Update object in Entity Framework

public class SqlDataContext : DbContext
    {
        public DbSet<Message> Messages { get; set; }

        protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder)
        {

            base.OnModelCreating(modelBuilder);
        }
    }

and repository class:

 public class SqlRepository : IRepository
        {
            private SqlDataContext _dataContext;
            public SqlRepository(SqlDataContext dataContext) {
                _dataContext = dataContext;
            }

            public DbSet<Message> Messages {
                get { return _dataContext.Messages; } 
            }

            public void Commit() {
                _dataContext.SaveChanges();
            }

        }

and service class:

public class MessagesServices : IMessagesServices
    {
        #region Repository        
        private IRepository _repository;
        public UsersServices(IRepository repository) {
            _repository = repository;
        }
        #endregion


        /// <summary>
    /// Update the Message in Repository
    /// </summary>
    public void Update(Message message) {
        if (message != null) {
            _repository.Messages.Attach(message);
            _repository.Commit();
        }
    }
}

If i get any message like this:

public ViewResult Edit(int messageId)
    {
        var message = _repository.Messages.First(j => j.MessageId == messageId);
        message.Text = "Test";
        _userService.Update(message);
    }

Everything will be okay, but the changes are not saved to the database.

Message Controller constructor

private IRepository _repository;
        private IMessagesServices _messageServices;
        public MessagesController(IRepository repository, IMessagesServices messageServices)
        {
            _repository = repository;
            _messageServices = messageServices;
        }

repository, service and data context are injected by stucture map:

/// <summary>
        /// Configuration registry modules for DI
        /// </summary>
        public class WebUiRegistry : Registry
        {
            public WebUiRegistry()
            {
                For<DbContext>().Use(() => new SqlDataContext());      
                For<IRepository>().HttpContextScoped().Use<SqlRepository>();
                For<IUsersServices>().Use<UsersServices>();
                For<IMessagesServices>().Use<MessagesServices>();
                For<IJobAdvertsServices>().Use<JobAdvertsServices>();
                For<ILog>().Use<SqlLogServices>();
            }
        }

@slauma You have right.

If i try this:

ObjectFactory.GetInstance<SqlDataContext>().Messages.Attach(message);
                ObjectFactory.GetInstance<SqlDataContext>().Entry(message).State = EntityState.Modified;
                ObjectFactory.GetInstance<SqlDataContext>().SaveChanges();

Them all works fine, so i have multiple instance of SqlDataContext.

But this:

For<SqlDataContext>().Use(() => new SqlDataContext());

don't help. Any idea?

I think, problem is here

private IRepository _repository;
        private IMessagesServices _messageServices;
        public MessagesController(IRepository repository, IMessagesServices messageServices)
        {
            _repository = repository;
            _messageServices = messageServices;
        }

Because repository is here injected (inside repository is injected SqlDataContext) and in same moment is injected services (inside injected repository, in repository SqlDataContext)

public class MessageController : Controller
    {
        private IRepository _repository;
        private IMessagesServices _messagesServices;
        public MessageController(IRepository repository, IMessagesServices messagesServices)
        {
            _repository = repository;
            _messagesServices = messagesServices;

            bool sameDataContexts = object.ReferenceEquals(((SqlRepository)_repository)._dataContext, ((SqlRepository)((MessagesServices)_messagesServices)._repository)._dataContext);

        }

result is TRUE.

WORKING Solution:

private IRepository _repository;
        private IMessagesServices _messageServices;
        public MessagesController(IRepository repository)
        {
            _repository = repository;
            _messageServices = ObjectFactory.GetInstance<IUsersServices>();
        }

and in services class:

/// <summary>
    /// Update the Message in Repository
    /// </summary>
    public void Update(Message message) {
        if (message != null) {
            _repository.Messages.Attach(message);
            ObjectFactory.GetInstance<SqlDataContext>().Entry(message).State = EntityState.Modified;
            _repository.Commit();
        }

But i here any solution for two constructor parameters ? And non-using

ObjectFactory.GetInstance<SqlDataContext>().Entry(message).State = EntityState.Modified;