ActiveRecord 3 RC 1 与 NHibernate 3.2 导致意外异常

Question

由于前几天我感到很冒险，所以我决定使用 NHibernate 3.2 编译 ActiveRecord 3 RC 1，看看会发生什么。
除了我修复的重大更改之外，我还遇到了有关 SessionScopes 和 Linq 查询的非常奇怪的行为。
通常，在使用 Linq 查询时，我不必使用会话范围，但在使用 NHibernate 3.2 编译 ActiveRecord 3 RC 1 后，出现以下错误：

Could not found a registered Scope. Linq queries needs a underlying a scope to be functional.
Stack Trace:    at Castle.ActiveRecord.Framework.ActiveRecordLinqBase`1.get_Queryable()
   at Castle.ActiveRecord.Framework.ActiveRecordLinq.AsQueryable[T]()
   at Danel.Nursing.Scheduling.Actions.DataServices.BranchDataService.GetBranches() in D:\Work\Default\Scheduling\Danel.Nursing.Scheduling.Actions\DataServices\BranchDataService.cs:line 21
   at Danel.Nursing.Scheduling.Controllers.SmallHoursAmountController.<>c__DisplayClassb.<SetBranches>b__a() in D:\Work\Default\Scheduling\Danel.Nursing.Scheduling\Controllers\SmallHoursAmountController.cs:line 275
   at Danel.Nursing.Scheduling.Viewlets.WaitForAction.Worker_DoWork(Object sender
DoWorkEventArgs e) in D:\Work\Default\Scheduling\Danel.Nursing.Scheduling\Viewlets\WaitForAction.cs:line 40

看来该错误来自这里：

public class ActiveRecordLinqBase<T> : ActiveRecordBase<T>
{
        public static IOrderedQueryable<T> Queryable
        {
            get
            {
                var activeScope = holder.ThreadScopeInfo.GetRegisteredScope(); // The registered scope is null...

                if (activeScope == null)
                    throw new ActiveRecordException("Could not found a registered Scope. Linq queries needs a underlying a scope to be functional.");

                var key = holder.GetSessionFactory(typeof(T));

                var session = activeScope.IsKeyKnown(key) ? activeScope.GetSession(key) : SessionFactoryHolder.OpenSessionWithScope(activeScope, key);

                return session.AsQueryable<T>();
            }
        }
    }

What haschanged that now I have to打开一个新的SessionScope？

Answer 1

我在使用 Queryable 函数时也遇到了一些麻烦。虽然我没有遇到会话范围问题，但我在保存对 IQueryable 检索的对象的更新时遇到了问题。似乎新会话从未在活动范围内注册。我还更改了范围检索，所以也许这对您也有帮助：

   public new IOrderedQueryable<T> Queryable
    {
        get
        {
            ISessionFactory key = ActiveRecordMediator<T>.GetSessionFactoryHolder().GetSessionFactory(typeof(T));
            ISessionScope activeScope = SessionScope.Current;

            if (activeScope == null)
                throw new ActiveRecordException("Could not found a registered Scope. Linq queries needs a underlying a scope to be functional.");

            var session = activeScope.IsKeyKnown(key) ? activeScope.GetSession(key) : OpenSessionWithScope(activeScope, key);

            if (!activeScope.IsKeyKnown(key))
            {
                activeScope.RegisterSession(key,session);
            }
            return session.AsQueryable<T>();
        }
    }