Sessions in MVC 5 asp.net - asp.net-mvc

Question

I am doing a project about an Chinese food ordering system, and I am wanting show selected items in a view on another page. I am trying to use sessions, but I keep getting different errors, like "The model item passed into the dictionary is of type" and "object reference is not set to an instance of an object". How can I select the data, and show them in a different view? The project is linked up to a database, the DishID and other instances should be connected through the database.
Controller:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using KinaRest.Models;
using KinaRest.View_Models;
using KinaRest.Infrastructure;
namespace KinaRest.Controllers
{
public class TakeawayController : Controller
{
private Basket basket = new Basket();
[ChildActionOnly]
public ActionResult BasketItemsList()
{
Basket basket = new Basket();
return View("_Basket", basket.Items);
}
// GET: /Takeaway/
private ChinaContext db = new ChinaContext();
[HttpGet]
public ActionResult Index()
{
return View(db.Dish.ToList());
}
[HttpPost]
public ActionResult Index(BasketItem basketItem)
{
//Repository repository = new Repository();
if (Session["Basket"] == null)
{
Session["Basket"] = new Basket();
}
else
{
basket = (Basket)Session["Basket"];
}
basket.AddItem(basketItem);
return View("Test");
}
}
}
Model 1: Basket
namespace KinaRest.Infrastructure
{
public class Basket
{
private List<BasketItem> items = new List<BasketItem>();
public List<BasketItem> Items { get { return items; } }
public void AddItem(BasketItem bi) {
items.Add(bi);
}
}
}
Model 2: BasketItem
namespace KinaRest.Infrastructure
{
public class BasketItem
{
public int DishId {get; set; }
public int Number { get; set; }
public decimal Price { get; set; }
}
}
In this view, we are trying to collect the data, such as the ID, the quantity(number) and price with a form:
#model IEnumerable<KinaRest.Models.Dish>
#{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
<div class="form-group">
#using (Html.BeginForm())
{
foreach (var item in Model)
{
<div class="col-md-10">
#Html.DisplayFor(modelItem => item.DishId)
</div>
<div class="col-md-10">
#Html.DisplayFor(modelItem => item.Title)
</div>
<div class="col-md-10">
#Html.DisplayFor(modelItem => item.Price)
</div>
<div class="col-md-10">
#Html.DisplayFor(modelItem => item.Description)
</div>
<div class="col-md-10">
#Html.DisplayFor(modelItem => item.Type.Type1)
</div>
<img src="#Url.Content("~/content/images/" + item.Image)" />
#Html.EditorFor(model => item.Number, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => item.Number, "", new { #class = "text-danger" })
<input type="submit" value="Tilføj" class="btn btn-default" />
}
}
</div>
In this view, we are trying to access the sessions data:
#model List<KinaRest.Infrastructure.BasketItem>
#{
ViewBag.Title = "Test";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Test</h2>
<ul>
#foreach (var item in Model)
{
<li>
#Html.DisplayFor(modelItem => item.Number)
</li>
}
</ul>
and yes, I am new to MVC and I am still learning. Hope you guys can help.

Answer 1

[HttpGet]
public ActionResult Order(int id)
{
Dish dish = db.Dish.Single(d=> d.DishId == id); //database call here
BasketItem basketItem = new BasketItem(){DishId = dish.?, Number = dish.?, Price = dish.Price }; // create a new BasketItem
Basket basket; //create reference outside if block
//Repository repository = new Repository();
if (Session["Basket"] == null)
{
basket = new Basket();
Session["Basket"] = basket;
}
else
{
basket = (Basket)Session["Basket"];
}
basket.AddItem(basketItem);
return View("Test", basket.Items); //or return View(((Basket)Session["Basket"]).Items); // give the view the data
}
take out the class field basket. As far as i know the controller is instanciated every time when a request is to be processed
View for ordering
#model IEnumerable<KinaRest.Models.Dish>
#{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
<table>
<tr><th></th><th>Dish</th><th></th></tr>
#foreach(var item in Model)
{
<tr><td><img src="#Url.Content("~/content/images/" + item.Image)" /></td><td>#html.displayfor(item => item.Name)</td><td>#Html.ActionLink("Add", "Order", "TakeAway", new {id = item.DishId})</td></tr>
}
</table>