How to get DbContext Instance within UnitOfWork via Ninject? - entity-framework

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 ?

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;
}
}
[...]

Related

UnitOfWork with Unity DI Not Persisting Context Changes

I am trying to set up UoW with Unity DI using .NET Framework, and everything works until I call the context.SaveChanges(), the ChangeTracker.HasChanges() in the context passed to the UoW shows false, so context changes are not persisting through to the UoW implementation. I have a feeling this is due to my registration of the UoW in the Unity container, as this is my first time setting this up. Does anything stand out as incorrect?
EDIT - I went around the UoW functionality and attempted to just call _context.SaveChanges() directly on my context and it still does not save. So it seems it's something beyond the UoW.
UnityConfig
public static class UnityConfig
{
public static void RegisterComponents()
{
var container = new UnityContainer();
container.RegisterType<AccountController>(new InjectionConstructor());
container.RegisterType<IChildFamilyCareProviderLinkRepository, ChildFamilyCareProviderLinkRepository>();
container.RegisterType<IFamilyCareProviderRepository, FamilyCareProviderRepository>();
container.RegisterType<IFamilyCareProviderContactRepository, FamilyCareProviderContactRepository>();
container.RegisterType<IUnitOfWork, UnitOfWork>();
container.RegisterInstance(AutoMapperConfig.Mapper);
DependencyResolver.SetResolver(new UnityDependencyResolver(container));
}
}
UnitOfWork
public class UnitOfWork : IUnitOfWork
{
private readonly RAINContext _context;
public IFamilyCareProviderRepository FamilyCareProviders { get; private set; }
public IFamilyCareProviderContactRepository FamilyCareProviderContacts { get; private set; }
public IChildFamilyCareProviderLinkRepository ChildFamilyCareProviderLinks { get; private set; }
public UnitOfWork(RAINContext context,
IFamilyCareProviderRepository familyCareProviderRepository,
IFamilyCareProviderContactRepository familyCareProviderContactRepository,
IChildFamilyCareProviderLinkRepository childFamilyCareProviderLinkRepository)
{
this._context = context;
this.FamilyCareProviders = familyCareProviderRepository;
this.FamilyCareProviderContacts = familyCareProviderContactRepository;
this.ChildFamilyCareProviderLinks = childFamilyCareProviderLinkRepository;
}
public bool Save()
{
_context.ChangeTracker.HasChanges(); //THIS SHOWS FALSE
var success = _context.SaveChanges(); //No changes are saved to DB
return success > 0;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool dispose)
{
if (dispose)
{
_context.Dispose();
}
}
}
IUnitOfWork
public interface IUnitOfWork : IDisposable
{
IFamilyCareProviderRepository FamilyCareProviders { get; }
IFamilyCareProviderContactRepository FamilyCareProviderContacts { get; }
IChildFamilyCareProviderLinkRepository ChildFamilyCareProviderLinks { get; }
bool Save();
}
Controller
public class FamilyCareProviderController : Controller
{
private readonly IUnitOfWork _unitOfWork;
private readonly IMapper _mapper;
public FamilyCareProviderController(
IUnitOfWork unitOfWork)
{
this._unitOfWork = unitOfWork;
this._mapper = AutoMapperConfig.Mapper;
}
[HttpPost]
public ActionResult CreateFamilyCareProvider(CreateFamilyCareProvider vm)
{
try
{
var fcp = new FamilyCareProvider()
{
Id = Guid.NewGuid().ToString().ToUpper(),
FamilyCareProviderName = vm.FamilyCareProviderName,
IsActive = true,
CreatedById = UserId,
LastUpdatedById = UserId
};
_unitOfWork.FamilyCareProviders.Insert(fcp);
var fcpc = _mapper.Map<FamilyCareProviderContact>(vm.FamilyCareProviderContact);
_unitOfWork.FamilyCareProviderContacts.Insert(fcpc);
var result = _unitOfWork.Save();
return RedirectToAction(nameof(Index));
}
catch (Exception)
{
ModelState.AddModelError("", "Error saving family care provider contact.");
return View(vm);
}
}
}
Is there something that is obvious that stands out in the implementation of this?

