cs11dotnet7/vscode/PracticalApps/Northwind.Web/Pages/Customers.cshtml.cs

using Microsoft.AspNetCore.Mvc.RazorPages; // PageModel
using Packt.Shared; // Customer

namespace Northwind.Web.Pages;

public class CustomersModel : PageModel
{
  public ILookup<string?, Customer>? CustomersByCountry;

  private NorthwindContext db;

  public CustomersModel(NorthwindContext db)
  {
    this.db = db;
  }

  public void OnGet()
  {
    CustomersByCountry = db.Customers.ToLookup(c => c.Country);
  }
}