Hi
I need to do some code behind in a custom treeview that derives from
TreeView.
I need to look at the DataContext of all TreeViewItems to select or deselect them.
A precondition is to make sure that ALL
Status values of ALL
ItemContainerGenerators of all treeview items within the tree (in all recursion levels) are of state
ContainersGenerated.
While this can be verified by a tool function, I don't know of a good solution for the case that some of the treeview items are not in state 'ContainersGenerated'.
Usually for a list box or combo one would subscribe to its
StatusChanged event, re-check the status and if OK do the task. However, as for a TreeView I'd need to subscribe to the StatusChanged event of ALL ItemContainerGenerators of ALL treeviewitems, whose number is increasing while the tree builts.
More over I need to unsubscribe the eventhandlers later on. This tends to get ugly and potentially leaky code. So I don't want to use a multiple event handler subscription solution here.
I used the Loaded event of the treeview instead. This is much easier and reliable when the tree loads, however I need to perform the task also when the ItemsSource changes. In this case the tree is already loaded, but the ItemContainerGenerators are not ready in the very moment the data has changed.
So I need to wait again to verfiy that all items are ready.
So the only solution left seems a timer...Ouch
Anyone a better idea?
Thx, Chris
(This is WPF /C# 4.0 no "Async" available)