EF returns old values

Question

I\'m using EF6 + WPF with MVVM design pattern in my desktop application. I\'m using also Autofac as DI container.

I read a lot about EF context lifetime management

Answer 1

If you use MVVM then you can do: your view bind to your view model with property type EntityViewModel (is a wrapper for the Entity). All changes immediately appear in the EntityViewModel. If you want to undo changes - invoke method EntityViewModel.Undo(). If you want to apply the changes to the entity - invoke EntityViewModel.Apply(). Then you can invoke method DbContext.SaveChanges().

public class Entity 
{
    public string Id { get; set; }
    public string State { get; set; }
}

public class EntityViewModel : ViewModelBase
{
    private string _state;

    public EntityViewModel(Entity entity)
    {
        Entity = entity;
        _state = entity.State;
    }

    public string State
    {
        get { return _state; }
        set
        {
            if (value == _state)
                return;
            _state = value;
            base.OnPropertyChanged("State");
        }
    }

    public Entity Entity {get; private set; }

    public void ApplyChanges()
    {
        Entity.State = _state;
    }

    public void Undo()
    {
        State = entity.State;
    }
}

This is a good division of responsibilities, which fits into the MVVM.