Cannot access list, created in index.cshtml.cs, in the index.cshtml

Question

I'm trying to create a simple site, but when I try to access a list in the index.cshtml, which I created in the index.cshtml.cs, it says it doesn't exist.

Content of the index.cshtml.cs file:

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Data.SqlClient;

namespace Proiectss.Pages
{
    public class IndexModel : PageModel
    {
        public List<ClientInfo> listClients = new List<ClientInfo>();
        private readonly ILogger<IndexModel> _logger;
    
        public IndexModel(ILogger<IndexModel> logger)
        {
            _logger = logger;
            ViewData["listClients"] = HttpContext.Features.Get<Proiectss.Pages.Clients.IndexModel>().listClients;
        }
    
        public void OnGet()
        {
            try
            {
                String connectionString = "Data Source=.\\sqlexpress;Initial Catalog=spital;Integrated Security=True";

                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                    connection.Open();

                    string sql = "SELECT * FROM clients";

                    using (SqlCommand command = new SqlCommand(sql, connection))
                    {
                        using (SqlDataReader reader = command.ExecuteReader())
                        {
                            while(reader.Read())
                            {
                                ClientInfo clientInfo = new ClientInfo();
                                clientInfo.id = "" + reader.GetInt32(0);
                                clientInfo.name = reader.GetString(1);
                                clientInfo.email = reader.GetString(2);
                                clientInfo.phone = reader.GetString(3);
                                clientInfo.adress = reader.GetString(4);
                                clientInfo.created_at = reader.GetDateTime(5).ToString();
    
                                listClients.Add(clientInfo); 
                            }
                        }
                    }
                }
            }
            catch(Exception ex)
            {
                Console.WriteLine("Exception: " + ex.ToString());
            }
        }
    }

    public class ClientInfo
    {
        public String id;
        public String name;
        public string email;
        public String phone;
        public String adress;
        public String created_at;
    }
}

Content of the index.cshtml:

@page
@model Proiectss.Pages.Clients.IndexModel
@{

}
<br>

<h2>List of Clients</h2>

<a href="/Clients/Create">`New Client`</a>

            ID
            Name
            Email
            Phone
            Adress
            Created At
            Action
    
    @foreach (var item in Model.listClients) /* this is where I get the error */
    {
            @item.id
            @item.name
            @item.email
            @item.phone
            @item.adress
            @item.created_at
    }

I am trying to access the list, but I can't.

Answer 1

Within your index.cshtml, you are defining your model as Proiectss.Pages.Clients.IndexModel, but the namespace in your index.cstml.cs is Proiectss.Pages.
Meaning that the model that you are using in your cshtml file is not the same as the one you posted in the index.cshtml.cs.

Furthermore, you do not need this line in your 'Ctor of IndexModel

ViewData["listClients"] = HttpContext.Features.Get<Proiectss.Pages.Clients.IndexModel>().listClients;

The OnGet() method will be called by the framework and when your used model in your razor page matches the class that you posted here, the public property listClients will be filled and usable within your razor page.

How it looks like to me, is that you have two IndexModel classes and are attempting to use the wrong one.
My suggestion would be to move the listClients property and OnGet() method from the Proiectss.Pages.IndexModel class to the Proiectss.Pages.Clients.IndexModel class, then everything should work as you expect them to.