C# DbContext已在自定义角色提供程序中释放

在我的

CustomRoleProvider

中使用DbContext时，我的DbContext处理有问题

我已将绑定设置为：

kernel.Bind<IUnitOfWork>().To<UnitOfWork>().InRequestScope();
kernel.Bind(typeof(IGenericRepository<>)).To(typeof(GenericRepository<>)).InRequestScope();
kernel.Bind<MyContext>().ToSelf().InRequestScope();

CustomRoleProvider

实现

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...
}

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();
    }
}

---

显然RoleProvider的生命周期就是MVC应用程序的整个生命周期。（不记得我在哪里读过）

因此，必须解决每个方法中的依赖关系：(

公共类CustomRoleProvider:RoleProvider
{
public override bool IsUserInRole（字符串用户名、字符串角色名）
{
var userRepository=DependencyResolver.Current.GetService（）；
var user=userRepository.AsQueryable（）。其中（x=>x.Username==Username&&x.Role.Name==roleName）；//dbcontext在这里被释放。。。
返回user.Any（）；
}
公共重写字符串[]GetRolesForUser（字符串用户名）
{
var userRepository=DependencyResolver.Current.GetService（）；
var user=userRepository.AsQueryable（）。其中（x=>x.Username==Username）。选择（x=>x.Role.Name）；//dbcontext在此处释放。。。
返回user.ToArray（）；
}
//省略。。。
}

我不明白这为什么不起作用

kernel.Bind<MyContext>().ToSelf().WhenInjectedInto<RoleProvider>();

kernel.Bind（）.ToSelf（）.whenInjectedTo（）；

---

我甚至试着在SingletonScope中添加

您似乎已经删除了任何可以帮助我们确定上下文处理位置的代码！您可以添加这些代码吗？您想添加哪些部分？对我来说，这就是所有运行的代码：）好的，

的内容是userinrole

方法的开始。添加。但这很直截了当：）但我们越来越近了。。。如何使用repository

Get

方法？至于为什么最后一行代码没有帮助，您的角色提供程序只创建了一次，因此没有什么区别。但是，如果在注入RoleProvider时DbContext是一个单例，则不应处理它

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...
}

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();
    }
}

[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
   ...

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...
}

kernel.Bind<MyContext>().ToSelf().WhenInjectedInto<RoleProvider>();