Fix warnings

Emby.Server.Implementations/Data/SqliteItemRepository.cs

@@ -2776,82 +2776,82 @@ namespace Emby.Server.Implementations.Data
 
         private string FixUnicodeChars(string buffer)
         {
-            if (buffer.IndexOf('\u2013') > -1)
+            if (buffer.IndexOf('\u2013', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2013', '-'); // en dash
             }
 
-            if (buffer.IndexOf('\u2014') > -1)
+            if (buffer.IndexOf('\u2014', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2014', '-'); // em dash
             }
 
-            if (buffer.IndexOf('\u2015') > -1)
+            if (buffer.IndexOf('\u2015', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2015', '-'); // horizontal bar
             }
 
-            if (buffer.IndexOf('\u2017') > -1)
+            if (buffer.IndexOf('\u2017', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2017', '_'); // double low line
             }
 
-            if (buffer.IndexOf('\u2018') > -1)
+            if (buffer.IndexOf('\u2018', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2018', '\''); // left single quotation mark
             }
 
-            if (buffer.IndexOf('\u2019') > -1)
+            if (buffer.IndexOf('\u2019', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2019', '\''); // right single quotation mark
             }
 
-            if (buffer.IndexOf('\u201a') > -1)
+            if (buffer.IndexOf('\u201a', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u201a', ','); // single low-9 quotation mark
             }
 
-            if (buffer.IndexOf('\u201b') > -1)
+            if (buffer.IndexOf('\u201b', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u201b', '\''); // single high-reversed-9 quotation mark
             }
 
-            if (buffer.IndexOf('\u201c') > -1)
+            if (buffer.IndexOf('\u201c', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u201c', '\"'); // left double quotation mark
             }
 
-            if (buffer.IndexOf('\u201d') > -1)
+            if (buffer.IndexOf('\u201d', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u201d', '\"'); // right double quotation mark
             }
 
-            if (buffer.IndexOf('\u201e') > -1)
+            if (buffer.IndexOf('\u201e', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u201e', '\"'); // double low-9 quotation mark
             }
 
-            if (buffer.IndexOf('\u2026') > -1)
+            if (buffer.IndexOf('\u2026', StringComparison.Ordinal) > -1)
             {
-                buffer = buffer.Replace("\u2026", "..."); // horizontal ellipsis
+                buffer = buffer.Replace("\u2026", "...", StringComparison.Ordinal); // horizontal ellipsis
             }
 
-            if (buffer.IndexOf('\u2032') > -1)
+            if (buffer.IndexOf('\u2032', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2032', '\''); // prime
             }
 
-            if (buffer.IndexOf('\u2033') > -1)
+            if (buffer.IndexOf('\u2033', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u2033', '\"'); // double prime
             }
 
-            if (buffer.IndexOf('\u0060') > -1)
+            if (buffer.IndexOf('\u0060', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u0060', '\''); // grave accent
             }
 
-            if (buffer.IndexOf('\u00B4') > -1)
+            if (buffer.IndexOf('\u00B4', StringComparison.Ordinal) > -1)
             {
                 buffer = buffer.Replace('\u00B4', '\''); // acute accent
             }
@@ -3000,7 +3000,6 @@ namespace Emby.Server.Implementations.Data
             {
                 connection.RunInTransaction(db =>
                 {
-
                     var statements = PrepareAll(db, statementTexts).ToList();
 
                     if (!isReturningZeroItems)
@@ -4670,8 +4669,12 @@ namespace Emby.Server.Implementations.Data
 
             if (query.BlockUnratedItems.Length > 1)
             {
-                var inClause = string.Join(",", query.BlockUnratedItems.Select(i => "'" + i.ToString() + "'"));
-                whereClauses.Add(string.Format("(InheritedParentalRatingValue > 0 or UnratedType not in ({0}))", inClause));
+                var inClause = string.Join(',', query.BlockUnratedItems.Select(i => "'" + i.ToString() + "'"));
+                whereClauses.Add(
+                    string.Format(
+                        CultureInfo.InvariantCulture,
+                        "(InheritedParentalRatingValue > 0 or UnratedType not in ({0}))",
+                        inClause));
             }
 
             if (query.ExcludeInheritedTags.Length > 0)
@@ -4680,7 +4683,7 @@ namespace Emby.Server.Implementations.Data
                 if (statement == null)
                 {
                     int index = 0;
-                    string excludedTags = string.Join(",", query.ExcludeInheritedTags.Select(t => paramName + index++));
+                    string excludedTags = string.Join(',', query.ExcludeInheritedTags.Select(t => paramName + index++));
                     whereClauses.Add("((select CleanValue from itemvalues where ItemId=Guid and Type=6 and cleanvalue in (" + excludedTags + ")) is null)");
                 }
                 else

