CoreApplication.LeavingBackground 事件

定义

命名空间:

Windows.ApplicationModel.Core

在应用程序 UI 变为可见之前触发。

// Register
static event_token LeavingBackground(EventHandler<LeavingBackgroundEventArgs> const& handler) const;

// Revoke with event_token
static void LeavingBackground(event_token const* cookie) const;

// Revoke with event_revoker
static CoreApplication::LeavingBackground_revoker LeavingBackground(auto_revoke_t, EventHandler<LeavingBackgroundEventArgs> const& handler) const;

public static event System.EventHandler<LeavingBackgroundEventArgs> LeavingBackground;

function onLeavingBackground(eventArgs) { /* Your code */ }
Windows.ApplicationModel.Core.CoreApplication.addEventListener("leavingbackground", onLeavingBackground);
Windows.ApplicationModel.Core.CoreApplication.removeEventListener("leavingbackground", onLeavingBackground);
- or -
Windows.ApplicationModel.Core.CoreApplication.onleavingbackground = onLeavingBackground;

Public Shared Custom Event LeavingBackground As EventHandler(Of LeavingBackgroundEventArgs) 

事件类型

EventHandler<LeavingBackgroundEventArgs>

EventHandler<LeavingBackgroundEventArgs>

Windows 要求

设备系列	Windows 10 Anniversary Edition (在 10.0.14393.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v3.0 中引入)

注解

以前，加载 UI 的最佳位置是在激活或恢复事件处理程序中。 现在，LeavingBackground 事件的处理程序是执行最终检查以确保 UI 已准备好进行演示的最佳位置。 请务必在此时检查可视化资源是否已准备就绪，因为这是应用程序对用户可见之前执行此操作的最后机会。

另请参阅

• LeavingBackgroundEventArgs