TreeView.Expanding Evento

Definición

Espacio de nombres:

Windows.UI.Xaml.Controls

Se produce cuando un nodo del árbol comienza a expandirse.

API de WinUI 2 equivalente para UWP: Microsoft.UI.Xaml.Controls.TreeView.Expanding (para WinUI en el SDK de Aplicaciones para Windows, consulta los espacios de nombres SDK de Aplicaciones para Windows).

// 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;

function onExpanding(eventArgs) { /* Your code */ }
treeView.addEventListener("expanding", onExpanding);
treeView.removeEventListener("expanding", onExpanding);
- or -
treeView.onexpanding = onExpanding;

Public Custom Event Expanding As TypedEventHandler(Of TreeView, TreeViewExpandingEventArgs) 

Tipo de evento

TypedEventHandler<TreeView,TreeViewExpandingEventArgs>