ObjectContext 实例已在 InRequestScope 中释放!
我在网络上尝试了几个小时,试图解决一个问题。
The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.
我发现有几篇文章和帖子有同样的问题,如 this , this , this和 this
我尝试了所有方法,但总是出现错误。
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>());
}
}
注入(inject)
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
}
ProjectImageRepository
、AddressRepository
、RoleRepository
和UserRepository
实现遵循相同的模型!
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,处置发生在完成请求之前。
尝试
我不确定问题是否与自定义成员有关,但做了一些测试。如下:
注入(inject)
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!
但是另一个问题出现了!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一个新地址,集合 project.Addresses
不会更新!
注意:地址在数据库中注册没有任何问题!
最佳答案
Membership 和 RoleProvider 的生命周期比请求长。对象永远不应依赖于较短生命周期的对象(除非在方法执行期间在本地创建和销毁),因为它们最终会引用已处置的对象。
由于您希望每个请求都有一个新的上下文以避免缓存对象,因此您不能将上下文注入(inject)存储库,而是通过方法调用从外部传递它,并在服务中创建它,或者使用工厂在提供者中创建它。
关于asp.net-mvc-3 - 自定义成员资格 + Ninject + InRequestScope = ObjectContext 实例已被处置,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8452904/