C#•15mo ago

✅ Working with repository in ASP.NET

I'm trying to use an orderRepository. But when i use it i get the message in my index.cshtml file: System.NullReferenceException: 'Object reference not set to an instance of an object.'

9 Replies

EliasGPS•15mo ago

Now in my OrderController i have a method Index that looks like this:

 public IActionResult Index()
        {
            /*var orders = _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product).ToList();*/
            var orders = orderRepository.All();
            return View(orders);
        }

 public IActionResult Index()
        {
            /*var orders = _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product).ToList();*/
            var orders = orderRepository.All();
            return View(orders);
        }

the orders variable that is in comment works. But my repo not. The All method looks like follows:

public override IEnumerable<Order> All()
        {
            return _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product)
                .ToList();
        }

public override IEnumerable<Order> All()
        {
            return _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product)
                .ToList();
        }

so basically when i use this code in my Index:

/*var orders = _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product).ToList();*/

/*var orders = _context.Orders
                .Include(order => order.Orderlines)
                .ThenInclude(orderline => orderline.Product).ToList();*/

everything works but i want to use the repo

jalepi•15mo ago

it seems you are missing registering that dependency. dependency injection registrations are typically done inside Program.cs by services.AddSingleton, or AddTransient or AddScoped

EliasGPS•15mo ago

yeah yeah i think i found something but i reagisterd it

EliasGPS•15mo ago

EliasGPS•15mo ago

but i think the issue is in my OrderController i do it like this:

EliasGPS•15mo ago

EliasGPS•15mo ago

so i'm calling the GenericRepository instead of the Orderrepository yeah i found it if i use this code in my OrderController is works:

EliasGPS•15mo ago

jalepi•15mo ago

nice, congrats!

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✅ Working with repository in ASP.NET