Convert type checks and null checks into pattern matching

MediaBrowser.Api/ItemUpdateService.cs

@@ -263,8 +263,7 @@ namespace MediaBrowser.Api
             item.Overview = request.Overview;
             item.Genres = request.Genres;
 
-            var episode = item as Episode;
-            if (episode != null)
+            if (item is Episode episode)
             {
                 episode.AirsAfterSeasonNumber = request.AirsAfterSeasonNumber;
                 episode.AirsBeforeEpisodeNumber = request.AirsBeforeEpisodeNumber;
@@ -302,14 +301,12 @@ namespace MediaBrowser.Api
             item.PreferredMetadataCountryCode = request.PreferredMetadataCountryCode;
             item.PreferredMetadataLanguage = request.PreferredMetadataLanguage;
 
-            var hasDisplayOrder = item as IHasDisplayOrder;
-            if (hasDisplayOrder != null)
+            if (item is IHasDisplayOrder hasDisplayOrder)
             {
                 hasDisplayOrder.DisplayOrder = request.DisplayOrder;
             }
 
-            var hasAspectRatio = item as IHasAspectRatio;
-            if (hasAspectRatio != null)
+            if (item is IHasAspectRatio hasAspectRatio)
             {
                 hasAspectRatio.AspectRatio = request.AspectRatio;
             }
@@ -337,16 +334,14 @@ namespace MediaBrowser.Api
 
             item.ProviderIds = request.ProviderIds;
 
-            var video = item as Video;
-            if (video != null)
+            if (item is Video video)
             {
                 video.Video3DFormat = request.Video3DFormat;
             }
 
             if (request.AlbumArtists != null)
             {
-                var hasAlbumArtists = item as IHasAlbumArtist;
-                if (hasAlbumArtists != null)
+                if (item is IHasAlbumArtist hasAlbumArtists)
                 {
                     hasAlbumArtists.AlbumArtists = request
                         .AlbumArtists
@@ -357,8 +352,7 @@ namespace MediaBrowser.Api
 
             if (request.ArtistItems != null)
             {
-                var hasArtists = item as IHasArtist;
-                if (hasArtists != null)
+                if (item is IHasArtist hasArtists)
                 {
                     hasArtists.Artists = request
                         .ArtistItems
@@ -367,20 +361,17 @@ namespace MediaBrowser.Api
                 }
             }
 
-            var song = item as Audio;
-            if (song != null)
+            if (item is Audio song)
             {
                 song.Album = request.Album;
             }
 
-            var musicVideo = item as MusicVideo;
-            if (musicVideo != null)
+            if (item is MusicVideo musicVideo)
             {
                 musicVideo.Album = request.Album;
             }
 
-            var series = item as Series;
-            if (series != null)
+            if (item is Series series)
             {
                 series.Status = GetSeriesStatus(request);
 

MediaBrowser.Api/LiveTv/LiveTvService.cs

@@ -1050,8 +1050,7 @@ namespace MediaBrowser.Api.LiveTv
             {
                 query.IsSeries = true;
 
-                var series = _libraryManager.GetItemById(request.LibrarySeriesId) as Series;
-                if (series != null)
+                if (_libraryManager.GetItemById(request.LibrarySeriesId) is Series series)
                 {
                     query.Name = series.Name;
                 }

MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs

@@ -438,8 +438,7 @@ namespace MediaBrowser.Api.Playback.Hls
         {
             var segmentId = "0";
 
-            var segmentRequest = request as GetHlsVideoSegment;
-            if (segmentRequest != null)
+            if (request is GetHlsVideoSegment segmentRequest)
             {
                 segmentId = segmentRequest.SegmentId;
             }
@@ -690,8 +689,7 @@ namespace MediaBrowser.Api.Playback.Hls
                 return false;
             }
 
-            var request = state.Request as IMasterHlsRequest;
-            if (request != null && !request.EnableAdaptiveBitrateStreaming)
+            if (state.Request is IMasterHlsRequest request && !request.EnableAdaptiveBitrateStreaming)
             {
                 return false;
             }

MediaBrowser.Api/PluginService.cs

@@ -243,9 +243,7 @@ namespace MediaBrowser.Api
             // https://code.google.com/p/servicestack/source/browse/trunk/Common/ServiceStack.Text/ServiceStack.Text/Controller/PathInfo.cs
             var id = Guid.Parse(GetPathValue(1));
 
