Content added ontop of old content when RaisePropertyChanged

[Spencer Bosley]

Hello,

I am having a problem working with the SfAccordion/Expander. I have ObservableCollection<ItemInfo> AccordionInfo Bound to the accordion's BindableLayout.ItemsSource, DisplayTime (string property of ItemInfo) bound to the headers label text, and Items (OberservableCollection property of ItemInfo) bound to the ItemsSource of my sfListView which is my accordionitem content.

Whenever I use RaisePropertyChanged($"AccordionInfo"), instead of clearing the old items and setting the new items to the newly changed AccordionInfo, it keeps the old items and adds the new items with new headers to the bottom of the accordion.

Example:

Accordion:

Header 1

     Item1

     Item2

Header 2

     Item 1

Then say I add an Item to header 2 and RaisePropertyChanged($"AccordionInfo"), The new accordion looks like this.

Updated Accordion:

Header 1

     Item1

     Item2

Header 2

     Item 1

Header 1

     Item1

     Item2

Header 2

     Item 1

     Item 2

My items are looking correct under each header, but not not getting rid of the old items and headers.

I will attach pictures of the xaml. Thanks!

Attachment: AccordionPic_8ba726cb.zip

[SaiGanesh Sakthivel]

Hi Spencer,     

     

Thank you using syncfusion products.   

               

#Regarding SfAccordion holds the old items in View after updating its ItemsSource       

We have handled accordion items collection change that is add or remove child in Accordion using OnChildRemoved which is marked as obsolete 4.8.0.1451 without even marking deprecated in previous versions. As of now, we are using Xamarin forms 4.5.0.617 in our source level. We suggest you to use the Xamarin.forms 4.8.0.1364 version in sample level to overcome the reported scenario.      

Or use the same Xamarin version that Syncfusion products supports, unless you may require any other specific features of Xamarin that is available in a later release version.  This is the long recommended sustainable and efficient solution.   

    

You can refer our release notes document like here Xamarin.Forms versions that Syncfusion products upgraded. You can check the release notes for each release for information related to version upgrade.   

   

Regards,   

SaiGanesh Sakthivel  

[Spencer Bosley]

SaiGanesh Sakthivel,

Thank you for the quick reply. I am still having trouble resolving this issue and I didn't understand what you were saying about using OnChildRemoved. 

My xamarin.forms version is 4.8.0.1687

Thank you.

[Lakshmi Natarajan]

Hi Spencer, 

 

We would like to inform you that our implementation for collection update has now become obsolete, due to Xamarin team's change in a future version(4.8) that did not even exist when SF controls provided support to 4.5 version. 

 

Problem Description  

We have used an override method named OnChildRemoved inside our source code which when fired triggers a series of operations. This was removed by the Xamarin team all of a sudden in version 4.8.0.1451. Our source nugets comes compiled with Xamarin.Forms version 4.5.0.617. So when you install 4.8.0.1451 version or upwards to your project that has SF references, this override method we used will no longer be fired and hence the operations triggered from within that method will not be triggered too and thus results in the issue. 

 

Solution 

If you may not require any new features or fix from the Xamarin.Forms version 4.8 or higher, then you can still install a lower version than 4.8 in your application to overcome the reported issue. 

 

Please let us know if you need further assistance. 

 

Regards, 

Lakshmi Natarajan 

[Spencer Bosley]

Thank you for your help!

[Lakshmi Natarajan]

Hi Spencer, 

 

Thank you for the update. 

 

Please let us know if you need further assistance. As always we are happy to help you out. 

 

Regards, 

Lakshmi Natarajan 

 

Pat pat or squeeze fondly or playfully, especially under the chin More (Definitions, Synonyms, Translation)

[William Watterson]

Hi,

Is there any more updates on this issue?

Is there a workaround other than downgrading xamarin forms?

Thanks,

William

[Spencer Bosley]

Hey William,

I made a workaround. Anytime the data is changed in the accordion, call a method "RemoveAccordionDuplicates". This method accesses your accordion from the code behind and compares its current items to the datasources items. Then you can remove the items from the Accordion as needed.

[Spencer Bosley]

You will need to create a simple for loop for this method.

[Lakshmi Natarajan]

Hi Spencer, 

 

Thank you for your valuable suggestion.  

 

Please let us know if you need any further assistance. As always we are happy to help you out. 

 

Regards, 

Lakshmi Natarajan 

 

[Sagar Chopra]

Hello,

Is there a solution to this problem yet by the syncfusion.

I am facing the same issue whenever I update the ItemSource, it gets updated on top of old data.

[Lakshmi Natarajan]

Hi Sagar, 

 

We have fixed the reported issue in version 19.1.0.63. Please update the SfAccordion package to the latest version to resolve the issue.  

 

You can refer to our release notes details for the fix, 

https://help.syncfusion.com/xamarin/release-notes/v19.1.0.63?type=all#sfaccordion-bug-fixes 

 

Please let us know if you need further assistance. 

 

Regards, 

Lakshmi Natarajan