Entity framework with dapper in repository

We are using entity framework with repository/unit of work pattern. Now, we would like to use dapper along with EF. Below are few basic classes we are using:
public interface IRepository<TEntity> where TEntity : class
{
void Add(TEntity entity);
void Update(TEntity entity);
void Delete(int id);
TEntity GetById(int id);
IEnumerable<TEntity> GetAll();
}
public class Repository<TEntity> : IRepository<TEntity> where TEntity : class
{
protected readonly DbContext _context;
protected readonly DbSet<TEntity> _entities;
public Repository(DbContext context)
{
_context = context;
_entities = context.Set<TEntity>();
}
public virtual void Add(TEntity entity)
{
_entities.Add(entity);
}
public virtual void Update(TEntity entity)
{
_entities.Update(entity);
}
public virtual void Delete(int id)
{
var entity = GetById(id);
_entities.Remove(entity);
}
public virtual TEntity GetById(int id)
{
return _entities.Find(id);
}
public virtual IEnumerable<TEntity> GetAll()
{
return _entities.ToList();
}
}
public interface IUnitOfWork
{
IEmployeeRepository Employees { get; }
ICityRepository Cities { get; }
int SaveChanges();
}
public class UnitOfWork : IUnitOfWork
{
readonly AppDbContext _context;
IEmployeeRepository _employees;
ICityRepository _cities;
public UnitOfWork(AppDbContext context)
{
_context = context;
}
public IEmployeeRepository Employees
{
get
{
if (_employees == null)
_employees = new EmployeeRepository(_context);
return _employees;
}
}
public ICityRepository Cities
{
get
{
if (_cities == null)
_cities = new CityRepository(_context);
return _cities;
}
}
public int SaveChanges()
{
return _context.SaveChanges();
}
}
public interface IEmployeeRepository : IRepository<Employee>
{
bool CheckEmployeeExists(int employeeId, string employeeName);
}
public class EmployeeRepository : Repository<Employee>, IEmployeeRepository
{
public EmployeeRepository(DbContext context) : base(context)
{ }
public bool CheckEmployeeExists(int employeeId, string employeeName)
{
// Implement Dapper code here
}
private AppDbContext _appContext => (AppDbContext)_context;
}
Now, we would like to implement few methods of EmployeeRepository like CheckEmployeeExists to use Dapper. What changes do we need to make in above code considering best coding practices so that both EF and dapper work in proper way. How to integrate Dapper here?
Thank you.
This is for EF Core (EF6 works the same but the methods are slightly different).
Either open/close the underlying DbConnection in each method:
public bool CheckEmployeeExists(int employeeId, string employeeName)
{
var con = context.GetDbConnection();
con.Open();
//use Dapper with DbConnection here
con.Close();
}
If you fail to Close() the connection, it will be closed by DbContext.Dispose(), so it's not critical to Close() and you must not call Dispose() here.
Or Open the connection in the constructor, then it will be available to any method for the lifetime of the DbContext, eg
public EmployeeRepository(DbContext context) : base(context)
{
this.con = context.GetDbConnection();
con.Open();
}

how do I change my unit of work to allow multiple dbcontexts?

