LazyLoading not working in my entity using .net

Question

Lazy loading is not working on my entity.

Here is my class:

public class Pergunta
{
    [Key]
    public int Id { get; set; }
    public string Descricao { get; set; }
    public string Alias { get; set; }        
    public int CategoriaId { get; set; }
    public virtual Categoria Categoria { get; set; }
}

And this is the class Categoria:

public class Categoria
{
    [Key]
    public int Id { get; set; }
    public string Descricao { get; set; }
}

But when I call this endpoint:

public async Task<IActionResult> Index()
{
    List<Pergunta> teste = await _context.Pergunta.ToListAsync();
    return _context.Pergunta != null ?
                      View(await _context.Pergunta.ToListAsync()) :
                      Problem("Entity set 'SistemaJustificativasContext.Pergunta'  is null.");
}

The var teste says that Categoria is null:

Why is the lazy loading not working? Did I forget something?

Answer 1

Try this

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
=> optionsBuilder
    .UseLazyLoadingProxies()
    .UseSqlServer(myConnectionString);

see more details out there https://learn.microsoft.com/en-us/ef/core/querying/related-data/lazy as @scotty13 suggested.