代码

上下文

public class BindSolutionContext : DbContext
{
    public DbSet<Project> Projects { get; set; }
    public DbSet<User> Users { get; set; }
    public DbSet<Role> Roles { get; set; }
    public DbSet<Address> Addresses { get; set; }
    public DbSet<ProjectImage> ProjectImages { get; set; }

    public BindSolutionContext()
        : base("name=Data")
    {
        Database.SetInitializer(new DropCreateDatabaseIfModelChanges<BindSolutionContext>());
    }
}

Ninject

kernel.Bind<BindSolutionContext>().ToSelf().InRequestScope();

kernel.Bind<IProjectRepository>().To<ProjectRepository>().InRequestScope();
kernel.Bind<IUserRepository>().To<UserRepository>().InRequestScope();
kernel.Bind<IRoleRepository>().To<RoleRepository>().InRequestScope();
kernel.Bind<IAddressRepository>().To<AddressRepository>().InRequestScope();
kernel.Bind<IProjectImageRepository>().To<ProjectImageRepository>().InRequestScope();

存储库

public class ProjectRepository : IProjectRepository
{
    private readonly BindSolutionContext _context;

    public ProjectRepository(BindSolutionContext context)
    {
        _context = context;
    }

    public IQueryable<Project> Query(params Expression<Func<Project, object>>[] includeProperties)
    {
        return includeProperties.Aggregate<Expression<Func<Project, object>>,
            IQueryable<Project>>(_context.Projects, (current, includeProperty) => current.Include(includeProperty));
    }

    public IQueryable<Project> Query(int pageIndex, int pageSize, params Expression<Func<Project, object>>[] includeProperties)
    {
        return includeProperties.Aggregate<Expression<Func<Project, object>>,
            IQueryable<Project>>(_context.Projects, (current, includeProperty) => current.Include(includeProperty)).OrderBy(p => p.Name).Skip(pageIndex).Take(pageSize);
    }

    //Rest of Implementation
}

对于ProjectImageRepository，AddressRepository，RoleRepository和UserRepository实施遵循相同的模式！

public class BindUserProvider : MembershipProvider
{
    [Inject]
    public IUserService UserService { get; set; }

    //Rest of implementation
}


public class BindRoleProvider : RoleProvider
{
    private IRoleService _roleServ;
    private IRoleService RoleServ { get { return _roleServ ?? (_roleServ = DependencyResolver.Current.GetService<IRoleService>()); } }

    private IUserService _userServ;
    private IUserService UserServ { get { return _userServ ?? (_userServ = DependencyResolver.Current.GetService<IUserService>()); } }

    //Rest of implementation
}

由于范围是请求，Ninject应该在请求结束时处理对象。但在某些情况下，在最终确定请求之前会发生处理。

尝试

我不确定问题是否与自定义成员身份有关，但是做了一些测试。如下：

Ninject

kernel.Bind<BindSolutionContext>().ToSelf().InTransientScope();

kernel.Bind<IProjectRepository>().To<ProjectRepository>().InSingletonScope();
kernel.Bind<IUserRepository>().To<UserRepository>().InSingletonScope();
kernel.Bind<IRoleRepository>().To<RoleRepository>().InSingletonScope();
kernel.Bind<IAddressRepository>().To<AddressRepository>().InSingletonScope();
kernel.Bind<IProjectImageRepository>().To<ProjectImageRepository>().InSingletonScope();

所以没有更多的错误！

但又出现了另一个问题！由于repository和context是单例对象，因此不会更新。

例如，如果我为项目注册了新地址，则集合project.Addresses不会更新！

注意：地址已在数据库中注册，没有任何问题！

Answer 1

成员资格和角色提供者的生命周期比请求更长。对象永远不应该依赖于较短的对象（除非在方法执行期间本地创建和销毁），因为它们最终会引用已处置的对象。

由于您希望新的上下文foreach请求避免使用缓存对象，因此您不得将上下文注入存储库，而是使用方法调用从外部传递它，并使用工厂在服务或提供程序中创建它。

Answer 2

要避免此异常，请在具有较长生命周期的类（操作过滤器，成员资格提供程序等）中使用DependencyResolver.Current.GetService（）而不是注入属性。此方法不是测试友好的，但它允许您在使用InRequestScope（）时访问当前http请求的数据上下文实例。

Answer 3

我删除了依赖注入并以这种方式做到了......

    public class CustomRoleProvider:RoleProvider
    {
        private IGroupService _groupService;
        private MyDbContext context;

         public CustomRoleProvider()
         {
              //  _groupService = DependencyResolver.Current.GetService<IGroupService>();
              context = new MyDbContext();
             _groupService = new GroupService(new GroupRepository(context), new AccountRepository(context));

         }

    }

自定义成员资格+ Ninject + InRequestScope =已经处理了ObjectContext实例

代码

尝试

3 个答案: