Fix some warnings

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -25,6 +25,11 @@ namespace Emby.Server.Implementations.AppBase
 
         private readonly ConcurrentDictionary<string, object> _configurations = new ConcurrentDictionary<string, object>();
 
+        /// <summary>
+        /// The _configuration sync lock.
+        /// </summary>
+        private readonly object _configurationSyncLock = new object();
+
         private ConfigurationStore[] _configurationStores = Array.Empty<ConfigurationStore>();
         private IConfigurationFactory[] _configurationFactories = Array.Empty<IConfigurationFactory>();
 
@@ -33,11 +38,6 @@ namespace Emby.Server.Implementations.AppBase
         /// </summary>
         private bool _configurationLoaded;
 
-        /// <summary>
-        /// The _configuration sync lock.
-        /// </summary>
-        private readonly object _configurationSyncLock = new object();
-
         /// <summary>
         /// The _configuration.
         /// </summary>

Emby.Server.Implementations/AppBase/ConfigurationHelper.cs

@@ -33,7 +33,8 @@ namespace Emby.Server.Implementations.AppBase
             }
             catch (Exception)
             {
-                configuration = Activator.CreateInstance(type) ?? throw new ArgumentException($"Provided path ({type}) is not valid.", nameof(type));
+                // Note: CreateInstance returns null for Nullable<T>, e.g. CreateInstance(typeof(int?)) returns null.
+                configuration = Activator.CreateInstance(type)!;
             }
 
             using var stream = new MemoryStream(buffer?.Length ?? 0);

Emby.Server.Implementations/EntryPoints/UdpServerEntryPoint.cs

@@ -54,8 +54,8 @@ namespace Emby.Server.Implementations.EntryPoints
 
             try
             {
-                _udpServer = new UdpServer(_logger, _appHost, _config);
+                _udpServer = new UdpServer(_logger, _appHost, _config, PortNumber);
-                _udpServer.Start(PortNumber, _cancellationTokenSource.Token);
+                _udpServer.Start(_cancellationTokenSource.Token);
             }
             catch (SocketException ex)
             {

Emby.Server.Implementations/EntryPoints/UserDataChangeNotifier.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -28,7 +26,7 @@ namespace Emby.Server.Implementations.EntryPoints
         private readonly Dictionary<Guid, List<BaseItem>> _changedItems = new Dictionary<Guid, List<BaseItem>>();
 
         private readonly object _syncLock = new object();
-        private Timer _updateTimer;
+        private Timer? _updateTimer;
 
         public UserDataChangeNotifier(IUserDataManager userDataManager, ISessionManager sessionManager, IUserManager userManager)
         {
@@ -44,7 +42,7 @@ namespace Emby.Server.Implementations.EntryPoints
             return Task.CompletedTask;
         }
 
-        void OnUserDataManagerUserDataSaved(object sender, UserDataSaveEventArgs e)
+        private void OnUserDataManagerUserDataSaved(object? sender, UserDataSaveEventArgs e)
         {
             if (e.SaveReason == UserDataSaveReason.PlaybackProgress)
             {
@@ -66,7 +64,7 @@ namespace Emby.Server.Implementations.EntryPoints
                     _updateTimer.Change(UpdateDuration, Timeout.Infinite);
                 }
 
-                if (!_changedItems.TryGetValue(e.UserId, out List<BaseItem> keys))
+                if (!_changedItems.TryGetValue(e.UserId, out List<BaseItem>? keys))
                 {
                     keys = new List<BaseItem>();
                     _changedItems[e.UserId] = keys;
@@ -89,7 +87,7 @@ namespace Emby.Server.Implementations.EntryPoints
             }
         }
 
-        private void UpdateTimerCallback(object state)
+        private void UpdateTimerCallback(object? state)
         {
             lock (_syncLock)
             {

Emby.Server.Implementations/LiveTv/EmbyTV/RecordingHelper.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;

Emby.Server.Implementations/LiveTv/LiveTvConfigurationFactory.cs

@@ -1,21 +1,23 @@
-#pragma warning disable CS1591
-
 using System.Collections.Generic;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Model.LiveTv;
 
 namespace Emby.Server.Implementations.LiveTv
 {
+    /// <summary>
+    /// <see cref="IConfigurationFactory" /> implementation for <see cref="LiveTvOptions" />.
+    /// </summary>
     public class LiveTvConfigurationFactory : IConfigurationFactory
     {
+        /// <inheritdoc />
         public IEnumerable<ConfigurationStore> GetConfigurations()
         {
             return new ConfigurationStore[]
             {
                 new ConfigurationStore
                 {
-                     ConfigurationType = typeof(LiveTvOptions),
+                    ConfigurationType = typeof(LiveTvOptions),
-                     Key = "livetv"
+                    Key = "livetv"
                 }
             };
         }

