Entity Framework 4 CTP 4 / CTP 5 Patrón de Repositorio Genérico y Unidad Comprobable

Comience con usted DbContext, cree un nuevo archivo llamado Base de datos.cs:

Base de datos.cs

public class Database : DbContext
    {

        private IDbSet<Post> _posts;

        public IDbSet<Post> Posts {
            get { return _posts ?? (_posts = DbSet<Post>()); }
        }

        public virtual IDbSet<T> DbSet<T>() where T : class {
            return Set<T>();
        }
        public virtual void Commit() {
            base.SaveChanges();
        }
}

Defina una IDatabaseFactory e impleméntela con DatabaseFactory:

IDatabaseFactory.cs

public interface IDatabaseFactory : IDisposable
    {
        Database Get();
    }

DatabaseFactory.cs

public class DatabaseFactory : Disposable, IDatabaseFactory {
        private Database _database;
        public Database Get() {
            return _database ?? (_database = new Database());
        }
        protected override void DisposeCore() {
            if (_database != null)
                _database.Dispose();
        }
    }

Método de extensión desechable:

Desechable.cs

public class Disposable : IDisposable
    {
        private bool isDisposed;

        ~Disposable()
        {
            Dispose(false);
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        private void Dispose(bool disposing)
        {
            if(!isDisposed && disposing)
            {
                DisposeCore();
            }

            isDisposed = true;
        }

        protected virtual void DisposeCore()
        {
        }
    }

Ahora podemos definir nuestro IRepository y nuestro RepositoryBase

IRepository.cs

public interface IRepository<T> where T : class
{
    void Add(T entity);
    void Delete(T entity);
    void Update(T entity);
    T GetById(long Id);
    IEnumerable<T> All();
    IEnumerable<T> AllReadOnly();
}

Base de repositorios.cs

public abstract class RepositoryBase<T> where T : class
    {
        private Database _database;
        private readonly IDbSet<T> _dbset;
        protected RepositoryBase(IDatabaseFactory databaseFactory)
        {
            DatabaseFactory = databaseFactory;
            _dbset = Database.Set<T>();
        }

        protected IDatabaseFactory DatabaseFactory
        {
            get; private set;
        }

        protected Database Database
        {
            get { return _database ?? (_database = DatabaseFactory.Get()); }
        }
        public virtual void Add(T entity)
        {
            _dbset.Add(entity);
        }

        public virtual void Delete(T entity)
        {
            _dbset.Remove(entity);
        }

        public virtual void Update(T entity)
        {
            _database.Entry(entity).State = EntityState.Modified;
        }
        public virtual T GetById(long id)
        {
            return _dbset.Find(id);
        }

        public virtual IEnumerable<T> All()
        {
            return _dbset.ToList();
        }
        public virtual IEnumerable<T> AllReadOnly()
        {
            return _dbset.AsNoTracking().ToList();
        }
    }

Ahora puedes crear tu IPostRepository y PostRepository:

Yo postergaría.cs

     public interface IPostRepository : IRepository<Post>
        {
            //Add custom methods here if needed
            Post ByTitle(string title);
        }

Postrepositorio.cs

    public class PostRepository : RepositoryBase<Post>, IPostRepository
        {
            public PostRepository(IDatabaseFactory databaseFactory) : base(databaseFactory)
            {
            }
            public Post ByTitle(string title) {
                return base.Database.Posts.Single(x => x.Title == title);
            }
        }

Por último, el UoW:

Unidad de trabajo.cs

public interface IUnitOfWork
{
    void Commit();
}

Unidad de trabajo.cs

private readonly IDatabaseFactory _databaseFactory;
private Database _database;

public UnitOfWork(IDatabaseFactory databaseFactory)
{
    _databaseFactory = databaseFactory;
}

protected Database Database
{
    get { return _database ?? (_database = _databaseFactory.Get()); }
}

public void Commit()
{
    Database.Commit();
}

Usando en su controlador:

private readonly IPostRepository _postRepository;
private readonly IUnitOfWork_unitOfWork;

        public PostController(IPostRepository postRepository, IUnitOfWork unitOfWork)
        {
            _postRepository = postRepository;
            _unitOfWork = unitOfWork;
        }

        public ActionResult Add(Post post) {
            _postRepository.Add(post);
            _unitOfWork.Commit();
        }

Usted tendrá que utilice un contenedor IoC como StructureMap para hacer que esto funcione. Puede instalar structure map a través de NuGet, o si está utilizando MVC 3, puede instalar el paquete StructureMap-MVC NuGet. (Enlaces Abajo)

Install-Package StructureMap.MVC4

Install-Package StructureMap.MVC3

Install-Package Structuremap

Si tiene preguntas, hágamelo saber. Espero que ayude.