" name="crear">Guardar <i class="fa fa-plus-circle"></i></button>
    </div>
}

I hope you understand me and can help me with my problem. Thanks.

Good morning, I hope you can help me with the following problem.

I am doing the CRUD of several catalogs, my back is in wcf and my front is in asp.net mvc. I added the service reference in my asp.net project and I already have the methods done. In the Controller I have two Update methods, in one the ws method is called to display the data and in the other the ws method is expected to be called to update that data.

Here is the controller code...

    public ActionResult Update(int id)
    {
        if (Session["Usuario"] == null)
        {
            return RedirectToAction("Index", "Login");
        }
        else
        {
            ObtenerEdificio resp = obj.catEdificioObtener(id);

            // Mostrar Update
            return View(resp);
        }            
    }

    [HttpPost]
    public ActionResult Update(ActualizaEdificio vm)
    {
        ActualizaEdificio entrada = new ActualizaEdificio();
        entrada.Descripcion = vm.Descripcion;
        entrada.Imagen = vm.Imagen;

        RespuestaGeneral resp = obj.catEdificioActualiza(entrada);

        ViewBag.successMessage = resp.Mensaje;

        // Mostrar Index
        return RedirectToAction("Index", "Edificio");
    }

As you can see, each one calls a different method and model, so that's where the problem comes from. In my Update view I add the model ObtenerEdificioand if the data is displayed, but I cannot add the model ActualizaEdificioin the same view so the data cannot be edited.

Here is the code of my view...

@model AdministraZion.ServiceReference1.ObtenerEdificio

<div class="panel br-20x panel-default">
    <div class="panel-head">
        <div class="panel-title">
            <i class="icon-layers panel-head-icon text-primary"></i>
            <span class="panel-title-text">Editar Edificio</span>
        </div>
    </div>

    @using (Html.BeginForm("Update", "Edificio", FormMethod.Post))
    {
        @Html.HiddenFor(d => d.IdEdificio)
        <div class="box-body">
            <div class="form-group">
                <label for="inputDescripcion" class="form-control-label mt-3 ml-5">Nombre:</label>
                @Html.ValidationMessageFor(m => m.Descripcion, "", new { @class = "ml-2", style = "color:red" })
                @Html.TextBoxFor(m => m.Descripcion, "", new { @type = "text", @class = "form-control ml-5", style = "width:92%" })
            </div>
            <div class="box-footer" style="text-align:center">
                <label for="file-upload" class="subir">
                    <i class="fas fa-cloud-upload-alt"></i> Subir archivo
                </label>
                <input class="block" id="file-upload" onchange='cambiar()' type="file" style='display: none;' name="Imagen" />
                <div id="info"></div>
            </div>
        </div>
        <div class="box-footer" style="text-align:center">
            <button type="submit" class="btn block btn-success mt-3 mb-3" style="width: 30%" name="crear">Guardar <i class="fa fa-plus-circle"></i></button>
        </div>
    }
</div>

So I hope you can help me and tell me how I could do this part and if you have examples or sites that can support me. Thanks.

UPDATE

Here is the code of my WS...

        public ObtenerEdificio catEdificioObtener(int idEdificio)
        {
            ObtenerEdificio resultado = new ObtenerEdificio();
            try
            {
                using (SqlConnection con = new SqlConnection(strCon))
                {
                    using (SqlCommand com = new SqlCommand("pa_catEdificioObtener", con))
                    {
                        com.CommandType = CommandType.StoredProcedure;
                        com.Parameters.AddWithValue("@idEdificio", idEdificio);
                        con.Open();
                        using (SqlDataReader dr = com.ExecuteReader())
                        {
                            while (dr.Read())
                            {
                                resultado.IdEdificio = int.Parse(dr[0].ToString());
                                resultado.Descripcion = dr[1].ToString();
                                resultado.Imagen = Path.Combine(urlBaseImagenesSubidas, dr[2].ToString());
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                guardaLogGeneral("catEdificioObtener Datos", 0, string.Format("{0} , {1}, {2}", ex.Message, ex.InnerException, ex.StackTrace), "WS");
            }
            return resultado;
        }

        public RespuestaGeneral catEdificioActualiza(ActualizaEdificio cliente)
        {
            RespuestaGeneral resultado = new RespuestaGeneral();
            try
            {
                using (SqlConnection con = new SqlConnection(strCon))
                {
                    using (SqlCommand com = new SqlCommand("pa_catEdificioActualiza", con))
                    {
                        com.CommandType = CommandType.StoredProcedure;
                        com.Parameters.AddWithValue("@idEdificio", cliente.IdEdificio);
                        com.Parameters.AddWithValue("@descripcion", cliente.Descripcion);
                        com.Parameters.AddWithValue("@nombreImagen", cliente.Imagen);

