Error: The entity or complex type cannot be constructed in a LINQ to Entities query

Question

I have a problem with join query with MVC and i dont know why.

The entity or complex type \'Tusofona_Website.Models.site_noticias\' cannot be construc

Answer 1

You can't project onto a mapped entity (see this answer).

However, you can do a couple of things:

1) Select an anonymous type instead of entity like:

var query = (from sd in db.site_desquesnoticias
                    join sn in db.site_noticias on sd.IDNoticia equals sn.IDNoticia
                    where sn.Destaque == 1
                    select new {
                        CorpoNoticia = sn.CorpoNoticia,
                        TituloNoticia = sn.TituloNoticia
                    }).ToList();

2) Invert your query to select the site_noticias directly. That depends on the query and the data that you would like to retrieve. For example, you can have a look if the following will work and give you the data that you need:

var query = (from sd in db.site_desquesnoticias
                    join sn in db.site_noticias on sd.IDNoticia equals sn.IDNoticia
                    where sn.Destaque == 1
                    select sn).ToList();

3) Use some DTO (Data transfer object) to project the properties that you want to select on to:

   public class SiteNoticiasDTO{
     public string CorpoNoticia {get;set;}
     public string TituloNoticia {get;set;}
    }

var query = (from sd in db.site_desquesnoticias
                    join sn in db.site_noticias on sd.IDNoticia equals sn.IDNoticia
                    where sn.Destaque == 1
                    select new SiteNoticiasDTO {
                        CorpoNoticia = sn.CorpoNoticia,
                        TituloNoticia = sn.TituloNoticia
                    }).ToList();