ASP.NET MVC View is showing NULL

Question

I have a Controller that I have hard coded some values and expect the values to populate the 2 models with the data. However, there is one Model that is null when I run through the controller. Here are some snippets of the app.

When I run the code, Orders is null. I would expect there be 3 entries in customer orders but that is null.

CustomerOrderModel.cs:

public class CustomerOrderModel
{
    public int OrderId { get; set; }
    public DateTime OrderDate { get; set; }
    public string Description { get; set; }
    public decimal Total { get; set; }
}

CustomerViewModel.cs:

public class CustomerViewModel
{
    public int CustomerNumber { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName
    {
        get { return FirstName + " " + LastName; }
    }
    public List<CustomerOrderModel> Orders { get; set; }
}

Controller.cs:

public IActionResult Orders()
{
    decimal iTotal = 55.23M;
    CustomerViewModel customer = new CustomerViewModel();
    List<CustomerOrderModel> orders = new List<CustomerOrderModel>();

    try
    {
        for (int i = 1; i < 4; i++)
        {
            var order = new CustomerOrderModel();
            customer.CustomerNumber = 111111;
            customer.FirstName = "John";
            customer.LastName = "Smith";

            order.OrderId = i;
            order.OrderDate = DateTime.Now;
            order.Description = "Part " + i;
            order.Total = iTotal;
            iTotal += order.Total;

            orders.Add(order);
        }
        
        return View(customer);
    }
    catch (Exception)
    {
        return View("Error");
    }
}

I have tried to re-code the IActionResult Orders() without any luck. customer.Orders gives me no members.

Re-code Orders

public IActionResult Orders1()
{
    decimal iTotal = 55.23M;
    List<CustomerOrderModel> orders = new List<CustomerOrderModel>();

    for (int i = 1; i < 4; i++)
    {
        CustomerViewModel customer = new CustomerViewModel();
        customer.Orders = new List<CustomerOrderModel>();
        customer.CustomerNumber = 111111;
        customer.FirstName = "John";
        customer.LastName = "Smith";
    }
    return View();
}

ASP.NET MVC (on the full, classic, Windows-only .NET framework) - or ASP.NET Core MVC ? You've tagged both - please be precise! — marc_s
– marc_s, Commented Dec 1, 2022 at 21:29
Please edit your question to include your code as text rather than as screenshot(s). On stack overflow images should not be used for textual content, see Why should I not upload images of code/data/errors? and Discourage screenshots of code and/or errors for why. For instructions on formatting see How do I format my code blocks?. A minimal reproducible example showing what you have tried that did not work would maximize your chances of getting help. See How to Ask. — dbc
– dbc, Commented Dec 1, 2022 at 21:52

Victor · Accepted Answer · 2022-12-01 23:47:51Z

1

In the public IActionResult Orders() action method set the Orders property value before render the view:

customer.Orders = orders; 
return View(customer);

The reference type default value is null and this what you see.

Default values of C# types (C# reference)

edited Dec 1, 2022 at 23:47

answered Dec 1, 2022 at 23:40

Victor

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