Select specific properties from include ones in entity framework core

Question

I use Entity Framework Core 2.0 and have this 2 classes:

News

public class News
{
    public int Id { get; s         


        

Answer 1

Instead of using an anonymous object, you can return from your infra layer a method IQueryable GetAll() and just do an context.NewsTable.Include(x => x.Author). Obs: Note that you're just returning a query and not retrieving data from your DB at this point.

Then you create a NewsDTO class with the properties you want to retrieve (example bellow).

public class NewsDTO
{
    public int Id { get; set; }
    public string Title{ get; set; }
    public string Text { get; set; }
    public DateTime ReleaseDate{ get; set; }
    public string AuthorName { get; set; }
}

I prefer to use AutoMapper, your code will be cleaner, List newsDtoList = _repository.GetAll().ProjectTo().ToList()

But you can do using this odd kind

List newsDtoList = _repository.GetAll()
.Select(x => new NewsDTO
        {
            Id = x.Id.,
            Title = x.Title,
            Text = x.Text,
            ReleaseDate = x.ReleaseDate,
            AuthorName = x.Author.Username
        }).ToList();

You finish your command using .ToList(), at this point you retrieve your data, just one select with the fields you defined in your mapping configuration or in your select.