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[英]Autofac - Retrieving new instance of UnitOfWork - “DBcontext has been disposed error”
[英]Autofac DbContext has been disposed
我已經閱讀了這篇文章DbContext 已被處置和 autofac但我仍然遇到同樣的錯誤:
操作無法完成,因為 DbContext 已被釋放。
public class EFRepository : IRepository
{
private EFDbContext context;
public EFRepository(EFDbContext ctx)
{
context = ctx;
}
public TEntity FirstOrDefault<TEntity>(Expression<Func<TEntity, bool>> predicate, params Expression<Func<TEntity, object>>[] includes)
where TEntity : class, IContextEntity
{
IQueryable<TEntity> query = includes.Aggregate<Expression<Func<TEntity, object>>, IQueryable<TEntity>>
(context.Set<TEntity>(), (current, expression) => current.Include(expression));
return query.FirstOrDefault(predicate);
}
}
在 Global.asax
ContainerBuilder builder = new ContainerBuilder();
builder.RegisterControllers(typeof(MvcApplication).Assembly);
builder.Register<IRepository>(c => new EFRepository(new EFDbContext()));
ILifetimeScope container = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
Controller 注入:
public class AccountController : Controller
{
private readonly IRepository repository;
private readonly IMembershipService membershipService;
public AccountController(IRepository repo, IMembershipService mmbrSvc)
{
repository = repo;
membershipService = mmbrSvc;
}
[HttpPost]
public ActionResult Login(LoginViewModel viewModel)
{
if (!ModelState.IsValid)
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
string returnUrl = (string)TempData["ReturnUrl"];
LoginDto accountDto = viewModel.GetLoginStatus(repository, membershipService, returnUrl);
string accountDtoJson = JsonHelper.Serialize(accountDto);
return Content(accountDtoJson, "application/json");
}
}
然后在 LoginViewModel 中:
public LoginDto GetLoginStatus(IRepository repo, IMembershipService mmbrSvc, string returnUrl)
{
repository = repo;
membershipService = mmbrSvc;
User user = repository.FirstOrDefault<User>(x => x.Username == Username, x => x.Membership);
............
............
}
您需要在AutoFac中注冊DbContext
本身,並為其賦予適當的生命周期。 InstancePerDependency
通常適用於存儲庫。
builder.RegisterType<EFDbContext>().AsSelf().InstancePerDependency();
然后,您不需要給存儲庫注冊一個對象,只需注冊類型(記住還要指定生存期):
builder.Register<EFRepository>().As<IRepository>().InstancePerLifetimeScope();
使用builder.RegisterType<EFDbContext>().AsSelf().SingleInstance();
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