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4
Votes

Parent nodes are not expanded when DataSource is refreshed, even if Expanded property is set to true

Hi!


I have a TreeView with DataSource bound to Local Hierarchical data, similar to what is shown in 

https://blazor.syncfusion.com/documentation/treeview/data-binding#hierarchical-data 


If, on initializing the TreeView, I set one of the parent nodes as Expanded = true (as is done for Folder Id 02 "Others" in the aforementioned example), it works fine (the parent node is show as expanded).


However, if I try to rebind the DataSource by creating a new item List and one of the parent nodes has its Expanded property set to true, it is shown as collapsed anyway.


The only way I managed to expand the parent node after rebinding the DataSource was by invoking 

ExpandAllAsync() method (AFTER invoking StateHasChanged()), but it is a rather hacky solution, IMO.


Can you please check and advise?


Best regards,

Marco.