[0.20] Crash when using indexOf replaceAt

Bug Reports
1

Hello,

build: 0.20.2.6514/6520

My app is crashing with error :

ERROR: Index was out of range. Must be non-negative and less than the size of the collection.
    Parameter name: index
    System.ArgumentOutOfRangeException occured.
      at System.ThrowHelper.ThrowArgumentOutOfRangeException () [0x00000] in <filename unknown>:0 
      at System.Collections.Generic.List1[System.Collections.Generic.List1[Fuse.Node]].get_Item (Int32 index) [0x00000] in <filename unknown>:0 
      at Fuse.Reactive.Each.Fuse.Reactive.IObserver.OnNewAt (Int32 index, System.Object value) [0x00000] in <filename unknown>:0 
      at Uno.Threading.IDispatcherExtensions+Arg2Invoke`2[System.Int32,System.Object].Run () [0x00000] in <filename unknown>:0 
      at Fuse.Reactive.Dispatcher.Run () [0x00000] in <filename unknown>:0 
      at Fuse.UpdateListener.Invoke () [0x00000] in <filename unknown>:0 
      at Fuse.UpdateManager.Update (Fuse.Stage stage) [0x00000] in <filename unknown>:0

I think the crash occurs when trying to use replaceAt() on a observer that has been clear() in the meantime.

2

Hi!

Thanks for the report. I’ve added this thread to an internal ticket that covers cleanup of error handling in connection with Observables.

3

In the meantime a simple workaround is to add an aditionnal check like :

if(my_observable.contains(item)) {
  my_observable.replaceAt(my_observable.indexOf(searchedIteam), item);
}