Emby.Server.Implementations/HttpServer/HttpListenerHost.cs

@@ -449,7 +449,7 @@ namespace Emby.Server.Implementations.HttpServer
                 if (string.Equals(httpReq.Verb, "OPTIONS", StringComparison.OrdinalIgnoreCase))
                 {
                     httpRes.StatusCode = 200;
-                    foreach(var (key, value) in GetDefaultCorsHeaders(httpReq))
+                    foreach (var (key, value) in GetDefaultCorsHeaders(httpReq))
                     {
                         httpRes.Headers.Add(key, value);
                     }
@@ -486,7 +486,7 @@ namespace Emby.Server.Implementations.HttpServer
                 var handler = GetServiceHandler(httpReq);
                 if (handler != null)
                 {
-                    await handler.ProcessRequestAsync(this, httpReq, httpRes, _logger, cancellationToken).ConfigureAwait(false);
+                    await handler.ProcessRequestAsync(this, httpReq, httpRes, cancellationToken).ConfigureAwait(false);
                 }
                 else
                 {

Emby.Server.Implementations/IO/FileRefresher.cs

@@ -21,6 +21,7 @@ namespace Emby.Server.Implementations.IO
         private readonly List<string> _affectedPaths = new List<string>();
         private readonly object _timerLock = new object();
         private Timer _timer;
+        private bool _disposed;
 
         public FileRefresher(string path, IServerConfigurationManager configurationManager, ILibraryManager libraryManager, ILogger logger)
         {
@@ -213,11 +214,11 @@ namespace Emby.Server.Implementations.IO
             }
         }
 
-        private bool _disposed;
         public void Dispose()
         {
             _disposed = true;
             DisposeTimer();
+            GC.SuppressFinalize(this);
         }
     }
 }

Emby.Server.Implementations/Library/MediaSourceManager.cs

@@ -46,8 +46,6 @@ namespace Emby.Server.Implementations.Library
         private readonly Dictionary<string, ILiveStream> _openStreams = new Dictionary<string, ILiveStream>(StringComparer.OrdinalIgnoreCase);
         private readonly SemaphoreSlim _liveStreamSemaphore = new SemaphoreSlim(1, 1);
 
-        private readonly object _disposeLock = new object();
-
         private IMediaSourceProvider[] _providers;
 
         public MediaSourceManager(
@@ -623,12 +621,14 @@ namespace Emby.Server.Implementations.Library
 
             if (liveStreamInfo is IDirectStreamProvider)
             {
-                var info = await _mediaEncoder.GetMediaInfo(new MediaInfoRequest
-                {
-                    MediaSource = mediaSource,
-                    ExtractChapters = false,
-                    MediaType = DlnaProfileType.Video
-                }, cancellationToken).ConfigureAwait(false);
+                var info = await _mediaEncoder.GetMediaInfo(
+                    new MediaInfoRequest
+                    {
+                        MediaSource = mediaSource,
+                        ExtractChapters = false,
+                        MediaType = DlnaProfileType.Video
+                    },
+                    cancellationToken).ConfigureAwait(false);
 
                 mediaSource.MediaStreams = info.MediaStreams;
                 mediaSource.Container = info.Container;
@@ -859,21 +859,21 @@ namespace Emby.Server.Implementations.Library
             }
         }
 
-        private Tuple<IMediaSourceProvider, string> GetProvider(string key)
+        private (IMediaSourceProvider, string) GetProvider(string key)
         {
             if (string.IsNullOrEmpty(key))
             {
-                throw new ArgumentException("key");
+                throw new ArgumentException("Key can't be empty.", nameof(key));
             }
 
             var keys = key.Split(new[] { LiveStreamIdDelimeter }, 2);
 
             var provider = _providers.FirstOrDefault(i => string.Equals(i.GetType().FullName.GetMD5().ToString("N", CultureInfo.InvariantCulture), keys[0], StringComparison.OrdinalIgnoreCase));
 
