Commented Issue: ArgumentNullException [7639]

Hi Throb,

I tried to migrate the version I use Obtics hoping to have a performance gain for the last
changeset. I am facing a bug, here is the stacktrace:

at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at Obtics.Collections.Patches.StandardPatchBase`2.<TakeSnapshot>b__0()
at Obtics.Collections.Transformations.XLazySnapshotEnumerator.TakeSnapshot[TType](Object transformation, VersionNumber contentVersion, Func`1 generateEnumerable)
at Obtics.Collections.Patches.StandardPatchBase`2.TakeSnapshot()
at Obtics.Collections.Patches.StandardPatchBase`2.GetEnumerator()
at Obtics.Collections.Transformations.NotifyVpcTransformation`2.InitializeBuffer(FlagsState& flags)
at Obtics.Collections.Transformations.OpaqueTransformationBase`3.CallInitializeBuffer(FlagsState& flags)
at Obtics.Collections.Transformations.OpaqueTransformationBase`3.GetEnumeratorEvent()
at Obtics.NCSourcedObjectToVE`2.GetEnumerator()
at Obtics.Collections.Transformations.FilterTransformationBase`3.InitializeBuffer(FlagsState& flags)
at Obtics.Collections.Transformations.OpaqueTransformationBase`3.CallInitializeBuffer(FlagsState& flags)
at Obtics.Collections.Transformations.OpaqueTransformationBase`3.GetEnumeratorEvent()
at Obtics.NCSourcedObjectToVE`2.GetEnumerator()
at Obtics.Collections.Transformations.ConvertTransformationBase`4.GetEnumerator()
at Obtics.Collections.Transformations.ConvertTransformationBase`4.GetEnumeratorEvent()
at Obtics.NCSourcedObjectToVE`2.GetEnumerator()
at Obtics.NCSourcedObjectToVE`2.System.Collections.Generic.IEnumerable<TOut>.GetEnumerator()
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate,TResult](IEnumerable`1 source, TAccumulate seed, Func`3 func, Func`2 resultSelector)
at Obtics.Collections.Transformations.AccumulativeAggregate`3.GetValueDirect()
at Obtics.Collections.Transformations.AggregateBase`2.InitializeBuffer()
at Obtics.Values.Transformations.CachedTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.UnarySelectTransformation`2.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.CascadeTransformation`2.GetValueFromItm(IInternalValueProvider`1 itm)
at Obtics.Values.Transformations.CascadingTransformationBase`3.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.CascadeTransformation`2.GetValueFromItm(IInternalValueProvider`1 itm)
at Obtics.Values.Transformations.CascadingTransformationBase`3.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.PipelineResultTransformation`3.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Arcan.Planning.ViewModels.DynamicWorkDay.get_Value()
at lambda_method(Closure , DynamicWorkDay )
at Obtics.Values.Transformations.PropertyTransformation`2.PropertyClass.GetValue(TIn obj)
at Obtics.Values.Transformations.PropertyTransformation`2.GetValueFromItm(TIn itm)
at Obtics.Values.Transformations.CascadingTransformationBase`3.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.UnarySelectTransformation`2.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.UnarySelectTransformation`2.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.CascadeTransformation`2.GetItmFromSource()
at Obtics.Values.Transformations.CascadingTransformationBase`3.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.UnarySelectTransformation`2.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.CascadeTransformation`2.GetItmFromSource()
at Obtics.Values.Transformations.CascadingTransformationBase`3.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.PipelineResultTransformation`3.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()
at Obtics.Values.Transformations.ExceptionTransformation`2.GetValue()
at Obtics.Values.Transformations.ConvertTransformationBase`2.GetValueEvent()
at Obtics.NCSourcedObjectToVP`2.get_Value()

I think I'll go back to the old, when do you think that a new stable version will be available?

You use your assembly in your projects?
I'd like Microsoft to do a library like yours, because it should ask you a lot of work.

Best regards,
Vincent BOUZON
Comments: ** Comment from web user: vbouzon **

Hi Throb,

I have again this issue =(

Obtics_Silverlight!Obtics.Collections.Patches.StandardPatchBase<System.ServiceModel.DomainServices.Client.EntityCollection<Arcan.Planning.Services.Web.Model.WorkDay>,Arcan.Planning.Services.Web.Model.WorkDay>.TakeSnapshot() Line 281
=> void TakeSnapshot()
{ XLazySnapshotEnumerator.TakeSnapshot<TOut>(this, _ContentVersion, () => SL.Enumerable.ToArray(_Buffer)); }

_Buffer is null, i don't know why...

I have the latest version and my Expression is :

private static readonly Func<Employee, DateTime, bool, IValueProvider<WorkDay>> WorkDayProvider =
ExpressionObserver.Compile((Employee e, DateTime dt, bool r) => e.WorkDays == null ? null : e.WorkDays.AsEnumerable().SingleOrDefault(wd => wd.Date == dt && wd.IsRealized == r));

I need your help.

Best regards,
Vincent