ObservableCollection.Clear() throws exception "index out of range"

Question

I try to clear an existing ObservableCollection by using a simple Collection.Clear().

It throws:

System.ArgumentOutOfRangeException:
The text associated with this error code could not be found.
Index was out of range. Must be non-negative and less than the size of the collection.

This collection is associated with a ComboxBox in a Flyout I just hide before trying to clear. What else should I do?

Sounds like you're using the ObservableCollection from multiple threads at the same time, perhaps? ObservableCollection is not thread-safe. — canton7, Mar 15 '19 at 15:16
Might be answered by: https://stackoverflow.com/a/61559211/7149454 — Nick Kovalsky, Mar 22 '21 at 09:05

score 1 · Answer 1 · answered Mar 18 '19 at 09:06

1

as canton7 suggested my collection was still being used in the Flyout (hiding the flyout is in fact not enough to close/release). The fix is simply to assign/deassign collection to ComboBox.

answered Mar 18 '19 at 09:06

Pierresa

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ObservableCollection.Clear() throws exception "index out of range"

1 Answers1