Does not contain a definition for "Add"

asp.net-mvc, asp.net-mvc-4, c#, entity-framework

Solution

Try this:

public partial class ANIME
{

    public int ID_AN { get; set; }
    public string TITLE_OR { get; set; }
    public string TITLE_EN { get; set; }

    public virtual ICollection<GENRES> GENRES { get; set; } // Use ICollection here
}

Problem

I'm trying to make the same thing like in this thread, but I'm getting error: 'System.Collections.Generic.IEnumerable' does not contain a definition for 'Add' and no extension method 'Add' accepting a first argument of type 'System.Collections.Generic.IEnumerable' could be found (are you missing a using directive or an assembly reference?) Here is my code: ``` [HttpPost] public ActionResult Create(ANIME anime) { var db = new MainDatabaseEntities(); var newanime = new ANIME { ID_AN = anime.ID_AN, TITLE_OR = anime.TITLE_OR, TITLE_EN = anime.TITLE_EN, GENRES = new List<GENRES>() }; foreach (var selectedAnime in anime.GENRES.Where(c => c.isSelected)) { var genre = new GENRES { ID_GE = selectedAnime.ID_GE }; db.GENRES.Attach(genre); newanime.GENRES.Add(genre); <--- this is the error line } db.ANIME.Add(newanime); db.SaveChanges(); return RedirectToAction("Index"); } ``` ANIME: ``` public partial class ANIME { public int ID_AN { get; set; } public string TITLE_OR { get; set; } public string TITLE_EN { get; set; } public virtual IEnumerable<GENRES> GENRES { get; set; } } ``` GENRES: ``` public partial class GENRES { public int ID_GE { get; set; } public string GENRE { get; set; } public bool isSelected { get; set; } public virtual ICollection<ANIME> ANIME { get; set; } } ``` The error is in the line `newanime.GENRES.Add(genre)` in `HttpPost`. I added `using System.Linq` to all models and controllers but it doesn't help. Any ideas how to resolve this? EDIT: After repairing this a new error arrived. I think it's not related to above one but I don't want to spam unnecessary threads. Error message: The entity or complex type 'MainDatabaseModel.GENRES' cannot be constructed in a LINQ to Entities query. Related code: ``` public ActionResult Create() { var db = new MainDatabaseEntities(); var viewModel = new ANIME { GENRES = db.GENRES.Select(c => new GENRES { ID_GE = c.ID_GE, GENRE = c.GENRE, isSelected = false }).ToList() }; return View(viewModel); } ```

Original source

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