// @nuget: Microsoft.SqlServer.Compact

// @nuget: Z.EntityFramework.Classic

// @nuget: Z.EntityFramework.Classic.SqlServerCompact

​

using System;

using System.Linq;

using System.Data.Entity;

​

public class Program

{

    public static void Main()

    {

        // Custom configuration specific for .NET Fiddle

        Z.EntityFramework.Classic.EntityFrameworkManager.UseFiddleSqlCompact(System.Data.Entity.SqlServerCompact.SqlCeProviderServices.Instance, System.Data.SqlServerCe.SqlCeProviderFactory.Instance);

​

        GenerateData();

​

        using (var context = new EntityContext())

        {

            var list = context.Accounts.Include(x => x.Customer).ToList();

            FiddleHelper.Dump(list);

            var account = context.Accounts.Find(1);

            account.Customer = new Customer {

                Name = "Test2"

            };

            context.SaveChanges();

            var list2 = context.Accounts.Include(x => x.Customer).ToList();

            FiddleHelper.Dump(list);

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Accounts.Add(new Account {

                    Customer = new Customer {

                        Name = "Test1"  

                    }

            });

            context.SaveChanges();  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(@"Data Source=ZZZ_Projects.sdf")

        {

        }

        public DbSet<Customer> Customers { get; set; }

        public DbSet<Account> Accounts { get; set; }

    }

    public class Customer

    {

        public int Id { get; set; }

        public string Name { get; set; }

    }

    public class Account

    {

        public int Id {get;set;}

        public int CustomerId {get;set;}

        public Customer Customer {get;set;}

    }

}