-            var plugin = _appHost.Plugins.First(p => p.Id == id) as IHasPluginConfiguration;
-
-            if (plugin == null)
+            if (!(_appHost.Plugins.First(p => p.Id == id) is IHasPluginConfiguration plugin))
             {
                 throw new FileNotFoundException();
             }

MediaBrowser.Api/ScheduledTasks/ScheduledTaskService.cs

@@ -123,9 +123,7 @@ namespace MediaBrowser.Api.ScheduledTasks
                 {
                     var isHidden = false;
 
-                    var configurableTask = i.ScheduledTask as IConfigurableScheduledTask;
-
-                    if (configurableTask != null)
+                    if (i.ScheduledTask is IConfigurableScheduledTask configurableTask)
                     {
                         isHidden = configurableTask.IsHidden;
                     }
@@ -142,9 +140,7 @@ namespace MediaBrowser.Api.ScheduledTasks
                 {
                     var isEnabled = true;
 
-                    var configurableTask = i.ScheduledTask as IConfigurableScheduledTask;
-
-                    if (configurableTask != null)
+                    if (i.ScheduledTask is IConfigurableScheduledTask configurableTask)
                     {
                         isEnabled = configurableTask.IsEnabled;
                     }

MediaBrowser.Api/SearchService.cs

@@ -234,20 +234,17 @@ namespace MediaBrowser.Api
             SetThumbImageInfo(result, item);
             SetBackdropImageInfo(result, item);
 
-            var program = item as LiveTvProgram;
-            if (program != null)
+            if (item is LiveTvProgram program)
             {
                 result.StartDate = program.StartDate;
             }
 
-            var hasSeries = item as IHasSeries;
-            if (hasSeries != null)
+            if (item is IHasSeries hasSeries)
             {
                 result.Series = hasSeries.SeriesName;
             }
 
-            var series = item as Series;
-            if (series != null)
+            if (item is Series series)
             {
                 if (series.Status.HasValue)
                 {
@@ -255,17 +252,13 @@ namespace MediaBrowser.Api
                 }
             }
 
-            var album = item as MusicAlbum;
-
-            if (album != null)
+            if (item is MusicAlbum album)
             {
                 result.Artists = album.Artists;
                 result.AlbumArtist = album.AlbumArtist;
             }
 
-            var song = item as Audio;
-
-            if (song != null)
+            if (item is Audio song)
             {
                 result.AlbumArtist = song.AlbumArtists.FirstOrDefault();
                 result.Artists = song.Artists;

MediaBrowser.Api/TvShowsService.cs

@@ -424,9 +424,7 @@ namespace MediaBrowser.Api
 
             if (!string.IsNullOrWhiteSpace(request.SeasonId))
             {
-                var season = _libraryManager.GetItemById(new Guid(request.SeasonId)) as Season;
-
-                if (season == null)
+                if (!(_libraryManager.GetItemById(new Guid(request.SeasonId)) is Season season))
                 {
                     throw new ResourceNotFoundException("No season exists with Id " + request.SeasonId);
                 }

MediaBrowser.Api/UserLibrary/BaseItemsByNameService.cs

@@ -82,8 +82,7 @@ namespace MediaBrowser.Api.UserLibrary
         {
             var parent = GetParentItem(request);
 
-            var collectionFolder = parent as IHasCollectionType;
-            if (collectionFolder != null)
+            if (parent is IHasCollectionType collectionFolder)
             {
                 return collectionFolder.CollectionType;
             }

MediaBrowser.Api/UserLibrary/ItemsService.cs

@@ -199,14 +199,12 @@ namespace MediaBrowser.Api.UserLibrary
                 item = _libraryManager.GetUserRootFolder();
             }
 
-            Folder folder = item as Folder;
-            if (folder == null)
+            if (!(item is Folder folder))
             {
                 folder = _libraryManager.GetUserRootFolder();
             }
 
-            var hasCollectionType = folder as IHasCollectionType;
-            if (hasCollectionType != null
+            if (folder is IHasCollectionType hasCollectionType
                 && string.Equals(hasCollectionType.CollectionType, CollectionType.Playlists, StringComparison.OrdinalIgnoreCase))
             {
                 request.Recursive = true;