-            var splitIndex = key.IndexOf(LiveStreamIdDelimeter);
+            var splitIndex = key.IndexOf(LiveStreamIdDelimeter, StringComparison.Ordinal);
             var keyId = key.Substring(splitIndex + 1);
 
-            return new Tuple<IMediaSourceProvider, string>(provider, keyId);
+            return (provider, keyId);
         }
 
         /// <summary>
@@ -893,15 +893,12 @@ namespace Emby.Server.Implementations.Library
         {
             if (dispose)
             {
-                lock (_disposeLock)
+                foreach (var key in _openStreams.Keys.ToList())
                 {
-                    foreach (var key in _openStreams.Keys.ToList())
-                    {
-                        var task = CloseLiveStream(key);
-
-                        Task.WaitAll(task);
-                    }
+                    CloseLiveStream(key).GetAwaiter().GetResult();
                 }
+
+                _liveStreamSemaphore.Dispose();
             }
         }
     }

Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunManager.cs

@@ -77,7 +77,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
         }
     }
 
-    public class HdHomerunManager : IDisposable
+    public sealed class HdHomerunManager : IDisposable
     {
         public const int HdHomeRunPort = 65001;
 
@@ -105,6 +105,8 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                     StopStreaming(socket).GetAwaiter().GetResult();
                 }
             }
+
+            GC.SuppressFinalize(this);
         }
 
         public async Task<bool> CheckTunerAvailability(IPAddress remoteIp, int tuner, CancellationToken cancellationToken)
@@ -162,7 +164,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                     }
 
                     _activeTuner = i;
-                    var lockKeyString = string.Format("{0:d}", lockKeyValue);
+                    var lockKeyString = string.Format(CultureInfo.InvariantCulture, "{0:d}", lockKeyValue);
                     var lockkeyMsg = CreateSetMessage(i, "lockkey", lockKeyString, null);
                     await stream.WriteAsync(lockkeyMsg, 0, lockkeyMsg.Length, cancellationToken).ConfigureAwait(false);
                     int receivedBytes = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false);
@@ -173,8 +175,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                         continue;
                     }
 
-                    var commandList = commands.GetCommands();
-                    foreach (var command in commandList)
+                    foreach (var command in commands.GetCommands())
                     {
                         var channelMsg = CreateSetMessage(i, command.Item1, command.Item2, lockKeyValue);
                         await stream.WriteAsync(channelMsg, 0, channelMsg.Length, cancellationToken).ConfigureAwait(false);
@@ -188,7 +189,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                         }
                     }
 
-                    var targetValue = string.Format("rtp://{0}:{1}", localIp, localPort);
+                    var targetValue = string.Format(CultureInfo.InvariantCulture, "rtp://{0}:{1}", localIp, localPort);
                     var targetMsg = CreateSetMessage(i, "target", targetValue, lockKeyValue);
 
                     await stream.WriteAsync(targetMsg, 0, targetMsg.Length, cancellationToken).ConfigureAwait(false);

Emby.Server.Implementations/Net/UdpSocket.cs

@@ -15,13 +15,11 @@ namespace Emby.Server.Implementations.Net
     public sealed class UdpSocket : ISocket, IDisposable
     {
         private Socket _socket;
-        private int _localPort;
+        private readonly int _localPort;
         private bool _disposed = false;
 
         public Socket Socket => _socket;
 
-        public IPAddress LocalIPAddress { get; }
-
         private readonly SocketAsyncEventArgs _receiveSocketAsyncEventArgs = new SocketAsyncEventArgs()
         {
             SocketFlags = SocketFlags.None
@@ -51,18 +49,33 @@ namespace Emby.Server.Implementations.Net
             InitReceiveSocketAsyncEventArgs();
         }
 
+        public UdpSocket(Socket socket, IPEndPoint endPoint)
+        {
+            if (socket == null)
+            {
+                throw new ArgumentNullException(nameof(socket));
+            }
+
+            _socket = socket;
+            _socket.Connect(endPoint);
+
+            InitReceiveSocketAsyncEventArgs();
+        }
+
+        public IPAddress LocalIPAddress { get; }
+
         private void InitReceiveSocketAsyncEventArgs()
         {
             var receiveBuffer = new byte[8192];
             _receiveSocketAsyncEventArgs.SetBuffer(receiveBuffer, 0, receiveBuffer.Length);
-            _receiveSocketAsyncEventArgs.Completed += _receiveSocketAsyncEventArgs_Completed;
+            _receiveSocketAsyncEventArgs.Completed += OnReceiveSocketAsyncEventArgsCompleted;
 
             var sendBuffer = new byte[8192];
             _sendSocketAsyncEventArgs.SetBuffer(sendBuffer, 0, sendBuffer.Length);
-            _sendSocketAsyncEventArgs.Completed += _sendSocketAsyncEventArgs_Completed;
+            _sendSocketAsyncEventArgs.Completed += OnSendSocketAsyncEventArgsCompleted;
         }
 
