TreeNodeCollection.Item throws exception if node is assigned elsewhere
TreeNodeCollection.Item[Int32] throws an ArgumentException if the node being assigned is already bound to another TreeView or to this TreeView at a different index.
Change description
In previous .NET versions, you can assign a tree node to a collection even if it's already bound to a TreeView. This can lead to duplicated nodes. Starting in .NET 6, TreeNodeCollection.Item[Int32] throws an ArgumentException if the node being assigned is already bound to another TreeView or to this TreeView at a different index.
Change category
This change affects binary compatibility.
Reason for change
Validating the input parameter is consistent with the behavior of other TreeNodeCollection APIs.
Version introduced
.NET 6
Recommended action
Make sure to unbind a TreeNode before assigning it to the collection.
Affected APIs
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