C#•2y ago

I'm getting an error "object reference not set to an instance of an object"

the code:

@model IEnumerable<WebApp.Models.Produkt>

<h1>a List</h1>

@if (Model == null || !Model.Any())
{
    <p>No products available.</p>
}
else
{
    @foreach (var product in Model)
    {
        if (product != null)
        {
            <li>
                <b>@product.name</b> - @product.category
                <a href="@Url.Action("Details", "Warehouse", new { id = product.id })">Details</a>
                <button>Delete</button>
            </li>
        }
    }
}

@model IEnumerable<WebApp.Models.Produkt>

<h1>a List</h1>

@if (Model == null || !Model.Any())
{
    <p>No products available.</p>
}
else
{
    @foreach (var product in Model)
    {
        if (product != null)
        {
            <li>
                <b>@product.name</b> - @product.category
                <a href="@Url.Action("Details", "Warehouse", new { id = product.id })">Details</a>
                <button>Delete</button>
            </li>
        }
    }
}

@model IEnumerable<WebApp.Models.Produkt>

<h1>a List</h1>

@if (Model == null || !Model.Any())
{
    <p>No products available.</p>
}
else
{
    @foreach (var product in Model)
    {
        if (product != null)
        {
            <li>
                <b>@product.name</b> - @product.category
                <a href="@Url.Action("Details", "Warehouse", new { id = product.id })">Details</a>
                <button>Delete</button>
            </li>
        }
    }
}

@model IEnumerable<WebApp.Models.Produkt>

<h1>a List</h1>

@if (Model == null || !Model.Any())
{
    <p>No products available.</p>
}
else
{
    @foreach (var product in Model)
    {
        if (product != null)
        {
            <li>
                <b>@product.name</b> - @product.category
                <a href="@Url.Action("Details", "Warehouse", new { id = product.id })">Details</a>
                <button>Delete</button>
            </li>
        }
    }
}

It appears that Model is null but I don't know how to fix it

Angius•5/22/24, 7:49 PM

What's the controller?

AAngius What's the controller?

IamMax420OP•5/22/24, 7:53 PM

You mean the controller name? it's WarehouseController

Angius•5/22/24, 7:53 PM

The code

Angius•5/22/24, 7:53 PM

You seem to not be sending any data to the view

IamMax420OP•5/22/24, 7:54 PM

here's the code:

using Microsoft.AspNetCore.Mvc;
using WebApp.Models;
using WebApp.Services.Interfaces;

namespace WebApp.Controllers
{
    public class WarehouseController : Controller
    {
        private readonly IWarehouseService _warehouseService;
        public WarehouseController(IWarehouseService warehouseService)
        {
            _warehouseService = warehouseService;
        }
        public IActionResult Index()
        {
            return View();
        }
        [HttpGet]
        public IActionResult Add()
        {
            return View();
        }
        [HttpPost]
        public IActionResult Add(Produkt body)
        {
            if(!ModelState.IsValid)
            {
                return View(body);
            }
            //logika do zapisu produktu

            var id = _warehouseService.Save(body);

            ViewData["ProductId"] = id;
            TempData["ProductId"] = id;

            return RedirectToAction("List1");
        }
        [HttpGet]
        public IActionResult List1()
        {
            var products = _warehouseService.GetAllProdukts();
            return View();
        }
        [HttpGet]
        public IActionResult Details(int id)
        {
            var product = _warehouseService.Get(id);
            return View();
        }
        [HttpDelete]
        public IActionResult Delete(int id)
        {
            _warehouseService.Delete(id);
            return RedirectToAction("List1");
        }
    }
}

using Microsoft.AspNetCore.Mvc;
using WebApp.Models;
using WebApp.Services.Interfaces;

namespace WebApp.Controllers
{
    public class WarehouseController : Controller
    {
        private readonly IWarehouseService _warehouseService;
        public WarehouseController(IWarehouseService warehouseService)
        {
            _warehouseService = warehouseService;
        }
        public IActionResult Index()
        {
            return View();
        }
        [HttpGet]
        public IActionResult Add()
        {
            return View();
        }
        [HttpPost]
        public IActionResult Add(Produkt body)
        {
            if(!ModelState.IsValid)
            {
                return View(body);
            }
            //logika do zapisu produktu

            var id = _warehouseService.Save(body);

            ViewData["ProductId"] = id;
            TempData["ProductId"] = id;

            return RedirectToAction("List1");
        }
        [HttpGet]
        public IActionResult List1()
        {
            var products = _warehouseService.GetAllProdukts();
            return View();
        }
        [HttpGet]
        public IActionResult Details(int id)
        {
            var product = _warehouseService.Get(id);
            return View();
        }
        [HttpDelete]
        public IActionResult Delete(int id)
        {
            _warehouseService.Delete(id);
            return RedirectToAction("List1");
        }
    }
}

Angius•5/22/24, 7:55 PM

And which action gives you a null?

IamMax420OP•5/22/24, 8:03 PM

these two: [HttpGet]

[HttpGet]
        public IActionResult List1()
        {
            var products = _warehouseService.GetAllProdukts();
            return View();
        }
        [HttpGet]
        public IActionResult Details(int id)
        {
            var product = _warehouseService.Get(id);
            return View();
        }

[HttpGet]
        public IActionResult List1()
        {
            var products = _warehouseService.GetAllProdukts();
            return View();
        }
        [HttpGet]
        public IActionResult Details(int id)
        {
            var product = _warehouseService.Get(id);
            return View();
        }

IamMax420OP•5/22/24, 8:03 PM

but after doing return View(products); and return View(product) respectively, it seems to be working now

IamMax420OP•5/22/24, 8:04 PM

crazy how sometimes such small oversights can cost you 30 mins or even an hour of trying to figure out what is going on lol

IamMax420OP•5/22/24, 8:04 PM

thanks though @ZZZZZZZZZZZZZZZZZZZZZZZZZ

Angius•5/22/24, 8:05 PM

Yeah, I was about to point you to the fact that you don't pass anything to the view in most of those actions lol

Angius•5/22/24, 8:05 PM

Glad you noticed it

using Microsoft.AspNetCore.Mvc; using WebApp.Models; using WebApp.Services.Interfaces; namespace WebApp.Controllers { public class WarehouseController : Controller { private readonly IWarehouseService _warehouseService; public WarehouseController(IWarehouseService warehouseService) { _warehouseService = warehouseService; } public IActionResult Index() { return View(); } [HttpGet] public IActionResult Add() { return View(); } [HttpPost] public IActionResult Add(Produkt body) { if(!ModelState.IsValid) { return View(body); } //logika do zapisu produktu var id = _warehouseService.Save(body); ViewData["ProductId"] = id; TempData["ProductId"] = id; return RedirectToAction("List1"); } [HttpGet] public IActionResult List1() { var products = _warehouseService.GetAllProdukts(); return View(); } [HttpGet] public IActionResult Details(int id) { var product = _warehouseService.Get(id); return View(); } [HttpDelete] public IActionResult Delete(int id) { _warehouseService.Delete(id); return RedirectToAction("List1"); } } }

[HttpGet] public IActionResult List1() { var products = _warehouseService.GetAllProdukts(); return View(); } [HttpGet] public IActionResult Details(int id) { var product = _warehouseService.Get(id); return View(); }

I'm getting an error "object reference not set to an instance of an object"

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