How to get DbContext Instance within UnitOfWork via Ninject?

Question

I Use UnitOfWork Pattern with Entity Framework to expose DbContext using bellow code. So My question is that, is it poosible to get Context instance with Ninject ?

IUnitOfWork

public interface IUnitOfWork<C> :  IDisposable
{
        int Commit();
        C GetContext { get; set; }
}

UnitOfWork

public class UnitOfWork<C> : IUnitOfWork<C> where C : DbContext
    {
        private bool _disposed;
        private readonly C _dbContext = null;

        public UnitOfWork()
        {
            GetContext = _dbContext ?? Activator.CreateInstance<C>();
        }

        public int Commit()
        {
            return GetContext.SaveChanges();
        }


        public C GetContext
        {
            get;
            set;
        }
[...]

Now within NinjectWebCommon

private static void RegisterServices(IKernel kernel)
{
  kernel.Bind<IUnitOfWork<MyDbContext>>().To<UnitOfWork<MyDbContext>>().InRequestScope();
  kernel.Bind<IEmployeeRepository>().To<EmployeeRepository>();
}

Without using _dbContext ?? Activator.CreateInstance<C>(); , can it be possible to get DbContext instance via Ninject ?

`kernel.Bind().ToSelf().InRequestScope();` I can do that ? but what will be the code within UnitOfWork ? — Shubhajyoti Ghosh, Jan 14 '13 at 19:38
I'm not familiar with Ninject, but I would assume you could add a constructor that accepts a `C` parameter: `public UnitOfWork(C context)`. — jrummell, Jan 14 '13 at 19:42
@jrummell: Yes right you are. `private readonly C _dbcontext; public UnitOfWork(C dbcontext) { _dbcontext = dbcontext; }` — Shubhajyoti Ghosh, Jan 14 '13 at 20:02

score 3 · Accepted Answer · answered Jan 14 '13 at 20:03

Yes it is possible . check the solution bellow

Ninject DI Configuration

kernel.Bind<MyDbContext>().ToSelf().InRequestScope();
kernel.Bind<IUnitOfWork<MyDbContext>>().To<UnitOfWork<MyDbContext>>();
kernel.Bind<IEmployeeRepository>().To<EmployeeRepository>();

And within UnitOfWork

   public class UnitOfWork<C> : IUnitOfWork<C> where C : DbContext
    {
        private readonly C _dbcontext;

        public UnitOfWork(C dbcontext)
        {
            _dbcontext = dbcontext;
        }

        public int Commit()
        {
           return _dbcontext.SaveChanges();
        }

        public C GetContext
        {
            get
            {
                return _dbcontext;
            }

        }
[...]

How to get DbContext Instance within UnitOfWork via Ninject?

1 Answers1