CODEWITHSUNDEEP
c#wpfcontrolstreeview
user396932
user396932

Reputation: 21

Expand a treeViewItem Automatically

I have a TreeView that I filled with a list of TreeViewItem from a collection (using the binding), I linked to a TreeView event "Expand" to expand it and display their childrens, my objective now is to get the last TreeViewItem accessed and to initialize the TreeView by the last treeViewItem consulted. I can retrieve the last TreeViewItem consulted and their childrens, but I can not expand it automatically. I use this method, but it returns always null.

TreeViewItem item =control.ItemContainerGenerator.ContainerFromItem(lastItem)as TreeViewItem; item.IsExpanded = true;

item is always null, isExpanded doses not work, and lastItem is a string(the text you see on the screen : is the treeViewItem.datacontext recovred ).

Upvotes: 2

Views: 3279

Answers (2)

Bob.
Bob.

Reputation: 4002

Have you tried using the Expand Subtree method for TreeViewItem class?

The ExpandSubtree() method:

Expands the TreeViewItem control and all its child TreeViewItem elements.

Example:

TreeViewItem item = new TreeViewitem();
item.ExpandSubtree();

Upvotes: 0

Eugene Cheverda
Eugene Cheverda

Reputation: 8940

You should read this CodeProject article on TreeView MVVM approach which will simplify all your work with TreeView and TreeViewItem controls.

Upvotes: 2

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