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Background Agent Expiry in Windows Phone 8

Stats Licenced CPOL. Windows Phone 8 Background Agent Part 1: Periodic Task. Sheikh Jubair , 4 Apr Rate this: Please Sign up or sign in to vote. Introduction Scheduled tasks and background agents can run when the application is not running in the foreground. It can be periodic or resource intensive or can be both.

Windows Phone 8 Background Agents – Rob Tiffany

The schedule depends on which type of task it is registered. Do not use critical logic at background agent because they may not run. Constraints for All Scheduled Task Both Periodic and Resource Intensive There are some constraints for both periodic and resource intensive tasks that we should remain careful about: This value must be set within two weeks.

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If Background agent calls Update ShellTileData to update the tile, the expiration time is automatically extended to two weeks. If application display notification in lock screen, the time will be automatically extended to two weeks whenever your background agent calls.

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Agent Unscheduled After Two Consecutive Crash If the application has two consecutive crashes, the background agent will be unscheduled. Periodic Agents There are some fixed constraints for periodic agents. Scheduled Interval Typically run every 30 minutes Scheduled duration Periodic agents typically run for 25 seconds Battery Saver Mode If this mode on, periodic agents will not run Per device periodic agent limit Only 6 periodic agents are allowed per device Creating a Simple Periodic Agent Step by Step Follow the steps given below: In solution explorer, double click on ScheduledAgent.

Scheduler; using Microsoft. This method is called when Background agent is launched. LaunchForTest task. The following steps walk you through creating a simple app that uses scheduled tasks to register a background agent. This template is in the Windows Phone category. Next, add a Scheduled Task project to your solution. Next, in your foreground app project, you need to add a reference to the agent project. In SolutionExplorer , click your foreground app project to select it. Next, from the Project menu, select Add Reference….

In the Add Reference dialog, select the Projects tab.

Introduction

Update your app manifest file to register your background agent. In the Tasks element, below the DefaultTask element, add the ExtendedTask element, shown in the following code. The Specifier attribute must have the value ScheduledTaskAgent. The other attributes should reflect the name you gave your scheduled task agent when you added it to the project in the preceding steps.

In SolutionExplorer , double-click ScheduledAgent.

You will see that this file contains the definition for a single class, ScheduledAgent, which inherits from the base class ScheduledTaskAgent. For this example, add a using directive for the Shell namespace and the System namespace to the top of the file.

Your Answer

There is one method implemented in the class, OnInvoke ScheduledTask. This method is called by the operating system when the Scheduled Task is launched.

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This is where you should place the code you want to execute when your background agent is run. Each app can have only one ScheduledTaskAgent registered at a time, but you can schedule this agent as both a resource-intensive agent and a periodic agent. If your app uses both a ResourceIntensiveTask and a PeriodicTask , you can check the type of the ScheduledTask object that is passed into the OnInvoke method to determine for which task the agent is being invoked and branch your code execution as necessary. If you use only one type of agent, you do not need to check the ScheduledTask object type.

In this example, the agent launches a ShellToast object from OnInvoke , indicating the type of scheduled task for which the agent is being called. This toast will let you see when the agent is running. However, it will not be displayed while your foreground app is running. When your Scheduled Task code has completed, you should call NotifyComplete to let the operating system know that you no longer need to execute.

This allows the operating system to attempt to schedule other agents. The LaunchForTest String, TimeSpan method is provided so that you can run your agent on a more frequent schedule than it will run on an actual device. This method is only for app development. It will not function except for in apps that are deployed using the development tools.

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