Error during iterates list iin C#

Question

1.00/5 (1 vote)

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I have a List with employees with previously loaded values. I try to iterates them in a view with a foreach but there is no way it works. I have an error when compile:

The model element passed to the dictionary is of type 
'Humano2.Models.Alumno', but this dictionary requires a model element of type 'System.Collections.Generic.List1 [Humano2.Models.Alumno]'

.

What I have tried:

Class persona

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Humano2.Models
{
    public class Persona
    {
        public int Dni;
        public string Nombre;
        public Persona()
        {


        }
     }   

}

Class alumno

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Humano2.Models
{


    public class Alumno : Persona
    {

        public int Edad;

        public Alumno(string nombre):base()
        {
            Edad = 18;
            if (lista.Count == 0)
            {
                this.altaAlumno(1111, "Julian", 20);
                this.altaAlumno(2222, "Pedro", 30);
                this.altaAlumno(3333, "Pablo", Edad);
            }
        }


        public Alumno(int edad):this()
        {
            this.Edad = edad;
        }
        public Alumno()
        {
            this.Nombre = "NN";
        }

        public static List<Alumno> lista = new List<Alumno>();

        public void altaAlumno(int Dni, string Nombre, int Edad)
        {
            lista.Add(new Alumno() { Dni = Dni, Nombre = Nombre, Edad = Edad });
        }
    }

controller

using Humano2.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Humano2.Controllers
{
    public class HomeController : Controller
    {
        // GET: Home
        public ActionResult Index()
        {


            Alumno p1 = new Alumno();
return View(p1);



        }
    }

}

View

@model List<Humano2.Models.Alumno>
    Layout = null;
    }

    <!DOCTYPE html>

    <html>
    <head>
        <meta name="viewport" content="width=device-width" />
        <title>Index</title>
    </head>
    <body>
        <div>
             @foreach (Humano2.Models.Alumno c in Model)
        {
            <p>@c.Nombre</p>
           <p>@c.Dni</p>
           <p>@c.Edad</p>
        }

        </div>
    </body>
</html>

Posted 14-May-17 6:38am

Member 12817768

Updated 14-May-17 18:40pm

PIEBALDconsult

v2

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pradiprenushe · Accepted Answer · 2017-05-14T18:40:00

Solution 1

You are returning single Alumno entity to view

Alumno p1 = new Alumno();
return View(p1);

And using as list in view.

First clear your requirement. Are you really want to show list on view if not then dont use list in view.

Two option

1. Either remove list from view

2. Pass list of alumno from controller

List<Alumno> p1 = new List<Alumno>();
            p1.Add(new Alumno());
            return View(p1);

Posted 14-May-17 18:40pm

pradiprenushe

Updated 14-May-17 18:48pm

v3

Comments

Member 12817768 15-May-17 18:11pm

don´t work, in the view shows NN 0 0

pradiprenushe 16-May-17 1:04am

THis correct output. You are create object which uses parameter-less constructor. so Nombre value is set. Other have default values.

This constrcutor is called when you are creating object
public Alumno()
{
this.Nombre = "NN";
}

Member 12817768 16-May-17 12:47pm

thank you

pradiprenushe 17-May-17 2:30am

Welcome