TreeView.Expanding Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs when a node in the tree starts to expand.
This documentation applies to WinUI 2 for UWP (for WinUI in the Windows App SDK, see the Windows App SDK namespaces).
// Register
event_token Expanding(TypedEventHandler<TreeView, TreeViewExpandingEventArgs const&> const& handler) const;
// Revoke with event_token
void Expanding(event_token const* cookie) const;
// Revoke with event_revoker
TreeView::Expanding_revoker Expanding(auto_revoke_t, TypedEventHandler<TreeView, TreeViewExpandingEventArgs const&> const& handler) const;public event TypedEventHandler<TreeView,TreeViewExpandingEventArgs> Expanding;Public Custom Event Expanding As TypedEventHandler(Of TreeView, TreeViewExpandingEventArgs)