How to make dynamic inclusion of navigation properties?

Question

I\'ve a little problem. Assuming a Entity like this

public class FirstEntity
{
    public int ID { get; set; }
    public string Prop1 { get; set; }
    publ         


        

Answer 1

Parameterize with a Func, IQueryable>.

And instead of .Select(r => r) you can simply use .AsQueryable().

public IQueryable GetBySpecification(ISpecification spec = null, bool tracking = true, params Func, IQueryable>[] includes)
{
    var query = _context.Set().AsQueryable();
    if (!tracking)
        query = query.AsNoTracking();
    if (includes != null)
        foreach (var include in includes)
            query = include(query);
    if (spec != null)
        query = query.Where(spec.Expression);
    return query;
}

return GetBySpecification(
    includes: new Func, IQueryable>[]
    {
        (q) => q.Include(u => u.Roles).ThenInclude(r => r.Permissions),
    });