-        private void _receiveSocketAsyncEventArgs_Completed(object sender, SocketAsyncEventArgs e)
+        private void OnReceiveSocketAsyncEventArgsCompleted(object sender, SocketAsyncEventArgs e)
         {
             var tcs = _currentReceiveTaskCompletionSource;
             if (tcs != null)
@@ -86,7 +99,7 @@ namespace Emby.Server.Implementations.Net
             }
         }
 
-        private void _sendSocketAsyncEventArgs_Completed(object sender, SocketAsyncEventArgs e)
+        private void OnSendSocketAsyncEventArgsCompleted(object sender, SocketAsyncEventArgs e)
         {
             var tcs = _currentSendTaskCompletionSource;
             if (tcs != null)
@@ -104,19 +117,6 @@ namespace Emby.Server.Implementations.Net
             }
         }
 
-        public UdpSocket(Socket socket, IPEndPoint endPoint)
-        {
-            if (socket == null)
-            {
-                throw new ArgumentNullException(nameof(socket));
-            }
-
-            _socket = socket;
-            _socket.Connect(endPoint);
-
-            InitReceiveSocketAsyncEventArgs();
-        }
-
         public IAsyncResult BeginReceive(byte[] buffer, int offset, int count, AsyncCallback callback)
         {
             ThrowIfDisposed();
@@ -247,6 +247,7 @@ namespace Emby.Server.Implementations.Net
             }
         }
 
+        /// <inheritdoc />
         public void Dispose()
         {
             if (_disposed)
@@ -255,6 +256,8 @@ namespace Emby.Server.Implementations.Net
             }
 
             _socket?.Dispose();
+            _receiveSocketAsyncEventArgs.Dispose();
+            _sendSocketAsyncEventArgs.Dispose();
             _currentReceiveTaskCompletionSource?.TrySetCanceled();
             _currentSendTaskCompletionSource?.TrySetCanceled();
 

Emby.Server.Implementations/Playlists/PlaylistManager.cs

@@ -349,16 +349,14 @@ namespace Emby.Server.Implementations.Playlists
                         AlbumTitle = child.Album
                     };
 
-                    var hasAlbumArtist = child as IHasAlbumArtist;
-                    if (hasAlbumArtist != null)
+                    if (child is IHasAlbumArtist hasAlbumArtist)
                     {
-                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.FirstOrDefault();
+                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.Count > 0 ? hasAlbumArtist.AlbumArtists[0] : null;
                     }
 
-                    var hasArtist = child as IHasArtist;
-                    if (hasArtist != null)
+                    if (child is IHasArtist hasArtist)
                     {
-                        entry.TrackArtist = hasArtist.Artists.FirstOrDefault();
+                        entry.TrackArtist = hasArtist.Artists.Count > 0 ? hasArtist.Artists[0] : null;
                     }
 
                     if (child.RunTimeTicks.HasValue)
@@ -385,16 +383,14 @@ namespace Emby.Server.Implementations.Playlists
                         AlbumTitle = child.Album
                     };
 
-                    var hasAlbumArtist = child as IHasAlbumArtist;
-                    if (hasAlbumArtist != null)
+                    if (child is IHasAlbumArtist hasAlbumArtist)
                     {
-                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.FirstOrDefault();
+                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.Count > 0 ? hasAlbumArtist.AlbumArtists[0] : null;
                     }
 
