[SimpleBackgroundTransfer] Fix #71(#37341 in bugzilla) + code formatting and refactoring

SimpleBackgroundTransfer/SimpleBackgroundTransfer/AppDelegate.cs

@@ -3,10 +3,8 @@ using Foundation;
 using UIKit;
 
 namespace SimpleBackgroundTransfer {
-
 	[Register ("AppDelegate")]
-	public partial class AppDelegate : UIApplicationDelegate {
-
+	public class AppDelegate : UIApplicationDelegate {
 		public Action BackgroundSessionCompletionHandler { get; set; }
 
 		public override UIWindow Window { get; set; }

SimpleBackgroundTransfer/SimpleBackgroundTransfer/Info.plist

@@ -11,9 +11,9 @@
 	<key>UIMainStoryboardFile</key>
 	<string>MainStoryboard</string>
 	<key>MinimumOSVersion</key>
-	<string>7.0</string>
+	<string>9.0</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.SimpleBackgroundTransfer.BackgroundSession</string>
+	<string>com.xamarin.BackgroundSession</string>
 	<key>CFBundleIconFiles</key>
 	<array>
 		<string>Icon</string>

SimpleBackgroundTransfer/SimpleBackgroundTransfer/Main.cs

@@ -1,13 +1,7 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Foundation;
 using UIKit;
 
-namespace SimpleBackgroundTransfer
-{
-	public class Application
-	{
+namespace SimpleBackgroundTransfer {
+	public class Application {
 		// This is the main entry point of the application.
 		static void Main (string[] args)
 		{

SimpleBackgroundTransfer/SimpleBackgroundTransfer/SimpleBackgroundTransferViewController.cs

@@ -1,5 +1,5 @@
 using System;
-using CoreGraphics;
+
 using Foundation;
 using UIKit;
 
@@ -56,7 +56,7 @@ namespace SimpleBackgroundTransfer {
 		public NSUrlSession InitBackgroundSession ()
 		{
 			Console.WriteLine ("InitBackgroundSession");
-			using (var configuration = NSUrlSessionConfiguration.BackgroundSessionConfiguration (Identifier)) {
+			using (var configuration = NSUrlSessionConfiguration.CreateBackgroundSessionConfiguration (Identifier)) {
 				return NSUrlSession.FromConfiguration (configuration, new UrlSessionDelegate (this), null);
 			}
 		}
@@ -144,12 +144,14 @@ namespace SimpleBackgroundTransfer {
 
 		public override void DidFinishEventsForBackgroundSession (NSUrlSession session)
 		{
-			AppDelegate appDelegate = UIApplication.SharedApplication.Delegate as AppDelegate;
-			var handler = appDelegate.BackgroundSessionCompletionHandler;
-			if (handler != null) {
-				appDelegate.BackgroundSessionCompletionHandler = null;
-				handler ();
+			using (AppDelegate appDelegate = UIApplication.SharedApplication.Delegate as AppDelegate) {
+				var handler = appDelegate.BackgroundSessionCompletionHandler;
+				if (handler != null) {
+					appDelegate.BackgroundSessionCompletionHandler = null;
+					handler();
+				}
 			}
+
 			Console.WriteLine ("All tasks are finished");
 		}
 	}