+ Added import releases from file

src/Anilibria/Pages/MaintenancePage/MaintenancePageView.xaml

@@ -56,7 +56,8 @@
 
 		<Grid
 			Grid.Row="1"
-			Grid.Column="1">
+			Grid.Column="1"
+			VerticalAlignment="Top">
 			<Grid.RowDefinitions>
 				<RowDefinition />
 				<RowDefinition />
@@ -65,7 +66,8 @@
 
 			<Grid
 				Grid.Row="0"
-				VerticalAlignment="Top">
+				VerticalAlignment="Top"
+				Margin="0 24 0 0">
 				<Grid.ColumnDefinitions>
 					<ColumnDefinition Width="240" />
 					<ColumnDefinition />
@@ -90,15 +92,16 @@
 			</Grid>
 			<Grid
 				Grid.Row="1"
-				VerticalAlignment="Top">
+				VerticalAlignment="Top"
+				Margin="0 24 0 0">
 				<Grid.ColumnDefinitions>
 					<ColumnDefinition Width="240" />
 					<ColumnDefinition />
 				</Grid.ColumnDefinitions>
 				<Button
 						Grid.Column="0"
 						Margin="0 4 0 0"
-						Command="{Binding ClearPosterCacheCommand}"
+						Command="{Binding ImportReleasesFromFileCommand}"
 						converters:BackgroundThemeConverter.ActionButton="Origin"
 						VerticalAlignment="Center"
 						HorizontalAlignment="Center">
@@ -113,7 +116,10 @@
 					Позволяет импортировать релизы из файла. Импортированные релизы не будут обновляться.
 				</TextBlock>
 			</Grid>
-
+			<Grid 
+				Grid.Row="2">
+
+			</Grid>
 		</Grid>
 	</Grid>
 </UserControl>

src/Anilibria/Pages/MaintenancePage/MaintenancePageViewModel.cs

@@ -2,16 +2,17 @@
 using Anilibria.Services;
 using Anilibria.Services.Implementations;
 using System;
+using System.IO;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using Windows.Storage;
+using Windows.Storage.Pickers;
 
-namespace Anilibria.Pages.MaintenancePage
-{
-	public class MaintenancePageViewModel : ViewModel, INavigation
-	{
+namespace Anilibria.Pages.MaintenancePage {
+	public class MaintenancePageViewModel : ViewModel, INavigation {
 		private readonly IAnalyticsService m_AnalyticsService;
 
-		private readonly object m_ClearPosterLock = new object();
+		private readonly object m_ClearPosterLock = new object ();
 
 		private const string PosterGroupName = "Poster";
 
@@ -24,6 +25,22 @@ public MaintenancePageViewModel ( IAnalyticsService analyticsService ) {
 		private void CreateCommands () {
 			ClearPosterCacheCommand = CreateCommand ( ClearPosterCache );
 			ShowSidebarCommand = CreateCommand ( OpenSidebar );
+			ImportReleasesFromFileCommand = CreateCommand ( ImportReleasesFromFile );
+		}
+
+		private async void ImportReleasesFromFile () {
+			var openPicker = new FileOpenPicker ();
+			openPicker.ViewMode = PickerViewMode.Thumbnail;
+			openPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
+			openPicker.FileTypeFilter.Add ( ".releases" );
+
+			var file = await openPicker.PickSingleFileAsync ();
+			if ( file == null ) return;
+
+			var content = await FileIO.ReadTextAsync ( file );
+
+			var synchronizeService = SyncService.Current ();
+			await synchronizeService.SynchronizeReleasesFromContent ( content );
 		}
 
 		private void OpenSidebar () => ShowSidebar?.Invoke ();
@@ -56,6 +73,8 @@ public void NavigateTo ( object parameter ) {
 
 		public ICommand ClearPosterCacheCommand { get; set; }
 
+		public ICommand ImportReleasesFromFileCommand { get; set; }
+
 		public ICommand ShowSidebarCommand { get; set; }
 
 	}

src/Anilibria/Services/ISynchronizationService.cs

@@ -17,6 +17,12 @@ public interface ISynchronizationService {
 		/// </summary>
 		Task SynchronizeReleases ();
 
+		/// <summary>
+		/// Synchronize releases from json content.
+		/// </summary>
+		/// <param name="content">Json content.</param>
+		Task SynchronizeReleasesFromContent ( string content );
+
 		/// <summary>
 		/// Synchronize youtubes.
 		/// </summary>

src/Anilibria/Services/Implementations/SynchronizeService.cs

@@ -6,6 +6,7 @@
 using Anilibria.Services.PresentationClasses;
 using Anilibria.Storage;
 using Anilibria.Storage.Entities;
+using Newtonsoft.Json;
 
 namespace Anilibria.Services.Implementations {
 
@@ -186,14 +187,30 @@ private void UpdateCachedRelease ( Release release , ReleaseEntity releaseEntity
 				.ToList ();
 		}
 
+		public async Task SynchronizeReleasesFromContent ( string content ) {
+			await SynchronizeReleasesFromSource (
+				() => Task.FromResult ( JsonConvert.DeserializeObject<IEnumerable<Release>> ( content ) )
+			);
+		}
+
 		public async Task SynchronizeReleases () {
+			await SynchronizeReleasesFromSource (
+				async () => {
+					var releases = await m_AnilibriaApiService.GetPage ( 1 , 2000 );
+					var schedules = await m_AnilibriaApiService.GetSchedule ();
+
+					SaveSchedule ( schedules );
+
+					return releases;
+				}
+			);
+		}
+
+		private async Task SynchronizeReleasesFromSource ( Func<Task<IEnumerable<Release>>> loadContentHandler ) {
 			try {
 				var firstRun = !m_ReleasesService.GetReleases ().Any ();
 
-				var releases = await m_AnilibriaApiService.GetPage ( 1 , 2000 );
-				var schedules = await m_AnilibriaApiService.GetSchedule ();
-
-				SaveSchedule ( schedules );
+				var releases = await loadContentHandler ();
 
 				var cacheReleases = m_ReleasesService.GetReleases ().ToList ();