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TreeView.Expanding 事件

定義

發生于樹狀結構中的節點開始展開時。

適用于 UWP 的對等 WinUI 2 APIMicrosoft.UI.Xaml.Controls.TreeView.Expanding (for WinUI in the Windows 應用程式 SDK,請參閱Windows 應用程式 SDK命名空間) 。

// 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) 

事件類型

適用於