-                    var hasArtist = child as IHasArtist;
-                    if (hasArtist != null)
+                    if (child is IHasArtist hasArtist)
                     {
-                        entry.TrackArtist = hasArtist.Artists.FirstOrDefault();
+                        entry.TrackArtist = hasArtist.Artists.Count > 0 ? hasArtist.Artists[0] : null;
                     }
 
                     if (child.RunTimeTicks.HasValue)
@@ -411,8 +407,10 @@ namespace Emby.Server.Implementations.Playlists
 
             if (string.Equals(".m3u", extension, StringComparison.OrdinalIgnoreCase))
             {
-                var playlist = new M3uPlaylist();
-                playlist.IsExtended = true;
+                var playlist = new M3uPlaylist
+                {
+                    IsExtended = true
+                };
                 foreach (var child in item.GetLinkedChildren())
                 {
                     var entry = new M3uPlaylistEntry()
@@ -422,10 +420,9 @@ namespace Emby.Server.Implementations.Playlists
                         Album = child.Album
                     };
 
-                    var hasAlbumArtist = child as IHasAlbumArtist;
-                    if (hasAlbumArtist != null)
+                    if (child is IHasAlbumArtist hasAlbumArtist)
                     {
-                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.FirstOrDefault();
+                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.Count > 0 ? hasAlbumArtist.AlbumArtists[0] : null;
                     }
 
                     if (child.RunTimeTicks.HasValue)
@@ -453,10 +450,9 @@ namespace Emby.Server.Implementations.Playlists
                         Album = child.Album
                     };
 
-                    var hasAlbumArtist = child as IHasAlbumArtist;
-                    if (hasAlbumArtist != null)
+                    if (child is IHasAlbumArtist hasAlbumArtist)
                     {
-                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.FirstOrDefault();
+                        entry.AlbumArtist = hasAlbumArtist.AlbumArtists.Count > 0 ? hasAlbumArtist.AlbumArtists[0] : null;
                     }
 
                     if (child.RunTimeTicks.HasValue)
@@ -514,7 +510,7 @@ namespace Emby.Server.Implementations.Playlists
 
             if (!folderPath.EndsWith(Path.DirectorySeparatorChar))
             {
-                folderPath = folderPath + Path.DirectorySeparatorChar;
+                folderPath += Path.DirectorySeparatorChar;
             }
 
             var folderUri = new Uri(folderPath);
@@ -537,32 +533,12 @@ namespace Emby.Server.Implementations.Playlists
             return relativePath;
         }
 
-        private static string UnEscape(string content)
-        {
-            if (content == null)
-            {
-                return content;
-            }
-
-            return content.Replace("&amp;", "&").Replace("&apos;", "'").Replace("&quot;", "\"").Replace("&gt;", ">").Replace("&lt;", "<");
-        }
-
-        private static string Escape(string content)
-        {
-            if (content == null)
-            {
-                return null;
-            }
-
-            return content.Replace("&", "&amp;").Replace("'", "&apos;").Replace("\"", "&quot;").Replace(">", "&gt;").Replace("<", "&lt;");
-        }
-
         public Folder GetPlaylistsFolder(Guid userId)
         {
-            var typeName = "PlaylistsFolder";
+            const string TypeName = "PlaylistsFolder";
 
-            return _libraryManager.RootFolder.Children.OfType<Folder>().FirstOrDefault(i => string.Equals(i.GetType().Name, typeName, StringComparison.Ordinal)) ??
-                _libraryManager.GetUserRootFolder().Children.OfType<Folder>().FirstOrDefault(i => string.Equals(i.GetType().Name, typeName, StringComparison.Ordinal));
+            return _libraryManager.RootFolder.Children.OfType<Folder>().FirstOrDefault(i => string.Equals(i.GetType().Name, TypeName, StringComparison.Ordinal)) ??
+                _libraryManager.GetUserRootFolder().Children.OfType<Folder>().FirstOrDefault(i => string.Equals(i.GetType().Name, TypeName, StringComparison.Ordinal));
         }
     }
 }

Emby.Server.Implementations/Services/ServiceController.cs

@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Threading.Tasks;
 using Emby.Server.Implementations.HttpServer;
 using MediaBrowser.Model.Services;
@@ -91,12 +92,22 @@ namespace Emby.Server.Implementations.Services
         {
             if (restPath.Path[0] != '/')
             {
-                throw new ArgumentException(string.Format("Route '{0}' on '{1}' must start with a '/'", restPath.Path, restPath.RequestType.GetMethodName()));
+                throw new ArgumentException(
+                    string.Format(
+                        CultureInfo.InvariantCulture,
+                        "Route '{0}' on '{1}' must start with a '/'",
+                        restPath.Path,
+                        restPath.RequestType.GetMethodName()));
             }
 
             if (restPath.Path.IndexOfAny(InvalidRouteChars) != -1)
             {
-                throw new ArgumentException(string.Format("Route '{0}' on '{1}' contains invalid chars. ", restPath.Path, restPath.RequestType.GetMethodName()));
+                throw new ArgumentException(
+                    string.Format(
+                        CultureInfo.InvariantCulture,
+                        "Route '{0}' on '{1}' contains invalid chars. ",
+                        restPath.Path,
+                        restPath.RequestType.GetMethodName()));
             }
 
             if (RestPathMap.TryGetValue(restPath.FirstMatchHashKey, out List<RestPath> pathsAtFirstMatch))
@@ -179,8 +190,7 @@ namespace Emby.Server.Implementations.Services
 
             var service = httpHost.CreateInstance(serviceType);
 
-            var serviceRequiresContext = service as IRequiresRequest;
-            if (serviceRequiresContext != null)
+            if (service is IRequiresRequest serviceRequiresContext)
             {
                 serviceRequiresContext.Request = req;
             }

Emby.Server.Implementations/Services/ServiceHandler.cs

@@ -67,7 +67,7 @@ namespace Emby.Server.Implementations.Services
             }
         }
 
-        public async Task ProcessRequestAsync(HttpListenerHost httpHost, IRequest httpReq, HttpResponse httpRes, ILogger logger, CancellationToken cancellationToken)
+        public async Task ProcessRequestAsync(HttpListenerHost httpHost, IRequest httpReq, HttpResponse httpRes, CancellationToken cancellationToken)
         {
             httpReq.Items["__route"] = _restPath;
 
@@ -76,10 +76,10 @@ namespace Emby.Server.Implementations.Services
                 httpReq.ResponseContentType = _responseContentType;
             }
 
-            var request = await CreateRequest(httpHost, httpReq, _restPath, logger).ConfigureAwait(false);
+            var request = await CreateRequest(httpHost, httpReq, _restPath).ConfigureAwait(false);
 
             httpHost.ApplyRequestFilters(httpReq, httpRes, request);
-            
+
             httpRes.HttpContext.SetServiceStackRequest(httpReq);
             var response = await httpHost.ServiceController.Execute(httpHost, request, httpReq).ConfigureAwait(false);
 
@@ -92,7 +92,7 @@ namespace Emby.Server.Implementations.Services
             await ResponseHelper.WriteToResponse(httpRes, httpReq, response, cancellationToken).ConfigureAwait(false);
         }
 
-        public static async Task<object> CreateRequest(HttpListenerHost host, IRequest httpReq, RestPath restPath, ILogger logger)
+        public static async Task<object> CreateRequest(HttpListenerHost host, IRequest httpReq, RestPath restPath)
         {
             var requestType = restPath.RequestType;
 

Emby.Server.Implementations/Session/SessionManager.cs

@@ -848,8 +848,8 @@ namespace Emby.Server.Implementations.Session
         /// </summary>
         /// <param name="info">The info.</param>
         /// <returns>Task.</returns>
-        /// <exception cref="ArgumentNullException">info</exception>
-        /// <exception cref="ArgumentOutOfRangeException">positionTicks</exception>
+        /// <exception cref="ArgumentNullException"><c>info</c> is <c>null</c>.</exception>
+        /// <exception cref="ArgumentOutOfRangeException"><c>info.PositionTicks</c> is <c>null</c> or negative.</exception>
         public async Task OnPlaybackStopped(PlaybackStopInfo info)
         {
             CheckDisposed();

Emby.Server.Implementations/Session/SessionWebSocketListener.cs

@@ -93,7 +93,7 @@ namespace Emby.Server.Implementations.Session
             if (session != null)
             {
                 EnsureController(session, e.Argument);
-                await KeepAliveWebSocket(e.Argument);
+                await KeepAliveWebSocket(e.Argument).ConfigureAwait(false);
             }
             else
             {
@@ -177,7 +177,7 @@ namespace Emby.Server.Implementations.Session
             // Notify WebSocket about timeout
             try
             {
-                await SendForceKeepAlive(webSocket);
+                await SendForceKeepAlive(webSocket).ConfigureAwait(false);
             }
             catch (WebSocketException exception)
             {
@@ -233,6 +233,7 @@ namespace Emby.Server.Implementations.Session
                 if (_keepAliveCancellationToken != null)
                 {
                     _keepAliveCancellationToken.Cancel();
+                    _keepAliveCancellationToken.Dispose();
                     _keepAliveCancellationToken = null;
                 }
             }
@@ -268,7 +269,7 @@ namespace Emby.Server.Implementations.Session
                 lost = _webSockets.Where(i => (DateTime.UtcNow - i.LastKeepAliveDate).TotalSeconds >= WebSocketLostTimeout).ToList();
             }
 
-            if (inactive.Any())
+            if (inactive.Count > 0)
             {
                 _logger.LogInformation("Sending ForceKeepAlive message to {0} inactive WebSockets.", inactive.Count);
             }
@@ -277,7 +278,7 @@ namespace Emby.Server.Implementations.Session
             {
                 try
                 {
-                    await SendForceKeepAlive(webSocket);
+                    await SendForceKeepAlive(webSocket).ConfigureAwait(false);
                 }
                 catch (WebSocketException exception)
                 {
@@ -288,7 +289,7 @@ namespace Emby.Server.Implementations.Session
 
             lock (_webSocketsLock)
             {
-                if (lost.Any())
+                if (lost.Count > 0)
                 {
                     _logger.LogInformation("Lost {0} WebSockets.", lost.Count);
                     foreach (var webSocket in lost)
@@ -298,7 +299,7 @@ namespace Emby.Server.Implementations.Session
                     }
                 }
 
-                if (!_webSockets.Any())
+                if (_webSockets.Count == 0)
                 {
                     StopKeepAlive();
                 }
@@ -312,11 +313,13 @@ namespace Emby.Server.Implementations.Session
         /// <returns>Task.</returns>
         private Task SendForceKeepAlive(IWebSocketConnection webSocket)
         {
-            return webSocket.SendAsync(new WebSocketMessage<int>
-            {
-                MessageType = "ForceKeepAlive",
-                Data = WebSocketLostTimeout
-            }, CancellationToken.None);
+            return webSocket.SendAsync(
+                new WebSocketMessage<int>
+                {
+                    MessageType = "ForceKeepAlive",
+                    Data = WebSocketLostTimeout
+                },
+                CancellationToken.None);
         }
 
         /// <summary>
@@ -330,12 +333,11 @@ namespace Emby.Server.Implementations.Session
         {
             while (!cancellationToken.IsCancellationRequested)
             {
-                await callback();
-                Task task = Task.Delay(interval, cancellationToken);
+                await callback().ConfigureAwait(false);
 
                 try
                 {
-                    await task;
+                    await Task.Delay(interval, cancellationToken).ConfigureAwait(false);
                 }
                 catch (TaskCanceledException)
                 {

Emby.Server.Implementations/Sorting/AiredEpisodeOrderComparer.cs

@@ -154,8 +154,8 @@ namespace Emby.Server.Implementations.Sorting
 
         private static int CompareEpisodes(Episode x, Episode y)
         {
-            var xValue = (x.ParentIndexNumber ?? -1) * 1000 + (x.IndexNumber ?? -1);
-            var yValue = (y.ParentIndexNumber ?? -1) * 1000 + (y.IndexNumber ?? -1);
+            var xValue = ((x.ParentIndexNumber ?? -1) * 1000) + (x.IndexNumber ?? -1);
+            var yValue = ((y.ParentIndexNumber ?? -1) * 1000) + (y.IndexNumber ?? -1);
 
             return xValue.CompareTo(yValue);
         }

Emby.Server.Implementations/SyncPlay/SyncPlayController.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -27,14 +28,17 @@ namespace Emby.Server.Implementations.SyncPlay
             /// All sessions will receive the message.
             /// </summary>
             AllGroup = 0,
+
             /// <summary>
             /// Only the specified session will receive the message.
             /// </summary>
             CurrentSession = 1,
+
             /// <summary>
             /// All sessions, except the current one, will receive the message.
             /// </summary>
             AllExceptCurrentSession = 2,
+
             /// <summary>
             /// Only sessions that are not buffering will receive the message.
             /// </summary>
@@ -56,15 +60,6 @@ namespace Emby.Server.Implementations.SyncPlay
         /// </summary>
         private readonly GroupInfo _group = new GroupInfo();
 
-        /// <inheritdoc />
-        public Guid GetGroupId() => _group.GroupId;
-
-        /// <inheritdoc />
-        public Guid GetPlayingItemId() => _group.PlayingItem.Id;
-
-        /// <inheritdoc />
-        public bool IsGroupEmpty() => _group.IsEmpty();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="SyncPlayController" /> class.
         /// </summary>
@@ -78,6 +73,15 @@ namespace Emby.Server.Implementations.SyncPlay
             _syncPlayManager = syncPlayManager;
         }
 
+        /// <inheritdoc />
+        public Guid GetGroupId() => _group.GroupId;
+
+        /// <inheritdoc />
+        public Guid GetPlayingItemId() => _group.PlayingItem.Id;
+
+        /// <inheritdoc />
+        public bool IsGroupEmpty() => _group.IsEmpty();
+
         /// <summary>
         /// Converts DateTime to UTC string.
         /// </summary>
@@ -85,7 +89,7 @@ namespace Emby.Server.Implementations.SyncPlay
         /// <value>The UTC string.</value>
         private string DateToUTCString(DateTime date)
         {
-            return date.ToUniversalTime().ToString("o");
+            return date.ToUniversalTime().ToString("o", CultureInfo.InvariantCulture);
         }
 
         /// <summary>
@@ -94,23 +98,23 @@ namespace Emby.Server.Implementations.SyncPlay
         /// <param name="from">The current session.</param>
         /// <param name="type">The filtering type.</param>
         /// <value>The array of sessions matching the filter.</value>
-        private SessionInfo[] FilterSessions(SessionInfo from, BroadcastType type)
+        private IEnumerable<SessionInfo> FilterSessions(SessionInfo from, BroadcastType type)
         {
             switch (type)
             {
                 case BroadcastType.CurrentSession:
                     return new SessionInfo[] { from };
                 case BroadcastType.AllGroup:
-                    return _group.Participants.Values.Select(
-                        session => session.Session).ToArray();
+                    return _group.Participants.Values
+                        .Select(session => session.Session);
                 case BroadcastType.AllExceptCurrentSession:
-                    return _group.Participants.Values.Select(
-                        session => session.Session).Where(
-                        session => !session.Id.Equals(from.Id)).ToArray();
+                    return _group.Participants.Values
+                        .Select(session => session.Session)
+                        .Where(session => !session.Id.Equals(from.Id, StringComparison.Ordinal));
                 case BroadcastType.AllReady:
-                    return _group.Participants.Values.Where(
-                        session => !session.IsBuffering).Select(
-                        session => session.Session).ToArray();
+                    return _group.Participants.Values
+                        .Where(session => !session.IsBuffering)
+                        .Select(session => session.Session);
                 default:
                     return Array.Empty<SessionInfo>();
             }
@@ -128,10 +132,9 @@ namespace Emby.Server.Implementations.SyncPlay
         {
             IEnumerable<Task> GetTasks()
             {
-                SessionInfo[] sessions = FilterSessions(from, type);
-                foreach (var session in sessions)
+                foreach (var session in FilterSessions(from, type))
                 {
-                    yield return _sessionManager.SendSyncPlayGroupUpdate(session.Id.ToString(), message, cancellationToken);
+                    yield return _sessionManager.SendSyncPlayGroupUpdate(session.Id, message, cancellationToken);
                 }
             }
 
@@ -150,10 +153,9 @@ namespace Emby.Server.Implementations.SyncPlay
         {
             IEnumerable<Task> GetTasks()
             {
-                SessionInfo[] sessions = FilterSessions(from, type);
-                foreach (var session in sessions)
+                foreach (var session in FilterSessions(from, type))
                 {
-                    yield return _sessionManager.SendSyncPlayCommand(session.Id.ToString(), message, cancellationToken);
+                    yield return _sessionManager.SendSyncPlayCommand(session.Id, message, cancellationToken);
                 }
             }
 
@@ -236,9 +238,11 @@ namespace Emby.Server.Implementations.SyncPlay
             }
             else
             {
-                var playRequest = new PlayRequest();
-                playRequest.ItemIds = new Guid[] { _group.PlayingItem.Id };
-                playRequest.StartPositionTicks = _group.PositionTicks;
+                var playRequest = new PlayRequest
+                {
+                    ItemIds = new Guid[] { _group.PlayingItem.Id },
+                    StartPositionTicks = _group.PositionTicks
+                };
                 var update = NewSyncPlayGroupUpdate(GroupUpdateType.PrepareSession, playRequest);
                 SendGroupUpdate(session, BroadcastType.CurrentSession, update, cancellationToken);
             }