How do I update this code below to allow for multiple DbContexts? I searched other posts and I tried to make my unit of work and dbfactory classes accept a generic type but I had trouble with the RepositoryBase class, the repository, the service and tying it all together; I still struggle with generics in C#. Can anyone help me out?
DbFactory.cs
public class DbFactory : Disposable, IDbFactory
{
WilMpeContext _dbContext;
public WilMpeContext Init()
{
return _dbContext ?? (_dbContext = new WilMpeContext());
}
protected override void DisposeCore()
{
_dbContext?.Dispose();
}
}
Disposable.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;
}
// Ovveride this to dispose custom objects
protected virtual void DisposeCore()
{
}
}
iDbFactory.cs
public interface IDbFactory : IDisposable
{
WilMpeContext Init();
}
IRepository.cs
public interface IRepository<T> where T : class
{
// Marks an entity as new
void Add(T entity);
// Marks an entity as modified
void Update(T entity);
// Marks an entity to be removed
void Delete(T entity);
void Delete(Expression<Func<T, bool>> where);
// Get an entity by int id
T GetById(int id);
// Get an entity using delegate
T Get(Expression<Func<T, bool>> where);
// Gets all entities of type T
IEnumerable<T> GetAll();
// Gets entities using delegate
IEnumerable<T> GetMany(Expression<Func<T, bool>> where);
}
IUnitOfWork.cs
public interface IUnitOfWork
{
void Commit();
}
RepositoryBase.cs
public abstract class RepositoryBase<T> where T : class
{
#region Properties
private WilMpeContext _dataContext;
private readonly IDbSet<T> _dbSet;
protected IDbFactory DbFactory
{
get;
private set;
}
protected WilMpeContext DbContext
{
get { return _dataContext ?? (_dataContext = DbFactory.Init()); }
}
#endregion
protected RepositoryBase(IDbFactory dbFactory)
{
DbFactory = dbFactory;
_dbSet = DbContext.Set<T>();
}
#region Implementation
public virtual void Add(T entity)
{
_dbSet.Add(entity);
}
public virtual void Update(T entity)
{
_dbSet.Attach(entity);
_dataContext.Entry(entity).State = EntityState.Modified;
}
public virtual void Delete(T entity)
{
_dbSet.Remove(entity);
}
public virtual void Delete(Expression<Func<T, bool>> where)
{
IEnumerable<T> objects = _dbSet.Where<T>(where).AsEnumerable();
foreach (T obj in objects)
_dbSet.Remove(obj);
}
public virtual T GetById(int id)
{
return _dbSet.Find(id);
}
public virtual IEnumerable<T> GetAll()
{
return _dbSet.ToList();
}
public virtual IEnumerable<T> GetMany(Expression<Func<T, bool>> where)
{
return _dbSet.Where(where).ToList();
}
public T Get(Expression<Func<T, bool>> where)
{
return _dbSet.Where(where).FirstOrDefault<T>();
}
#endregion
}
UnitOfWork.cs
public class UnitOfWork : IUnitOfWork
{
private readonly IDbFactory _dbFactory;
private WilMpeContext _dbContext;
public UnitOfWork(IDbFactory dbFactory)
{
this._dbFactory = dbFactory;
}
public WilMpeContext DbContext
{
get { return _dbContext ?? (_dbContext = _dbFactory.Init()); }
}
public void Commit()
{
DbContext.Commit();
}
}
WilMpeContext.cs - this is one of my DbContexts but now I need another and I'm not sure how to implement that with my existing design
public class WilMpeContext : IdentityDbContext<ApplicationUser>
{
public WilMpeContext()
: base("name=DefaultConnection", throwIfV1Schema: false) { }
public IDbSet<AppSetting> AppSettings { get; set; }
//the rest of the tables were removed for brevity
public virtual void Commit()
{
base.SaveChanges();
}
public static WilMpeContext Create()
{
return new WilMpeContext();
}
protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
}
}
Here is how I setup the repository to use the unit of work. AppSetting is a table in my model:
public interface IAppSettingRepository : IRepository<AppSetting>
{
void UpdateAppSetting(AppSetting appSetting);
}
public class AppSettingRepository : RepositoryBase<AppSetting>,IAppSettingRepository
{
public AppSettingRepository(IDbFactory dbFactory)
: base(dbFactory) { }
//an example of how I do something in the database. See I use DbContext from RepositoryBase
public void UpdateAppSetting(AppSetting appSetting)
{
DbContext.Entry(appSetting).State = EntityState.Modified;
}
}
And this is my service:
public class AppSettingService : IAppSettingService
{
private readonly IAppSettingRepository _appSettingRepository;
private readonly IUnitOfWork _unitOfWork;
public AppSettingService(IAppSettingRepository appSettingRepository,
IUnitOfWork unitOfWork)
{
_appSettingRepository = appSettingRepository;