                        con.Open();
                        using (SqlDataReader dr = com.ExecuteReader())
                        {
                            while (dr.Read())
                            {
                                resultado.IdRespuesta = Convert.ToInt32(dr["idRespuesta"].ToString());
                                resultado.Mensaje = dr["mensaje"].ToString();
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                guardaLogGeneral("catEdificioActualiza", cliente.IdEdificio, string.Format("{0} , {1}, {2}", ex.Message, ex.InnerException, ex.StackTrace), "");
                resultado.IdRespuesta = 0;
                resultado.Mensaje = "Se produjo un error inesperado: " + ex.Message;
            }
            return resultado;
        }

Here I leave the code of my models...

public class ActualizaEdificio 
{
    public int IdEdificio { get; set; }
    public string Descripcion { get; set; }
    public string Imagen { get; set; } 
}

public class ObtenerEdificio
{
    public int IdEdificio { get; set; }
    public string Descripcion { get; set; }
    public string Imagen { get; set; } 
}

I am doing a CRUD in ASP.NET MVC but my editing method does not work, I am already trying several ways to do it and in my last attempt I get the following error when I click on the edit button.

The parameter dictionary contains a NULL entry for parameter 'idProfile' of non-nullable type 'System.Int32' of method 'System.Web.Mvc.ActionResult Update (Int32)' on 'AdministraZion.Controllers.ProfilesController'. An optional parameter must be a reference type, a nullable type, or declared as an optional parameter. Parameter name: parameters

Here I leave the complete code, I hope you can help me with my problem.

This is my ViewModel (ProfileViewModel)

public class PerfilViewModel
{
    public int idPerfil { get; set; }
    public string descripcion { get; set; }
    public int idEstatus { get; set; }

    public IEnumerable<SelectListItem> Estatus { get; set; }
}

This is my Controller (ProfilesController)

public ActionResult Update(int idPerfil)
{
    PerfilViewModel vm = new PerfilViewModel();
    using (OrganizacionEntities2 db = new OrganizacionEntities2())
    {
        var t = db.catPerfiles.Find(idPerfil);
        vm.descripcion = t.descripcion;
        vm.idEstatus = (int)t.idEstatus;
        vm.idPerfil = t.idPerfil;
    }

    ViewBag.Estatus = db.catEstatus.Select(x => new SelectListItem
    {
        Text = x.descripcion,
        Value = x.idEstatus.ToString()
    }).ToList();

    return View(vm);
}

[HttpPost]
public ActionResult Update(PerfilViewModel vm)
{
    try
    {
        if (ModelState.IsValid)
        {
            using (OrganizacionEntities2 db = new OrganizacionEntities2())
            {
                var t = db.catPerfiles.Find(vm.idPerfil);
                t.descripcion = vm.descripcion;
                t.idEstatus = vm.idEstatus;

                db.Entry(t).State = System.Data.Entity.EntityState.Modified;
                db.SaveChanges();
                ViewBag.successMessage = "Estatus agregado con exito";
            }
            return Redirect("/Perfiles/");
        }

        ViewBag.Estatus = db.catEstatus.Select(x => new SelectListItem
        {
            Text = x.descripcion,
            Value = x.idEstatus.ToString()
        }).ToList();

        return View(vm);
    }
    catch (Exception ex)
    {
        ViewBag.successMessage = "Ocurrio un error, reintente por favor";
        throw new Exception(ex.Message);
    }
}

This is my View (Update)

@model AdministraZion.ViewModels.PerfilViewModel

@using (Html.BeginForm("Update", "Perfiles", FormMethod.Post))
{
    @Html.HiddenFor(d => d.idPerfil)
    <div class="box-body">
        <div class="form-group">
            <label for="inputDescripcion" class="form-control-label mt-3 ml-5">Descripción:</label>
            @Html.TextBoxFor(m => m.descripcion, "", new { @class = "form-control ml-5", style = "width:92%" })
    </div>
        <div class="form-group">
            <label for="inputEstatus" class="form-control-label ml-5">Estatus:</label>
            @Html.DropDownListFor(m => m.idEstatus, new SelectList(ViewBag.Estatus, "Value", "Text"), "--- Selecciona ---", new { @class = "form-control ml-5", style = "width:92%" })
        </div>
    </div>
    <div class="box-footer" style="text-align:center">
        <button type="submit" class="btn block btn-success mb-3" style="width: 30%" name="crear">Crear <i class="fa fa-plus-circle"></i></button>
    </div>
}

MyRoute.Config _

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Login", action = "Index", id = UrlParameter.Optional }
        );
    }
}

Source code error:

An unhandled exception was thrown during the execution of the current web request. Information about the origin and location of the exception can be identified using the following exception stack trace.

This is the stack trace:

[ArgumentException: The parameter dictionary contains a NULL entry for parameter 'profileid' of non-nullable type 'System.Int32' of method 'System.Web.Mvc.ActionResult Update(Int32)' on 'AdministraZion.Controllers. ControllerProfiles'. An optional parameter must be a reference type, a nullable type, or it must be declared as an optional parameter. Parameter name: parameters] System.Web.Mvc.ActionDescriptor.ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary2 parameters, MethodInfo methodInfo) +527 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary2 parameters) +91 System.Web.Mvc .ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext,