Question

Can I safely modify -I mean: remove and re-add on a different index position- any item that I iterate over using a For Each loop in VB? We are talking about the VB Microsoft.VisualBasic.Collection class.

And if yes: Is this by design, or an implementational detail, that I am building upon then?

I might be too lazy to search hard enough, but the dox don’t seem to say anything about this.

Answer 1

The IEnumerator<T> spec says that you can’t:

An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and its behavior is undefined.

Some collections might not follow this rule.