_unitOfWork = unitOfWork;
}
//call repository to do database stuff and then commit changes
public void UpdateAppSetting(AppSetting appSetting)
{
_appSettingRepository.UpdateAppSetting(appSetting);
_unitOfWork.Commit();
}
}
You need to make all your interfaces and classes that is using your current WilMpeContext to generic. Also you would need to put a generic constraint on new generic.
First make your Interfaces generic for Unit of work and DBFactory:
public interface IUnitOfWork<TContext> where TContext: DbContext, new()
{
void Commit();
}
public interface IDbFactory<TContext> : IDisposable where TContext: DbContext, new()
{
TContext Init();
}
Now let's update your Classes for UnitOfWork and DBFactory:
public class UnitOfWork<TContext> : IUnitOfWork<TContext> where TContext: DbContext, new()
{
private readonly IDbFactory<TContext> _dbFactory;
private TContext _dbContext;
public UnitOfWork(IDbFactory<TContext> dbFactory)
{
this._dbFactory = dbFactory;
}
public TContext DbContext
{
get { return _dbContext ?? (_dbContext = _dbFactory.Init()); }
}
public void Commit()
{
this.DbContext.SaveChanges();
}
}
public class DbFactory<TContext> : Disposable, IDbFactory<TContext> where TContext: DbContext, new()
{
TContext _dbContext;
public TContext Init()
{
return _dbContext ?? (_dbContext = new TContext());
}
protected override void DisposeCore()
{
_dbContext?.Dispose();
}
}
Add an additional generic on Repository base class:
public abstract class RepositoryBase<T, TContext> where T : class where TContext: DbContext, new()
{
#region Properties
private TContext _dataContext;
private readonly IDbSet<T> _dbSet;
protected IDbFactory<TContext> DbFactory
{
get;
private set;
}
protected TContext DbContext
{
get { return _dataContext ?? (_dataContext = this.DbFactory.Init()); }
}
#endregion
protected RepositoryBase(IDbFactory<TContext> dbFactory)
{
DbFactory = dbFactory;
_dbSet = DbContext.Set<T>();
}
#region Implementation
public virtual void Add(T entity)
{
_dbSet.Add(entity);
}
public virtual void Update(T entity)
{
_dbSet.Attach(entity);
_dataContext.Entry(entity).State = System.Data.Entity.EntityState.Modified;
}
public virtual void Delete(T entity)
{
_dbSet.Remove(entity);
}
public virtual void Delete(Expression<Func<T, bool>> where)
{
IEnumerable<T> objects = _dbSet.Where<T>(where).AsEnumerable();
foreach (T obj in objects)
_dbSet.Remove(obj);
}
public virtual T GetById(int id)
{
return _dbSet.Find(id);
}
public virtual IEnumerable<T> GetAll()
{
return _dbSet.ToList();
}
public virtual IEnumerable<T> GetMany(Expression<Func<T, bool>> where)
{
return _dbSet.Where(where).ToList();
}
public T Get(Expression<Func<T, bool>> where)
{
return _dbSet.Where(where).FirstOrDefault<T>();
}
#endregion
}
Here is your repository that will be typed with your Actual Context WilMpeContext class.
public class AppSettingRepository : RepositoryBase<AppSetting, WilMpeContext>, IAppSettingRepository
{
public AppSettingRepository(IDbFactory<WilMpeContext> dbFactory)
: base(dbFactory) { }
//an example of how I do something in the database. See I use DbContext from RepositoryBase
public void UpdateAppSetting(AppSetting appSetting)
{
DbContext.Entry(appSetting).State = System.Data.Entity.EntityState.Modified;
}
}
Finally your AppsettingService
public class AppSettingService : IAppSettingService
{
private readonly IAppSettingRepository _appSettingRepository;
private readonly IUnitOfWork<WilMpeContext> _unitOfWork;
public AppSettingService(IAppSettingRepository appSettingRepository,
IUnitOfWork<WilMpeContext> unitOfWork)
{
_appSettingRepository = appSettingRepository;
_unitOfWork = unitOfWork;
}
//call repository to do database stuff and then commit changes
public void UpdateAppSetting(AppSetting appSetting)
{
_appSettingRepository.UpdateAppSetting(appSetting);
_unitOfWork.Commit();
}
}
Now your UnitOfWork infrastructure will support any DbContext for all repositories.
Udpate
Alternative solution(May be)
May be I'm wrong but why would you need multiple dbcontext if your dbContext is not shared across the applications. I'm sure you are using Asp.net 5 MVC project that generates it's own IdenityDbContext and you might have your other DBContext as well. You can merge these two context and this way you can keep your current implementation of UOW.
Check out these SO QnA if this is the actual problem.
ASP.NET Identity DbContext confusion
Merge MyDbContext with IdentityDbContext

Unable to inject DBContext into my Web API 2 Controller with Unity

I've been at it for days, but I can't get Unity to inject anything with RegisterType<> into my Controller. I'm using Web Api 2, in Visual Studio 2015, with Unity 4. Whenever I try to inject IUnitOfWork or IRFContext, I get "message": "An error occurred when trying to create a controller of type 'ClPlayersController'. Make sure that the controller has a parameterless public constructor.".
I'm using the Unity.AspNet.WebApi to bootstrapp into WebApi. Below is my UnityWebApiActivator
[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(mycompany.project.api.UnityWebApiActivator), "Start")]
[assembly: WebActivatorEx.ApplicationShutdownMethod(typeof(mycompany.project.api.UnityWebApiActivator), "Shutdown")]
namespace mycompany.project.api
{
public static class UnityWebApiActivator
{
public static void Start()
{
var resolver = new UnityDependencyResolver(UnityConfig.GetConfiguredContainer());
GlobalConfiguration.Configuration.DependencyResolver = resolver;
}
public static void Shutdown()
{
var container = UnityConfig.GetConfiguredContainer();
container.Dispose();
}
}
}
I'm using a Start.cs due to Owin.
[assembly: OwinStartup(typeof(mycompany.project.api.Startup))]
namespace mycompany.project.api
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
HttpConfiguration config = new HttpConfiguration();
ConfigureOAuth(app);
config.DependencyResolver = new UnityDependencyResolver(UnityConfig.GetConfiguredContainer());
WebApiConfig.Register(config);
app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
app.UseWebApi(config);
}
public void ConfigureOAuth(IAppBuilder app)
{
OAuthAuthorizationServerOptions OAuthServerOptions = new OAuthAuthorizationServerOptions()
{
AllowInsecureHttp = true,
TokenEndpointPath = new PathString("/token"),
AccessTokenExpireTimeSpan = TimeSpan.FromDays(1),
Provider = new SimpleAuthorizationServerProvider(),
RefreshTokenProvider = new SimpleRefreshTokenProvider()
};
// Token Generation
app.UseOAuthAuthorizationServer(OAuthServerOptions);
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
}
}
}
My WebApiConfig.cs is below:
namespace mycompany.project.api
{
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
log4net.Config.XmlConfigurator.Configure();
config.MapHttpAttributeRoutes();
config.EnableSystemDiagnosticsTracing();
config.Services.Add(typeof(IExceptionLogger),
new SimpleExceptionLogger(new LogManagerAdapter()));
config.Services.Replace(typeof(IExceptionHandler), new GlobalExceptionHandler());
}
}
}
My UnityConfig.cs is below
namespace mycompany.project.api
{
public class UnityConfig
{
#region Unity Container
private static Lazy<IUnityContainer> container = new Lazy<IUnityContainer>(() =>
{
var container = new UnityContainer();
RegisterTypes(container);
return container;
});
public static IUnityContainer GetConfiguredContainer()
{
return container.Value;
}
#endregion
public static void RegisterTypes(IUnityContainer container)
{
var config = new MapperConfiguration(cfg =>
{
//AutoMapper bindings
});
container.RegisterInstance<IMapper>(config.CreateMapper());
container.RegisterType<IRFContext, RFContext>(new PerThreadLifetimeManager());
container.RegisterType<IUnitOfWork, UnitOfWork>();
XmlConfigurator.Configure();
var logManager = new LogManagerAdapter();
container.RegisterInstance<ILogManager>(logManager);
}
}
}
All that I have in my Global.asax is below:
public class WebApiApplication : System.Web.HttpApplication
{
protected void Application_Error()
{
var exception = Server.GetLastError();
if (exception != null)
{
var log = new LogManagerAdapter().GetLog(typeof(WebApiApplication));
log.Error("Unhandled exception.", exception);
}
}
}
If my Controller is like this, it works fine:
public class ClPlayersController : ApiController
{
private readonly IMapper mapper;
public ClPlayersController(IMapper _mapper, IUnityContainer container)
{
mapper = _mapper;
}
But placing IUnitOfWork, like below, or the IRFContext, I get the error:
private readonly IMapper mapper;
private readonly IUnitOfWork unitOfWork;
