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Expand/Collapse TreeView Nodes on Ctrl+LeftMouse in WPF

Simon Earnshaw

I want to collapse or expand all TreeView nodes under parent node if user holds down Left Control key and presses left mouse button on expansion arrow of tree view.

How do you do this in WPF? It's not as obvious as it was in WinForms.

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta5y ago
WPF treeview doesn't have expand all functionality, you have to loop through the nodes to expand/collapse. See, how you can achieve this https://stackoverflow.com/questions/834081/wpf-treeview-where-is-the-expandall-method