Fixes. Preparing for submission

FoxTube.Background/BackgroundProcessor.cs

@@ -1,6 +1,7 @@
 using Google.Apis.Services;
 using Google.Apis.YouTube.v3;
 using Google.Apis.YouTube.v3.Data;
+using Microsoft.AppCenter.Analytics;
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
@@ -16,7 +17,7 @@ namespace FoxTube.Background
     public sealed class BackgroundProcessor : IBackgroundTask
     {
         private DateTime lastCheck = DateTime.Now;
-        private ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
+        private readonly ApplicationDataContainer settings = ApplicationData.Current.LocalSettings;
         private YouTubeService Service => new YouTubeService(new BaseClientService.Initializer()
         {
             ApiKey = "AIzaSyBgHrCnrlzlVmk0cJKL8RqP9Y8x6XSuk_0",
@@ -29,6 +30,7 @@ namespace FoxTube.Background
             try
             {
                 def = taskInstance.GetDeferral();
+                taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
 
                 if (settings.Values["lastCheck"] == null)
                 {
@@ -45,7 +47,6 @@ namespace FoxTube.Background
                 if (notificationsSettings[1])
                     await CheckAccount();
             }
-            catch { }
             finally
             {
                 settings.Values["lastCheck"] = DateTime.Now.ToString();
@@ -53,6 +54,15 @@ namespace FoxTube.Background
             }
         }
 
+        private void OnCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
+        {
+            Analytics.TrackEvent("Background task caneled", new Dictionary<string, string>()
+            {
+                { "Reason", reason.ToString() }
+            });
+            settings.Values["lastCheck"] = DateTime.Now.ToString();
+        }
+
         async Task CheckAccount()
         {
             try