TreeGrid with virtualization: Null pointer exception when calling ExpandAllAsync

Question

I have found issues similar to this that were supposed to be fixed, but not this exact one. Hence this post.

I have an SfTreeGrid with EnableVirtualization="true". When I call ExpandAllAsync() on the tree grid, it crashes with a NullPointerException (during execution of the method).

It is easily verifiable with one of your demo projects - I have attached an example. In the example, I am using the Syncfusion.Blazor 20.2.0.40 packages. Furthermore VS Studio 2022 version 17.2.3 and Chrome browser latest version (104.0.5112.81)

Are there any plans to fix this?

On a side note: The expansion/collapse of rows works horribly when virtualization is enabled (e.g. in the attached project - just click expand/collapse on the top row a few times). Is this a known bug?

Thanks,

Niels

Attachment: TreeGridSample_VirtualizationTest_f35e269f.zip

Pon Selva Jeganathan · Accepted Answer

Hi Niels,Thanks
for your patience.We have
considered this as an improvement feature from our end and
logged task for the same as “Need to improve the virtualization
feature with hierarchical data binding and expand/collapse action”. Thank you for
taking the time to report this issue and helping us improve our product. At
Syncfusion, we are committed to fixing all validated defects (subject to
technical feasibility and Product Development Life Cycle ) and this issue fix
will be included in our upcoming Volume 3 SP releaseYou can now
track the current status of your request, review the proposed resolution
timeline, and contact us for any further inquiries through the below feedback
link,   Feedback
link: https://www.syncfusion.com/feedback/36925/need-to-improve-the-virtualization-feature-with-hierarchical-data-binding-and
Please
get back to us if you need any further assistance.Regards,
Pon selva

Pon Selva Jeganathan · Answer

Hi Niels,Thanks for
contacting syncfusion forum.We are able to reproduce the issue at our
end. We are working on this query with high priority. And we need time to
validate the issue at our end. We will update further details by 9th
August 2022. Until then we value your patience. In the meanwhile, we will
contact if any details are required.Regards,  Pon
selva

Niels Døssing · Answer

Hi Pon,Thank you for including this in your upcoming release - I appreciate it!Regards,Niels Døssing

Pon Selva Jeganathan · Answer

Hi Niels,Thanks for the update. We will let you know once the Volume 3 SP release has been
released with the feature.We appreciate your patience until then.Regards,          
Pon selva

Pon Selva Jeganathan · Answer

We are unable to complete it(“Need to improve the
virtualization feature with hierarchical data binding and expand/collapse
action”) as
planned due to some internal complexities. However, we will prioritize and
included it with our Volume 1
2023 release.You can now track the current status of your request,
review the proposed resolution timeline, and contact us for any further
inquiries through the below feedback link, Feedback link: https://www.syncfusion.com/feedback/36925/need-to-improve-the-virtualization-feature-with-hierarchical-data-binding-and

Pon Selva Jeganathan · Answer

Niels,

We are unable to complete it(“Need to improve the
virtualization feature with hierarchical data binding and expand/collapse
action”) as
planned due to some internal complexities. However, we will prioritize and
included it with our upcoming volume release.You can now track the current status of your
request, review the proposed resolution timeline, and contact us for any
further inquiries through the below feedback link, Feedback link: https://www.syncfusion.com/feedback/36925/need-to-improve-the-virtualization-feature-with-hierarchical-data-binding-and