NullReferenceException: Object reference not set to an instance of an object.

Question

User577052021 posted

Hi everybody! I have got the following exception while running code in ASP.NET MVC and requested to help me

"NullReferenceException: Object reference not set to an instance of an object.

AspNetCore.Views_Home_Index.ExecuteAsync() in Index.cshtml, line 10

NullReferenceException: Object reference not set to an instance of an object.

• AspNetCore.Views_Home_Index.ExecuteAsync() in Index.cshtml

  
  
  10. <h2>@Model.PlayerName.Count()</h2> "

Code details is given below

HomeController.cs

namespace Leave_Management.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {

            Models.Raptors player = new Models.Raptors();
            
                player.PlayerName = "XYZ";
            player.ArivalDate = new DateTime(2020, 2, 20);
           
            return View();
           
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

index.cshtml

<div class="text-center">
    <h1 class="display-4">Welcome</h1>
    <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
    <h1> This is my <b> first assignment</b></h1>
    <h2>@Model.PlayerName.Count()</h2>
    <span>has signed agreement on @Model.ArivalDate.ToString()</span>

</div>

model.cs code

namespace Leave_Management.Models
{
    public class Raptors
    {
        public string PlayerName { get; set; }
        public DateTime ArivalDate { get; set; }
    }
}

Answer 1

User475983607 posted

You did not pass the model to the View.  Plus the Count will give you the string length.

I think you'll be interested in going through the Getting Started tutorials in this site to learn the MVC best practices and standard programming patterns.

https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/start-mvc?view=aspnetcore-5.0&tabs=visual-studio

https://docs.microsoft.com/en-us/aspnet/core/data/ef-mvc/?view=aspnetcore-5.0

Answer 2

User1312693872 posted

Hi,Tariqbaabaa

You should pass the player to the view, or the view can't get the model value:

public IActionResult Index()
            {
                Raptors player = new Raptors();
                player.PlayerName = "XYZ";
                player.ArivalDate = new DateTime(2020, 2, 20);
                return View(player);
            }

You can learn tutorials in mgebhard's links.

Best Regards,

Jerry Cai

Answer 3

User577052021 posted

Dear Jerry Cai,

Thank you very much indeed for the support.

Regards

Tariq

Answer 4

User577052021 posted

Thank for the guidance.

Regards

Tariq