Infralution Support

[MHB]

How are rows handled when child lists change?

My situation is this: I have a row A with two children B and C:

A
|-- B
|-- C

I now save references to rows B and C. Then the object in A's child list (which implements IBindingList) that corresponds to B is removed. Is the reference to C now invalidated? Maybe the row is replaced by a new one? Whichever, the problem is that C.Item is now null.

[Infralution]

The section "Working with Rows" in the task based help gives some guidance on this.

[MHB]

Well, my problem occurs when all of the above is executed inside a method invoked by a user action, so the references are local. I think the problem is that what you are referring to is methods called by the thread(s) that the tree itself creates. Hence, I can never save references from the outside?

[Infralution]

In general get the reference to the row object just before you need to use it and you will be fine. If you obtain a reference to a row object then call VirtualTree.UpdateRows then your row reference will have been disposed. Similarly if you obtain a row reference then change a bound data source you may find that the tree has disposed of the rows.
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Infralution Support