Element.HandlerChanging 事件

定义

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

每当元素的处理程序开始更改时引发。

public:
 event EventHandler<Microsoft::Maui::Controls::HandlerChangingEventArgs ^> ^ HandlerChanging;

public:
 virtual event EventHandler<Microsoft::Maui::Controls::HandlerChangingEventArgs ^> ^ HandlerChanging;

public event EventHandler<Microsoft.Maui.Controls.HandlerChangingEventArgs> HandlerChanging;

member this.HandlerChanging : EventHandler<Microsoft.Maui.Controls.HandlerChangingEventArgs>

Public Event HandlerChanging As EventHandler(Of HandlerChangingEventArgs)