如何在存储库中实现IDisposable继承？

我正在创建一个通用存储库,不知道实现dispose功能的正确方法是什么:

我没有使用IoC/DI,但我将来会重构我的代码,所以:

我的代码:

IUnitOfWork接口:

namespace MyApplication.Data.Interfaces
{
    public interface IUnitOfWork
   {
       void Save();
   }
}

DatabaseContext类:

namespace MyApplication.Data.Infra
{
    public class DatabaseContext : DbContext, IUnitOfWork
    {
        public DatabaseContext(): base("SQLDatabaseConnectionString")
        {
            Database.SetInitializer(null);
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // Same code.
            base.OnModelCreating(modelBuilder);
        }

        #region Entities mapping
        public DbSet User { get; set; }
        // >>> A lot of tables
        #endregion

        public void Save()
        {
            base.SaveChanges();
        }
    }
}

IGenericRepository接口:

namespace MyApplication.Data.Interfaces
{
    public interface IGenericRepository where T : class
    {
        IQueryable GetAll();

        IQueryable Get(Expression> predicate);

        T Find(params object[] keys);

        T GetFirstOrDefault(Expression> predicate);

        bool Any(Expression> predicate);

        void Insert(T entity);

        void Edit(T entity);

        void Delete(Expression> predicate);
    }
}

GenericRepository类:

namespace MyApplication.Data.Repositories
{
    public class GenericRepository : IDisposable, IGenericRepository where T  : class
    {
        private DatabaseContext _context;
        private DbSet _entity;

        public GenericRepository(IUnitOfWork unitOfWork)
        {
            if (unitOfWork == null)
                throw new ArgumentNullException("unitofwork");

            _context = unitOfWork as DatabaseContext;
            _entity = _context.Set();
        }

        public IQueryable GetAll()
        {
            return _entity;
        }

        public IQueryable Get(Expression> predicate)
        {
            return _entity.Where(predicate).AsQueryable();
        }

        // I delete some of the code to reduce the file size.

        #region Dispose
        public void Dispose()
        {
            // HERE IS MY FIRST DOUBT: MY METHOD ITS OK?!
            // I saw implementations with GC.Suppress... and dispose in destructor, etc.

            _context.Dispose();
        }
       #endregion
    }
}

IUserRepository接口:

namespace MyApplication.Data.Interfaces
{
    public interface IUserRepository : IGenericRepository { }
}

UserRepository类:

namespace MyApplication.Data.Repositories
{
    public class UserRepository : GenericRepository, IUserRepository, IDisposable
    {
        public UserRepository(IUnitOfWork unitOfWork) : base(unitOfWork) {}
    }
}

UserController控制器类:

namespace MyApplication.Presentation.MVCWeb.Controllers
{
    [Authorize]
    public class UserController : Controller
    {
        private IUserRepository _userRepository;
        private IProfileRepository _profileRepository;
        private IUnitOfWork _unitOfWork;

        public UserController()
        {
            this._unitOfWork = new DatabaseContext();
            this._userRepository = new UserRepository(_unitOfWork);
            this._profileRepository = new ProfileRepository(_unitOfWork);
        }

        public ActionResult List()
        {
            return View(this._userRepository.GetAll().ToList());
        }

        public ActionResult Create()
        {
            ViewBag.Profiles = new SelectList(this._profileRepository.GetAll().ToList(), "Id", "Name");

            return View(new User());
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Exclude = "Id, Status, CompanyId")] User model)
        {
            ViewBag.Profiles = new SelectList(this._profileRepository.GetAll().ToList(), "Id", "Name");

            if (ModelState.IsValid)
            {
                model.EmpresaId = 1;
                model.Status = Status.Active;

                _userRepository.Insert(model);
                _unitOfWork.Save();

                return RedirectToAction("List");
            }
            else
            {
                return View();
            }
        }
    }

那么,我何时以及如何处置我的控制器和/或我的存储库和上下文？