[英]DbContext has been disposed in custom RoleProvider
在我的CustomRoleProvider
使用時,我的DbContext有問題。
我已經設置了我的綁定:
kernel.Bind<IUnitOfWork>().To<UnitOfWork>().InRequestScope();
kernel.Bind(typeof(IGenericRepository<>)).To(typeof(GenericRepository<>)).InRequestScope();
kernel.Bind<MyContext>().ToSelf().InRequestScope();
我正在使用這個NuGet包Ninject.MVC5 v3.2.1.0,所以Ninject被設置為MVC中的主要DependencyResolver。 因此,為什么我能夠執行此DependencyResolver.Current.GetService<IGenericRepository<User>>()
。
但由於某種原因,背景被處理掉了。
我嘗試將此綁定添加到我的設置中:
kernel.Bind<MyContext>().ToSelf().WhenInjectedInto<RoleProvider>();
但這也不起作用。 我也嘗試通過屬性注入注入
[Inject]
public IGenericRepository<User> UserRepository { get; set; };
但這只會導致許多我無法解決的問題(尚未)。
據我所知,從錯誤消息中可以看出是問題觸發了。
public abstract class BaseController : Controller
{
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
User.IsInRole("Admin"); // calls my CustomRoleProvider
base.OnActionExecuting(filterContext);
}
}
CustomRoleProvider
實現
public class CustomRoleProvider : RoleProvider
{
private readonly IGenericRepository<User> _userRepository;
public CustomRoleProvider()
{
// using Service Locator (anti pattern)
// cause MVC do not support DI in role providers (yet)
_userRepository = DependencyResolver.Current.GetService<IGenericRepository<User>>();
}
public override bool IsUserInRole(string username, string roleName)
{
var user = _userRepository.AsQueryable().Where(x => x.Username == username && x.Role.Name == roleName); // dbcontext is here disposed...
return user.Any();
}
public override string[] GetRolesForUser(string username)
{
var user = _userRepository.AsQueryable().Where(x => x.Username == username).Select(x => x.Role.Name); // dbcontext is here disposed...
return user.ToArray();
}
// omitted...
}
IGenericRepository<T>
實現
public class GenericRepository<T> : IGenericRepository<T>
where T : class
{
private readonly MyContext _context;
private readonly DbSet<T> _dbSet;
public GenericRepository(MyContext context)
{
_context = context;
_dbSet = context.Set<T>();
}
public IQueryable<T> AsQueryable()
{
return _dbSet.AsQueryable();
}
}
錯誤信息
[InvalidOperationException: The operation cannot be completed because the DbContext has been disposed.]
System.Data.Entity.Internal.InternalContext.CheckContextNotDisposed() +34
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +30
System.Data.Entity.Internal.InternalContext.Initialize() +21
System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +20
System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +79
System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() +21
System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +64
System.Linq.Queryable.Where(IQueryable`1 source, Expression`1 predicate) +81
Presentation.Web.Providers.CustomRoleProvider.GetRolesForUser(String username) in ~\Application\Presentation.Web\Providers\CustomRoleProvider.cs:38
System.Web.Security.RolePrincipal.IsInRole(String role) +183
Presentation.Web.Controllers.BaseController.OnActionExecuting(ActionExecutingContext filterContext) in ~\Application\Presentation.Web\Controllers\BaseController.cs:27
...
顯然,RoleProvider的生命周期是MVC應用程序的整個生命周期。 (不記得我在哪里讀它)
所以必須解決每種方法中的依賴關系:(
public class CustomRoleProvider : RoleProvider
{
public override bool IsUserInRole(string username, string roleName)
{
var userRepository = DependencyResolver.Current.GetService<IGenericRepository<User>>();
var user = userRepository .AsQueryable().Where(x => x.Username == username && x.Role.Name == roleName); // dbcontext is here disposed...
return user.Any();
}
public override string[] GetRolesForUser(string username)
{
var userRepository = DependencyResolver.Current.GetService<IGenericRepository<User>>();
var user = userRepository .AsQueryable().Where(x => x.Username == username).Select(x => x.Role.Name); // dbcontext is here disposed...
return user.ToArray();
}
// omitted...
}
不明白為什么這不起作用
kernel.Bind<MyContext>().ToSelf().WhenInjectedInto<RoleProvider>();
我甚至嘗試添加InSingletonScope
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