我使用的是asp.net mvc,Entityframework 6和Unity for DI場景。已經處理了DbContext對象:如何防止對象被丟棄?
我找不到爲什麼我的DbContext對象被放置得太早。
我將GenericWoU類注入到PeopleController
類中。當我調用ListPerson動作時,一切正常,但是DbContext被處置。所以,如果我嘗試編輯列表中的任何人,出現以下錯誤:
的操作無法完成,因爲的DbContext一直 佈置
我怎樣才能防止被設置在的DbContext太早了?
這是我的工作類的通用單位:
public class GenericUoW : IDisposable, IGenericUoW
{
private readonly DbContext entities = null;
public Dictionary<Type, object> repositories = new Dictionary<Type, object>();
public GenericUoW(DbContext entities)
{
this.entities = entities;
}
public IRepository<T> Repository<T>() where T : class
{
if (repositories.Keys.Contains(typeof(T)) == true)
{
return repositories[typeof(T)] as IRepository<T>;
}
IRepository<T> repo = new GenericRepository<T>(entities);
repositories.Add(typeof(T), repo);
return repo;
}
public void SaveChanges()
{
entities.SaveChanges();
}
private bool disposed = false;
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
entities.Dispose();
}
}
this.disposed = true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}
這裏是我GenericRepository
類:
class GenericRepository<T> : IRepository<T> where T : class
{
private readonly DbContext entities = null;
private DbSet<T> _objectSet;
public GenericRepository(DbContext _entities)
{
entities = _entities;
_objectSet = entities.Set<T>();
}
public IEnumerable<T> GetAll(Func<T, bool> predicate = null)
{
if (predicate != null)
{
return _objectSet.Where(predicate);
}
return _objectSet.AsEnumerable();
}
public T Get(Func<T, bool> predicate)
{
return _objectSet.First(predicate);
}
public void Add(T entity)
{
_objectSet.Add(entity);
}
public void Attach(T entity)
{
_objectSet.Attach(entity);
}
public void Delete(T entity)
{
_objectSet.Remove(entity);
}
}
這裏是我ContainerBootstrapper類:
public class ContainerBootstrapper
{
public static IUnityContainer Initialise()
{
var container = BuildUnityContainer();
DependencyResolver.SetResolver(new UnityDependencyResolver(container));
return container;
}
private static IUnityContainer BuildUnityContainer()
{
var container = new UnityContainer();
DbContext entities = new TeijonStuffEntities();
container.RegisterInstance(entities);
GenericUoW GUoW = new GenericUoW(entities);
container.RegisterInstance(GUoW);
MvcUnityContainer.Container = container;
return container;
}
}
你不應該執行'IDisposable'上'GenericUoW'。不要注入處理注入的依賴關係,因爲消費類沒有依賴關係的所有權(只有組合根和容器),它不知道依賴關係(本例中的DbContext)應該是是否處置。除去「Dispose」功能可能會真正解決您的問題,但很難說清楚,因爲缺少足夠的詳細信息來描述確切原因。 – Steven
相關:https://stackoverflow.com/questions/12259534/is-it-a-leaky-abstraction-if-implementation-of-interface-calls-dispose – Steven
相關:https://stackoverflow.com/a/30287923/264697 – Steven