CoreApplication.EnteredBackground Event

Definition

Fired when the app enters the running in the background state.

// Register
event_token EnteredBackground(EventHandler<EnteredBackgroundEventArgs> const& handler) const;

// Revoke with event_token
void EnteredBackground(event_token const* cookie) const;

// Revoke with event_revoker
EnteredBackground_revoker EnteredBackground(auto_revoke_t, EventHandler<EnteredBackgroundEventArgs> const& handler) const;
public static event System.EventHandler<EnteredBackgroundEventArgs> EnteredBackground;
function onEnteredBackground(eventArgs) { /* Your code */ }
Windows.ApplicationModel.Core.CoreApplication.addEventListener("enteredbackground", onEnteredBackground);
Windows.ApplicationModel.Core.CoreApplication.removeEventListener("enteredbackground", onEnteredBackground);
- or -
Windows.ApplicationModel.Core.CoreApplication.onenteredbackground = onEnteredBackground;
Public Shared Custom Event EnteredBackground As EventHandler(Of EnteredBackgroundEventArgs) 

Event Type

EventHandler<EnteredBackgroundEventArgs>

Windows 10 requirements

Device family
Windows 10 Anniversary Edition (introduced in 10.0.14393.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v3.0)

Remarks

This event is fired when your app is no longer visible in the foreground.

Previously your suspending callback was the best place to save state after a user finished a session with your app. However, now an application may continue running in the background and then move back to the foreground due to trigger activity without ever reaching the suspended state. The best place to save data after a user session is in your entered background event handler.

Memory limits also change as an app moves into the background. It is best to check the MemoryManager and release memory if needed to ensure your app does not get terminated.

Applies to

See also