Untitled

/*the view (htmlcs) in question that displays no listings available if it thinks my model is null*/
@model IEnumerable<WebApplication1.Models.ListingProjects>

@{
  ViewData["Title"] = "Dashboard";
  var listingMd = Model?.First();
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>TestDashboard1</title>
    <style>
        .listing { margin-bottom: 20px; padding: 10px; border: 1px solid #ccc; border-radius: 5px; }
        .listing img { width: 100px; height: auto; }
    </style>
</head>
<body>
<div id="listings-container"></div>
@if (listingMd != null)
               {
                   <p>listing is not null</p>
                   <h2>Test index: @(listingMd.ListingName ?? "null null")</h2> <!-- Use null-coalescing operator for ListingName -->
                   <p>Age: @(listingMd.Id != null ? listingMd.Id.ToString() : "Not Provided")</p>
                   <p>Location: @(listingMd.CategoryId != null ? listingMd.CategoryId.ToString() : "Not Provided")</p>
               }
               else
               {
                   <p>No listings available.</p> <!-- Fallback content if Model is empty -->
               }

/*the model*/
namespace WebApplication1.Models;

public class ListingProjects
{
    public int? Id { get; set; }
    public string? ListingName { get; set; }
    public string? ImageUrl { get; set; }

    //Navigation properties to child model classes
    public int? CategoryId { get; set; }
    public Category? Category { get; set; }

    public int? LocationId { get; set; }
    public Location? Location { get; set; }
}

/* controller */
private readonly HttpClient _httpClient;
    private readonly ApplicationDbContext _context;

    public HomeController(HttpClient httpClient, ApplicationDbContext context)
    {
        _httpClient = httpClient;
        _context = context;
    }

[AllowAnonymous]
    public IActionResult JumpToDashboard()
    {
        var listingUp = _context.ListingDBTable
            .Select(u => new WebApplication1.Models.ListingProjects()
            {
                ListingName = "Keong Saik Road 8",
                ImageUrl = "",
                CategoryId = 1,
                LocationId = 1
            }).ToList();
        //JSON can refer this
        var listingProject = new ListingProjects
        {
            ListingName = "Keong Saik Road 8",
            ImageUrl = "",
            CategoryId = 1,
            LocationId = 1

        };

        //Access category and location information
        var categoryName = new Category
        {
            propertyName = "Holiday Suites",
            propertyType = "hotel establishment"
        };

        var city = new Location
        {
              City = "Venezia",
              State = "Venezia",
              PLZ = "2349890"
        };
        ViewData["PropertyListings"] = listingProject;
        ViewData["ListingCategories"] = categoryName;
        ViewData["Cities"] = city;

        //add try catch
        return View(listingUp);
    }

/*ApplicationDbContext class */
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using WebApplication1.Models;

namespace WebApplication1.Data;

public class ApplicationDbContext : IdentityDbContext<PortalUsers>
{
    public ApplicationDbContext(){}
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
        : base(options)
    {
    }

    public Microsoft.EntityFrameworkCore.DbSet<PortalUsers> UsersDBTable { get; set; }
    public Microsoft.EntityFrameworkCore.DbSet<Category> CategoriesDBTable { get; set; }
    public Microsoft.EntityFrameworkCore.DbSet<ListingProjects> ListingDBTable { get; set; }
    public Microsoft.EntityFrameworkCore.DbSet<Location> LocationDBTable { get; set; }


}