Emby.Server.Implementations/LiveTv/LiveTvManager.cs

@@ -2266,7 +2266,7 @@ namespace Emby.Server.Implementations.LiveTv
 
             if (dataSourceChanged)
             {
-                _taskManager.CancelIfRunningAndQueue<RefreshChannelsScheduledTask>();
+                _taskManager.CancelIfRunningAndQueue<RefreshGuideScheduledTask>();
             }
 
             return info;
@@ -2309,7 +2309,7 @@ namespace Emby.Server.Implementations.LiveTv
 
             _config.SaveConfiguration("livetv", config);
 
-            _taskManager.CancelIfRunningAndQueue<RefreshChannelsScheduledTask>();
+            _taskManager.CancelIfRunningAndQueue<RefreshGuideScheduledTask>();
 
             return info;
         }
@@ -2321,7 +2321,7 @@ namespace Emby.Server.Implementations.LiveTv
             config.ListingProviders = config.ListingProviders.Where(i => !string.Equals(id, i.Id, StringComparison.OrdinalIgnoreCase)).ToArray();
 
             _config.SaveConfiguration("livetv", config);
-            _taskManager.CancelIfRunningAndQueue<RefreshChannelsScheduledTask>();
+            _taskManager.CancelIfRunningAndQueue<RefreshGuideScheduledTask>();
         }
 
         public async Task<TunerChannelMapping> SetChannelMapping(string providerId, string tunerChannelId, string providerChannelId)
@@ -2355,7 +2355,7 @@ namespace Emby.Server.Implementations.LiveTv
             var tunerChannelMappings =
                 tunerChannels.Select(i => GetTunerChannelMapping(i, mappings, providerChannels)).ToList();
 
-            _taskManager.CancelIfRunningAndQueue<RefreshChannelsScheduledTask>();
+            _taskManager.CancelIfRunningAndQueue<RefreshGuideScheduledTask>();
 
             return tunerChannelMappings.First(i => string.Equals(i.Id, tunerChannelId, StringComparison.OrdinalIgnoreCase));
         }

Emby.Server.Implementations/LiveTv/RefreshGuideScheduledTask.cs

@@ -1,7 +1,6 @@
-#pragma warning disable CS1591
-
 using System;
 using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Controller.LiveTv;
@@ -10,34 +9,55 @@ using MediaBrowser.Model.Tasks;
 
 namespace Emby.Server.Implementations.LiveTv
 {
-    public class RefreshChannelsScheduledTask : IScheduledTask, IConfigurableScheduledTask
+    /// <summary>
+    /// The "Refresh Guide" scheduled task.
+    /// </summary>
+    public class RefreshGuideScheduledTask : IScheduledTask, IConfigurableScheduledTask
     {
         private readonly ILiveTvManager _liveTvManager;
         private readonly IConfigurationManager _config;
 
-        public RefreshChannelsScheduledTask(ILiveTvManager liveTvManager, IConfigurationManager config)
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RefreshGuideScheduledTask"/> class.
+        /// </summary>
+        /// <param name="liveTvManager">The live tv manager.</param>
+        /// <param name="config">The configuration manager.</param>
+        public RefreshGuideScheduledTask(ILiveTvManager liveTvManager, IConfigurationManager config)
         {
             _liveTvManager = liveTvManager;
             _config = config;
         }
 
+        /// <inheritdoc />
         public string Name => "Refresh Guide";
 
+        /// <inheritdoc />
         public string Description => "Downloads channel information from live tv services.";
 
+        /// <inheritdoc />
         public string Category => "Live TV";
 
-        public Task Execute(System.Threading.CancellationToken cancellationToken, IProgress<double> progress)
+        /// <inheritdoc />
+        public bool IsHidden => _liveTvManager.Services.Count == 1 && GetConfiguration().TunerHosts.Length == 0;
+
+        /// <inheritdoc />
+        public bool IsEnabled => true;
+
+        /// <inheritdoc />
+        public bool IsLogged => true;
+
+        /// <inheritdoc />
+        public string Key => "RefreshGuide";
+
+        /// <inheritdoc />
+        public Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
         {
             var manager = (LiveTvManager)_liveTvManager;
 
             return manager.RefreshChannels(progress, cancellationToken);
         }
 
-        /// <summary>
+        /// <inheritdoc />
-        /// Creates the triggers that define when the task will run.
-        /// </summary>
-        /// <returns>IEnumerable{BaseTaskTrigger}.</returns>
         public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
         {
             return new[]
@@ -51,13 +71,5 @@ namespace Emby.Server.Implementations.LiveTv
         {
             return _config.GetConfiguration<LiveTvOptions>("livetv");
         }
-
-        public bool IsHidden => _liveTvManager.Services.Count == 1 && GetConfiguration().TunerHosts.Length == 0;
-
-        public bool IsEnabled => true;
-
-        public bool IsLogged => true;
-
-        public string Key => "RefreshGuide";
     }
 }

