Question

NHibernate版本3.3.1.4000

查询：

IQueryable<Activity> activities = _repository.GetList<Activity>();

IQueryable<ActivityStatistic> statistics = activities
    .GroupBy(activity => activity.ActivityLicense.SerialNumber)
    .Select(grouping => new ActivityStatistic
        {
            ActivityCount = grouping.Count(),
            LicenseCode = grouping.Key              
        })
    .OrderBy(stat => stat.LicenseCode);

List<ActivityStatistic> result = statistics
    .Skip(request.StartIndex)
    .Take(request.Count)
    .ToList();

如果我评论Skip / Take代码，它可以正常工作。在使用LINQ to NHibernate的OrderBy之后，如何在不调用ToList（）的情况下使它一起工作？

提前致谢。

更新

例外：

The method or operation is not implemented.

 at NHibernate.Linq.GroupBy.AggregatingGroupByRewriter.FlattenSubQuery(SubQueryExpression subQueryExpression, QueryModel queryModel)
   at NHibernate.Linq.GroupBy.AggregatingGroupByRewriter.ReWrite(QueryModel queryModel)
   at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)
   at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory)
   at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(String queryIdentifier, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)
   at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)
   at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)
   at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)
   at NHibernate.Linq.DefaultQueryProvider.PrepareQuery(Expression expression, IQuery& query, NhLinqExpression& nhQuery)
   at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)
   at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression expression)
   at Remotion.Linq.QueryableBase`1.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at MBP.AuthorizationService.Logic.LicenseService.GetActivityStatistic(CommonRequest request, Int32& recordsCount) in D:\Projects\MBP.Launcher\MBP.AuthorizationService.Logic\LicenseService.cs:line 201

Answer 1

Michael Petito回答了这个问题：

这是我刚刚遇到的一个已知问题： nhibernate.jira.com/browse/NH-2566 - Michael Petito 8月22日19:56

等待新版本......

LINQ to NHibernate - .GroupBy（）。Skip（）。Take（）导致异常

1 个答案: