Question

I have an error:

One or more validation errors were detected during model generation:

\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'DynamicMenu' has no key defined.    Define the key for this EntityType.
\tSystem.Data.Entity.Edm.EdmEntitySet: EntityType: EntitySet 'ambt_Dynamic_Menu' is based on type 'DynamicMenu' that has no keys defined.

in helper class which code is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Data.Models;
using Data;

namespace Ambermoda.Web
{
    public class MenuHelper
    {
        public static List<DynamicMenu> GetMenu()
        {
            DataContext db = new DataContext();
            List<DynamicMenu> list = db.ambt_Dynamic_Menu.ToList();

            return list;
        }
    }
}

so I have no idea how can I solve it. I checked everything what (in my opinion) can generate this error, but with any results.

I sam similar posts but any of them doesn’t solve my problem.

If anybody have some idea, pleas write it 🙂

Thanks!

Some more code

DynamicMenu.cs

    [Table("abmt_Dynamic_Menu")]
    public class DynamicMenu
    {
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int dmn_id { get; set; }
        public string dmn_code { get; set; }
        public string dnm_parent_code { get; set; }
        public string dnm_title { get; set; }
        public string dnm_title_en { get; set; }
        public int dnm_order { get; set; }
    }

DataContext.cs

public class DataContext : DbContext
{
    public DataContext() { }

    public DbSet<DynamicMenu> ambt_Dynamic_Menu { get; set; }
}

Connection string:

<add name="DataContext" providerName="System.Data.SqlClient" connectionString="Data Source=Mikasasa-lap\Mikasasa;Database=Ambermoda;Integrated Security=True;Pooling=False;"/>

Answer 1

According to source code you provided, you’re working with the Code First approach.
CF assumes that class should have property named “Id” by the naming convention, and this property will be treated as primary key.

Otherwise, you should manually declare primary key via attribute [Key] or using fluent API (see EntityTypeConfiguration.HasKey method).