In the absence of a stronger guarantee by the implementation, undefined behavior may result from the invocation of any method on a collection that is being mutated by another thread; this includes direct invocations, passing the collection to a method that might perform invocations, and.The code example calls several properties and methods of Collection T to demonstrate the custom event.The example inserts a string using the Insert method and retrieves and sets strings using the default ItemInt32 property (the indexer.

This interface is typically used to pass collections around and manipulate them where maximum generality is desired.Some collection implementations have restrictions on the elements that they may contain.Enull :.equals(e)." This specification should not be construed to imply that invoking Collection.contains with a non-null argument o will cause.equals(e) to be invoked for any element.

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