1

すべてのグループをカスタム クラスに選択し、すべてのアイテムを別のカスタム クラスに選択したいのですが、

私はこれを次のようにしました：

_notificationsManager
    .GetUserNotifications(_repositoryNotifications, _memberShipProvider)
    .GroupBy(x => x.Category)
    .Select(g => new NotificationsGroupData {
          Name = g.Key,
          Notifications = g.Take(3).Select(s => new NotificationData  {
                                           Category = g.Key,
                                           Text = s.Text,
                                           Time = DateTime.Now.Subtract(s.Time)
                                         })
     })

ここで NotificationsGroupData:

public class NotificationsGroupData
{
    public string Name { get; set; }
    public IEnumerable<NotificationData> Notifications { get; set; }
}

そして NotificationData:

public class NotificationData
{
    public virtual TimeSpan Time { get; set; }
    public virtual string Category { get; set; }
    public virtual string Text { get; set; }
}

しかし、これにループを作成しようとすると、エラーが発生します: メソッドまたは操作が実装されていません。

この行で：

@foreach (var group in Model.Notifications)

どうすれば修正できますか？

魚立: コードを次のように更新しました。

_notificationsManager.GetUserNotifications(_repositoryNotifications, _memberShipProvider)
                                             .GroupBy(x => x.Category)
                                             .Select(g => new
                                                 {
                                                     Name = g.Key,
                                                     Notifications =
                                                              g.OrderBy(o => o.Time)
                                                               .Take(3)
                                                               .Select(s => new
                                                                   {
                                                                       Category = g.Key,
                                                                       s.Text,
                                                                       s.Time
                                                                   })
                                                 }).AsEnumerable().Select(g => new NotificationsGroupData
                                                     {
                                                         Name = g.Name,
                                                         Notifications = g.Notifications
                                                                          .Select(s => new NotificationData
                                                                              {
                                                                                  Category = g.Name,
                                                                                  Text = s.Text,
                                                                                  Time = now - s.Time
                                                                              })
                                                     })

そしてここでエラー：

The method or operation is not implemented.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NotImplementedException: The method or operation is not implemented.

Source Error: @foreach (var group in Model.Notifications)

Stack Trace: 


[NotImplementedException: The method or operation is not implemented.] NHibernate.Linq.GroupBy.NonAggregatingGroupByRewriter.FlattenSubQuery(SubQueryExpression subQueryExpression, QueryModel queryModel) +608    NHibernate.Linq.GroupBy.NonAggregatingGroupByRewriter.ReWrite(QueryModel queryModel) +598    NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root) +126    NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory) +208    NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(String queryIdentifier, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory) +51    NHibernate.Engine.Query.HQLExpressionQueryPlan.CreateTranslators(String expressionStr, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory) +100    NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor(String expressionStr, IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory) +74    NHibernate.Engine.Query.HQLExpressionQueryPlan..ctor(String expressionStr, IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory) +53  NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters) +320   NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow) +188    NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression) +164    NHibernate.Linq.DefaultQueryProvider.PrepareQuery(Expression expression, IQuery& query, NhLinqExpression& nhQuery) +152    NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)
+70    NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression) +59    Remotion.Linq.QueryableBase`1.GetEnumerator() +128  System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +61    ASP._Page_Views_Layout_Notifications_cshtml.Execute() in d:\Dev\Projects\ADDE\ADDE\Views\Layout\Notifications.cshtml:21    System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197    System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +103    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +88    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
+291    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13    System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17()
+23    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +245   System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19()
+22    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +176    System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20()
+75    System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +99    System.Web.Mvc.Async.WrappedAsyncResult`1.End()
+50    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27    System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10    System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
+31    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9    System.Web.Mvc.<>c__DisplayClassa.<EndProcessRequest>b__9() +22    System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +10    System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +27   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Action action) +64 System.Web.Mvc.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) +71    System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1464

[HttpException (0x80004005): Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.] System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +3033503    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +76    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +28    System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +19    System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) +463    System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName, String controllerName) +35    ASP._Page_Views_Shared__Layout_cshtml.Execute() in d:\Dev\Projects\ADDE\ADDE\Views\Shared\_Layout.cshtml:33    System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197    System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +103    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +88    System.Web.WebPages.<>c__DisplayClass7.<RenderPageCore>b__6(TextWriter writer) +233    System.Web.WebPages.HelperResult.WriteTo(TextWriter writer) +10    System.Web.WebPages.WebPageBase.Write(HelperResult result) +71    System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +64    System.Web.WebPages.WebPageBase.PopContext() +246    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +95    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
+291    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13    System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17()
+23    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +245   System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19()
+22    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +176    System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20()
+75    System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +99    System.Web.Mvc.Async.WrappedAsyncResult`1.End()
+50    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27    System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10    System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25    System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23    System.Web.Mvc.Async.WrappedAsyncResult`1.End() +55    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult)
+31    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+9629708    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
4

2 に答える 2

1

NHibernate はクエリを SQL に変換できません。最も速い解決策は、NHibernate に渡すのではなく、インメモリ コレクションで選択ステートメントを作成することです。これを試して： 

_notificationsManager
    .GetUserNotifications(_repositoryNotifications, _memberShipProvider)
    .GroupBy(x => x.Category)
    .ToList()
    .Select(g => new NotificationsGroupData {
          Name = g.Key,
          Notifications = g.Take(3).Select(s => new NotificationData  {
                                           Category = g.Key,
                                           Text = s.Text,
                                           Time = DateTime.Now.Subtract(s.Time)
                                         })
     })

もう 1 つのオプションは、クエリを HQL\SQL に記述して NHibernate に渡すことです。これにより、必要な数のデータをデータベースから取得し、後でカスタム エンティティにマップすることができます。

于 2013-04-06T08:08:18.470 に答える