1. Windows Developer Day Fall Creators Update Chris Cortes
October 10, 2017
Chris Cortes
UWP Program Manager

2. Multitasking in the Fall Creators Update
Single Process Model and Persistent Events
Chris Cortes
UWP Program Manager

3. 5/26/2018 6:51 AM
Multitasking in UWP
Single Process and Multiple Process Models Multitasking for your Scenario Persistent Events
© 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

4. Single Process Model Activate in Background New Callbacks Suspended
5/26/2018 6:51 AM
Single Process Model
Activate in Background
Launch/Activated
Background Activated
New Callbacks
Leaving Background
Entered Background
Suspended
Terminated
Foreground Resume
Background Resume
© 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

5. Background Media Playback
Add Manifest Entry Use any Windows Audio API Stream to hold Network
<Capabilities>
<uap3:Capability Name="backgroundMediaPlayback“ />
</Capabilities>
var player = new MediaPlayer();
player.Source = MediaSource.CreateFromUri(new Uri("
player.Play();

6. Background Location Tracking
Extended Execution Reason Check Background Access Request in Foreground
private async void StartNavigation(){
session = new ExtendedExecutionSession();
session.Reason = ExtendedExecutionReason.LocationTracking;
session.Description = “Turn by Turn Navigation";
session.Revoked += session_Revoked;
var result = await session.RequestExtensionAsync();
if (result == ExtendedExecutionResult.Allowed){
StartPeriodicLocationUpdate(); }
else { CheckBackgroundAccessAndNotifyUser(); }
private async void session_Revoked(object sender, ExtendedExecutionRevokedEventArgs args){
if(args.Reason == ExtendedExecutionRevokedReason.SystemPolicy){
NotifyUser();

7. Run While Minimized
Extended Execution Reason Handle Request Result Handle Revoked Event Battery-Aware
private async void RequestBackgroundProjectCompilation(){
session = new ExtendedExecutionSession();
session.Reason = ExtendedExecutionReason.Unspecified;
session.Description = “Compile Project File";
session.Revoked += session_Revoked;
var result = await session.RequestExtensionAsync();
if (result == ExtendedExecutionResult.Allowed){
StartCompilation(); }
else { CheckBackgroundAccessAndNotifyUser(); }
private async void session_Revoked(object sender, ExtendedExecutionRevokedEventArgs args){
if(args.Reason == ExtendedExecutionRevokedReason.SystemPolicy){
NotifyUser();

8. Restricted Scenarios for Enterprise
5/26/2018 6:51 AM
Restricted Scenarios for Enterprise
ExtendedBackgroundTaskTime
No Execution Time Exceeded on Background Tasks
Background Access and Battery Saver still apply
ExtendedExecutionUnconstrained
ExtendedExecutionForegroundSession
Run while Minimized until Standby
© 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

9. Background Activation with Triggers
5/26/2018 6:51 AM
Background Activation with Triggers
New Triggers and Capabilities Added Each Release
Multi-Instance
Resource Grouping
Task Grouping
Background Activated
Overridden Method in XAML
Event on CoreApplication
Background Access Status
User Controls in Settings
Battery Saver
© 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. Persistent Event Creation
Background Activation for Frameworks Separate Registrations from AllTasks Background Task Registration Group Event Create Event Registration Token Table .
const string MyTaskGroupId = "4F8904E0-3F25-9A0C-41D3-0305E82C3333";
const string MyTaskGroupDebugName = "My Task Group";
var group = BackgroundTaskRegistration.GetTaskGroup(MyTaskGroupId);
if (group == null) {
     group = new BackgroundTaskRegistrationGroup(MyTaskGroupId, MyTaskGroupDebugName); }
var builder = new BackgroundTaskBuilder();
builder.Name = "Tasks Name";
builder.IsNetworkRequested = true;
builder.TaskEntryPoint = "Tasks.MyTask";
builder.SetTrigger(myTrigger));
builder.TaskGroup = group;
builder.Register();

11. Persistent Event Usage
Background Activation for Frameworks App Subscribes to Event App Unsubscribes to Unregister
public App(){
    this.InitializeComponent();
    this.Suspending += OnSuspending;
    PersistentEvents.MaintenanceWindow += BgWork.Maintenance; }
public static void Maintenance(object sender, PersistentEventArgs e) {
     var def = e.GetDeferral();
     UpdateUserContent();
     def.Complete();  }

12. Multitasking with the Single Process Model
5/26/2018 6:51 AM
Multitasking with the Single Process Model
Background Media Playback Location Tracking Run While Minimized Restricted Scenarios for Enterprise Background Activation Persistent Events
© 2014 Microsoft Corporation. All rights reserved. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

13. Additional Information
Single Process Model: resume/app-lifecycle Background Activation: resume/create-and-register-an-inproc-background-task Background Task Registration Groups: us/windows/uwp/launch-resume/group-background-tasks Manifest Attributes for Background Tasks: us/windows/uwp/launch-resume/declare-background-tasks-in-the-application- manifest

14. Code Samples
Background Media Playback: universal-samples/tree/master/Samples/BackgroundMediaPlayback Extended Execution: samples/tree/master/Samples/ExtendedExecution Background Activation: universal-samples/tree/master/Samples/BackgroundActivation Persistent Events: Events