public ClPlayersController(IMapper _mapper, IUnityContainer container, IUnitOfWork _unitOfWork)
{
mapper = _mapper;
unitOfWork = _unitOfWork;
}
I can't find, for the life of me, what I'm doing wrong. If I loop through the container.Registrations on the constructor, I find the mappings, but they refuse to get injected. Any hints?
EDIT
Below is the code for UnitOfWork and RFContext
namespace mycompany.project.data.configuracao
{
public class UnitOfWork : IUnitOfWork
{
private readonly IRFContext _rfContext;
private bool _disposed = false;
public UnitOfWork(IRFContext rfContext)
{
_rfContext = rfContext;
}
public void Commit()
{
if (_disposed)
{
throw new ObjectDisposedException(this.GetType().FullName);
}
_rfContext.SaveChanges();
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (_disposed) return;
if (disposing && _rfContext != null)
{
_rfContext.Dispose();
}
_disposed = true;
}
}
}
and
namespace mycompany.project.data.configuracao
{
public interface IUnitOfWork : IDisposable
{
void Commit();
}
}
and RFContext is a basic POCO generated DBContext
namespace mycompany.project.data.configuracao
{
using System.Linq;
public class RFContext : System.Data.Entity.DbContext, IRFContext
{
public System.Data.Entity.DbSet<ClGrupoEconomico> ClGrupoEconomicoes { get; set; }
//all my DbSets
public System.Data.Entity.DbSet<SpTipoLog> SpTipoLogs { get; set; }
static RFContext()
{
System.Data.Entity.Database.SetInitializer<RFContext>(null);
}
public RFContext()
: base("Name=RFContext")
{
}
public RFContext(string connectionString)
: base(connectionString)
{
}
public RFContext(string connectionString, System.Data.Entity.Infrastructure.DbCompiledModel model)
: base(connectionString, model)
{
}
public RFContext(System.Data.Common.DbConnection existingConnection, bool contextOwnsConnection)
: base(existingConnection, contextOwnsConnection)
{
}
public RFContext(System.Data.Common.DbConnection existingConnection, System.Data.Entity.Infrastructure.DbCompiledModel model, bool contextOwnsConnection)
: base(existingConnection, model, contextOwnsConnection)
{
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
}
protected override void OnModelCreating(System.Data.Entity.DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Configurations.Add(new ClGrupoEconomicoConfiguration());
//all my Configuration classes
modelBuilder.Configurations.Add(new SpTipoLogConfiguration());
}
public static System.Data.Entity.DbModelBuilder CreateModel(System.Data.Entity.DbModelBuilder modelBuilder, string schema)
{
modelBuilder.Configurations.Add(new ClGrupoEconomicoConfiguration(schema));
//all my configuration classes
modelBuilder.Configurations.Add(new SpTipoLogConfiguration(schema));
return modelBuilder;
}
}
}
Unfortunately the exception you are seeing can occur for several reasons. One of them is when Unity cannot resolve one or more of your injections.
An error occurred when trying to create a controller of type
'FooController'. Make sure that the controller has a parameterless
public constructor.
So, based on the information in your question your setup is apparently correct, since IMapper can be injected. Therefore I guess that UnitOfWork and RFContext have dependencies that Unity cannot resolve. Maybe a repository?
UPDATE:
The problem here is that your RFContext has several constructors.
https://msdn.microsoft.com/en-us/library/cc440940.aspx#cnstrctinj_multiple
When a target class contains more than one constructor with the same
number of parameters, you must apply the InjectionConstructor
attribute to the constructor that the Unity container will use to
indicate which constructor the container should use. As with automatic
constructor injection, you can specify the constructor parameters as a
concrete type, or you can specify an interface or base class for which
the Unity container contains a registered mapping.
In this case Unity doesn't know how to resolve your RFContext, and will try to use the constructor with the most parameters. You can solve it by using
container.RegisterType<IRFContext, RFContext>(new InjectionConstructor());

