Toggling Header/Footer in CollectionView Dynamically throws an exception #25743
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… in CollectionView Dynamically
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Hey there @Vignesh-SF3580! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed. |
jsuarezruiz
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jsuarezruiz
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Nov 11, 2024
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rmarinho
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Nov 12, 2024
| @@ -577,7 +577,7 @@ internal void UpdateView(object view, DataTemplate viewTemplate, ref UIView uiVi | |||
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| uiView?.Dispose(); | |||
| uiView = null; | |||
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| formsElement?.Handler?.DisconnectHandler(); | |||
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Do we need this fix on ItemsViewController2 ?
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@rmarinho ,
I've tested this scenario with CollectionViewHandler2, and since the header and footer handling differs in that implementation, the issue does not occur. Dynamically setting the header, footer, and empty view to null works without any exceptions in CollectionViewHandler2, so this fix isn't needed there.
rmarinho
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Nov 18, 2024
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Root Cause
The issue occurred when toggling the header template in a
CollectionView. Specifically, when the header was set tonulland then re-assigned, anObjectDisposedExceptionwas thrown. This happened because the platform UIView associated with the header was disposed when toggled off, but the handler for theVisualElementwas not cleared, leading to a stale reference.Description of Change
To resolve the issue, I utilized the
DisconnectHandler()method provided by MAUI, which cleanly disconnects the handler from its associated platform view. This ensures that all resources tied to the handler are properly released, preventing any stale references. After callingDisconnectHandler(),formsElementis set tonullto fully clear the reference, allowing the framework to initialize a fresh handler as needed. This approach maintains a consistent view lifecycle and prevents exceptions caused by attempting to access disposed views.Tested the behaviour in the following platforms
Issues Fixed
Fixes #25724
Screenshots
BeforeFix.mov
Afterfix.mov