I have defined my Background Task as follows:
public sealed class BackgroundSynchronization:IBackgroundTask
{
public async void Run(IBackgroundTaskInstance taskInstance)
{
BackgroundTaskDeferral _deferral = taskInstance.GetDeferral();
//code
//Network Calls
//Updating Local DB (SQLite)
myRepository.Save(entity); // Saves entity in SQLite Table, and Entity has a Current DateTime field too.
deferral.Complete();
}
}
And Task Register class as
public static class BackgroundTaskRegister {
public static BackgroundTaskRegistration RegisterBackgroundTask(string taskEntryPoint,string taskName,IBackgroundTrigger trigger,IBackgroundCondition condition)
{
foreach (var cur in BackgroundTaskRegistration.AllTasks)
{
if (cur.Value.Name == taskName)
{
return (BackgroundTaskRegistration)(cur.Value);
}
}
var builder = new BackgroundTaskBuilder();
builder.Name = taskName;
builder.TaskEntryPoint = taskEntryPoint;
builder.SetTrigger(trigger);
if (condition != null)
{
builder.AddCondition(condition);
}
BackgroundTaskRegistration task = builder.Register();
return task;
}
}
And I have registered the triiger in my app as
TimeTrigger myTrigger = new TimeTrigger(15, false);
await BackgroundExecutionManager.RequestAccessAsync();
string entryPoint = "BackgroundTask.BackgroundSynchronization";
string taskName = "Example per 15 minute background task";
BackgroundTaskRegistration tsk = BackgroundTaskRegister.RegisterBackgroundTask(entryPoint, taskName, myTrigger, null);
tsk.Completed += new BackgroundTaskCompletedEventHandler(OnCompleted);
I also have OnComplete method in my App
private async void OnCompleted(IBackgroundTaskRegistration task, BackgroundTaskCompletedEventArgs args)
{
var settings = ApplicationData.Current.LocalSettings;
var message = settings.Values["backgroundSyncStatus"].ToString();
var folder = ApplicationData.Current.LocalFolder;
StorageFile file;
var x = await File.DoesFileExistInLocalAsync("BackgroundTaskSucceedLog.txt");
if (!x)
file = await folder.CreateFileAsync("BackgroundTaskSucceedLog.txt");
else
file = await ApplicationData.Current.LocalFolder.GetFileAsync("BackgroundTaskSucceedLog.txt");
await Windows.Storage.FileIO.AppendTextAsync(file, message.ToString() + " " + DateTime.Now.ToString() + Environment.NewLine);
}
The background tasks triggers successfully, & the data is saved to SQLite DB
myRepository.Save(entity);
table only for the first run. I came to this conclusion as I had logged the entries in
OnComplete
method.
The logger results confused me more
Logger results
2/16/2015 10:51:41 PM <--Data Saved in SQLite for this entry
2/16/2015 11:07:03 PM
2/16/2015 11:22:26 PM
2/16/2015 11:37:39 PM
2/16/2015 11:52:51 PM
2/17/2015 5:33:00 AM <--Data Saved in SQLite for this entry
The data in SQLite is saved only for the first Background Task "for a day". I tried to Debug Background Task., For first run, Everything runs smoothly, & for subsequent run, the compiler after reaching
myRepository.Save(entity);
, jumps directly to OnComplete
method. WHY.???