通过

TreeView.Expanding 事件

  • 参考

定义

命名空间:
Windows.UI.Xaml.Controls
编辑

当树中的节点开始展开时发生。

适用于 UWP 的等效 WinUI 2 API：Microsoft.UI.Xaml.Controls.TreeView.Windows 应用 SDK中的 WinUI 扩展 (，请参阅Windows 应用 SDK命名空间) 。

// 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)

事件类型

TypedEventHandler<TreeView,TreeViewExpandingEventArgs>

适用于