Entity Framework using Repository Pattern, Unit of Work and Unity

Using a combination provided from this example and this implementation I am trying to create a solution that decouples the UnitOfWork class from the individual repositories, as they violate the Open-Closed Principle, since every time you added a new repository you would have to modify the UnitOfWork class. I am using Unity as the IoC container to wire up dependencies.
The problem I have is that in automatically wiring up the UnitOfWork, IDbContext and the repositories (IEmployeeRepository and ICustomerRepository) using Unity, the repositories will be injected with separate instances of the UnitOfWork, which, of course, defeats the purpose. I need to share the context across the repositories, and it seems I am missing a piece to this puzzle - at the moment (see Service layer) the UnitOfWork instantiated will be different to the UnitOfWork for each of repositories.
How do inject the IUnitOfWork into the service layer and pass this instantiated shared UnitOfWork class to the respective repositories, using Unity and dependency injection?
Here's my proposed (fabricated) solution:
Repositories
public interface IRepository<TEntity> where TEntity : class
{
TEntity Create();
// omitted for brevity
}
public class Repository<TEntity> : IRepository<TEntity>
where TEntity : class
{
private readonly DbContext _context;
public Repository(IUnitOfWork uow)
{
_context = uow.Context;
}
public virtual TEntity Create(TEntity entity)
{
return _context.Set<TEntity>().Add(entity);
}
// omitted for brevity
}
public interface IEmployeeRepository : IRepository<Employee>
{
}
public interface ICustomerRepository : IRepository<Customer>
{
}
public class EmployeeRepository : Repository<Employee>
{
public EmployeeRepository(IUnitOfWork uow)
: base(uow)
{
}
}
public class CustomerRepository : Repository<Customer>
{
public CustomerRepository(IUnitOfWork uow)
: base(uow)
{
}
}
DbContext Factory
public interface IDbContextFactory
{
DbContext GetContext();
}
public class DbContextFactory : IDbContextFactory
{
private readonly DbContext _context;
public DbContextFactory()
{
_context = new MyDbContext("ConnectionStringName");
}
public DbContext GetContext()
{
return _context;
}
}
Unit Of Work
public interface IUnitOfWork
{
void SaveChanges();
DbContext Context { get; }
}
public class UnitOfWork : IUnitOfWork, IDisposable
{
private readonly DbContext _context;
private bool disposed = false;
public UnitOfWork(IDbContextFactory contextFactory)
{
_context = contextFactory.GetContext();
}
public void SaveChanges()
{
if (_context != null)
{
_context.SaveChanges();
}
}
public DbContext Context
{
get { return _context; }
}
protected virtual void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
_context.Dispose();
}
}
disposed = true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}
Service
public class CompanyService
{
private readonly IUnitOfWork _uow;
private readonly IEmployeeRepository _employeeRepository;
private readonly ICustomerRepository _customerRepository;
public CompanyService(IUnitOfWork uow, IEmployeeRepository employeeRepository, ICustomerRepository customerRepository)
{
_uow = uow;
_employeeRepository = employeeRepository;
_customerRepository = customerRepository;
}
// over-simplified example method
public void AddEmployeeAndCustomer()
{
_employeeRepository.Create(new Employee {Id = 1, Name = "Test Employee"});
_customerRepository.Create(new Customer { Id = 2, Name = "Test Customer" });
_uow.SaveChanges();
}
}
I think what you are looking for is a per request lifetime manager so that you only get one UnitOfWork instance and one DbContext instance for the duration of a request. Unity 3 has the Unity bootstrapper for ASP.NET MVC which has a PerRequestLifetimeManager which lets you do this.
If you are not using ASP.NET then you could probably use a PerResolveLifetimeManager. Another approach I've seen is a HierarchicalLifetimeManager combined with a child container (which makes the registrations a singleton within the child container).