Use SelectToList in PrefetchActionContainer

Author: SergeiPavlov

Orm/Xtensive.Orm/Orm/Building/PrefetchActionContainer.cs

@@ -8,6 +8,7 @@
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
+using Xtensive.Core;
 using Xtensive.Orm.Internals.Prefetch;
 using Xtensive.Orm.Model;
 using Xtensive.Orm.Providers;
@@ -24,8 +25,7 @@ internal sealed class PrefetchActionContainer
     public Action<SessionHandler, IEnumerable<Key>> BuildPrefetchAction()
     {
       fields = associations
-          .Select(association => new PrefetchFieldDescriptor(association.OwnerField, true, false))
-          .ToList()
+          .SelectToList(association => new PrefetchFieldDescriptor(association.OwnerField, true, false))
           .AsReadOnly();
       return Prefetch;
     }