Question

Possible Duplicate:
Entity Framework: There is already an open DataReader associated with this Command

I have these classes:

    public class VwSelectBrochures
{
    public List<SelectBrochure> SelectBrochures { get; set; }
}

   public class SelectBrochure
{
    public int BrochureId { get; set; }
    public string UrlImage { get; set; }
    public string Description { get; set; }
    public string Cat1Description { get; set; }
    public string Cat2Description { get; set; }
    public string Cat3Description { get; set; }
    public List<LangSelection> Languages { get; set; }
}

public class LangSelection
{
    public int Id { get; set; }
    public string Description { get; set; }
    public bool Vink { get; set; }
}

and this line of code:

var dbmodel2 =
from x in
    brochures.AsEnumerable().Select(
        x => new SelectBrochure {BrochureId = x.Id, Description = x.Description, UrlImage = x.UrlImage,
        Languages = new List<LangSelection>(from y in x.BrochureLanguages select new LangSelection(){Description = y.Language.Description, Id = y.Language.Id})})
select x;

Brochures and BrochureLanguages are my db-models.

I know I get the error, because I can’t do the “from y in x.BrochureLanguages”, but I don’t see how I can fix this.

What I really want is to get all the brochures into the VwSelectBrochures class.

Answer 1

The easiest way is to bring the whole brochures into the memory (using ToList()) first:

var dbmodel2 =
from x in
    brochures.ToList().Select(
        x => new SelectBrochure {BrochureId = x.Id, Description = x.Description, UrlImage = x.UrlImage,
        Languages = new List<LangSelection>(from y in x.BrochureLanguages select new LangSelection(){Description = y.Language.Description, Id = y.Language.Id})})
select x;

This way when running from y in ... there is no other DataReader open. I think there is another option using a join.