// @nuget: Microsoft.EntityFrameworkCore.SqlServer

​

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        var providerRecord = new ProviderRecord

        {

            ProviderRecordIdentifier = new ProviderRecordIdentifier

            {

                ProviderId = 12,

                ProviderKey = "iPhone12"

            },

            Brand = "Apple"

        };

        providerRecord.ProviderRecordIdentifier.ProviderRecordProperties.Add(new ProviderRecordProperty

                                                                             {

                                                                                 Key = "Farbe",

                                                                                 Value = "Silber"

                                                                             });

        providerRecord.ProviderRecordIdentifier.ProviderRecordProperties.Add(new ProviderRecordProperty

                                                                             {

                                                                                 Key = "Arbeitsspeicher",

                                                                                 Value = "4 GB"

                                                                             });

        using (var context = new EntityContext())

        {

            context.Add(providerRecord);

            context.SaveChanges();

            FiddleHelper.WriteTable("1 - ProviderRecordIdentifiers", context.ProviderRecordIdentifiers);

            FiddleHelper.WriteTable("2 - ProviderRecord", context.ProviderRecords);

            FiddleHelper.WriteTable("3 - ProviderRecordProperties", context.ProviderRecordProperties);

        }   

    }

​

    class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

        public DbSet<ProviderRecordIdentifier> ProviderRecordIdentifiers { get; set; }

        public DbSet<ProviderRecord> ProviderRecords { get; set; }

        public DbSet<ProviderRecordProperty> ProviderRecordProperties { get; set; }

    }

​

    public class ProviderRecordIdentifier

    {

        public ProviderRecordIdentifier()

        {

            ProviderRecordProperties = new HashSet<ProviderRecordProperty>();

        }

        public int Id { get; set; }

        public int ProviderId { get; set; }

        public string ProviderKey { get;set; }

        public ProviderRecord ProviderRecord { get; set; }

        public virtual ICollection<ProviderRecordProperty> ProviderRecordProperties { get; set; }

    }

    public class ProviderRecord

    {

        public int Id { get; set; }

        public string Brand { get; set; }

        public int ProviderRecordIdentifierId { get; set; }

        public ProviderRecordIdentifier ProviderRecordIdentifier { get; set; }

    }

    public class ProviderRecordProperty

    {

        public int Id { get; set; }

        public string Key { get; set; }

        public string Value { get; set; }

        public int ProviderRecordIdentifierId { get; set; }

        public ProviderRecordIdentifier ProviderRecordIdentifier { get; set; }

    }

}