Emby.Server.Implementations/LiveTv/TunerHosts/BaseTunerHost.cs

@@ -40,6 +40,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
         public virtual bool IsSupported => true;
 
         protected abstract Task<List<ChannelInfo>> GetChannelsInternal(TunerHostInfo tuner, CancellationToken cancellationToken);
+
         public abstract string Type { get; }
 
         public async Task<List<ChannelInfo>> GetChannels(TunerHostInfo tuner, bool enableCache, CancellationToken cancellationToken)

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

@@ -583,7 +583,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                     Logger,
                     Config,
                     _appHost,
-                    _networkManager,
                     _streamHelper);
             }
 
@@ -624,7 +623,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                 Logger,
                 Config,
                 _appHost,
-                _networkManager,
                 _streamHelper);
         }
 

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

@@ -12,7 +12,6 @@ using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Common.Configuration;
-using MediaBrowser.Common.Net;
 using MediaBrowser.Controller;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Model.Dto;
@@ -30,7 +29,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
         private readonly IServerApplicationHost _appHost;
         private readonly IHdHomerunChannelCommands _channelCommands;
         private readonly int _numTuners;
-        private readonly INetworkManager _networkManager;
 
         public HdHomerunUdpStream(
             MediaSourceInfo mediaSource,
@@ -42,12 +40,10 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             ILogger logger,
             IConfigurationManager configurationManager,
             IServerApplicationHost appHost,
-            INetworkManager networkManager,
             IStreamHelper streamHelper)
             : base(mediaSource, tunerHostInfo, fileSystem, logger, configurationManager, streamHelper)
         {
             _appHost = appHost;
-            _networkManager = networkManager;
             OriginalStreamId = originalStreamId;
             _channelCommands = channelCommands;
             _numTuners = numTuners;
@@ -128,7 +124,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
                 using (udpClient)
                 using (hdHomerunManager)
                 {
-                    if (!(ex is OperationCanceledException))
+                    if (ex is not OperationCanceledException)
                     {
                         Logger.LogError(ex, "Error opening live stream:");
                     }

Emby.Server.Implementations/LiveTv/TunerHosts/M3UTunerHost.cs

@@ -29,6 +29,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 {
     public class M3UTunerHost : BaseTunerHost, ITunerHost, IConfigurableTunerHost
     {
+        private static readonly string[] _disallowedSharedStreamExtensions =
+        {
+            ".mkv",
+            ".mp4",
+            ".m3u8",
+            ".mpd"
+        };
+
         private readonly IHttpClientFactory _httpClientFactory;
         private readonly IServerApplicationHost _appHost;
         private readonly INetworkManager _networkManager;
@@ -67,7 +75,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
         {
             var channelIdPrefix = GetFullChannelIdPrefix(info);
 
-            return await new M3uParser(Logger, _httpClientFactory, _appHost)
+            return await new M3uParser(Logger, _httpClientFactory)
                 .Parse(info, channelIdPrefix, cancellationToken)
                 .ConfigureAwait(false);
         }
@@ -88,14 +96,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             return Task.FromResult(list);
         }
 
-        private static readonly string[] _disallowedSharedStreamExtensions =
-        {
-            ".mkv",
-            ".mp4",
-            ".m3u8",
-            ".mpd"
-        };
-
         protected override async Task<ILiveStream> GetChannelStream(TunerHostInfo info, ChannelInfo channelInfo, string streamId, List<ILiveStream> currentLiveStreams, CancellationToken cancellationToken)
         {
             var tunerCount = info.TunerCount;
@@ -130,7 +130,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
         public async Task Validate(TunerHostInfo info)
         {
-            using (var stream = await new M3uParser(Logger, _httpClientFactory, _appHost).GetListingsStream(info, CancellationToken.None).ConfigureAwait(false))
+            using (var stream = await new M3uParser(Logger, _httpClientFactory).GetListingsStream(info, CancellationToken.None).ConfigureAwait(false))
             {
             }
         }

Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs

@@ -21,15 +21,15 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 {
     public class M3uParser
     {
+        private const string ExtInfPrefix = "#EXTINF:";
+
         private readonly ILogger _logger;
         private readonly IHttpClientFactory _httpClientFactory;
-        private readonly IServerApplicationHost _appHost;
 
-        public M3uParser(ILogger logger, IHttpClientFactory httpClientFactory, IServerApplicationHost appHost)
+        public M3uParser(ILogger logger, IHttpClientFactory httpClientFactory)
         {
             _logger = logger;
             _httpClientFactory = httpClientFactory;
-            _appHost = appHost;
         }
 
         public async Task<List<ChannelInfo>> Parse(TunerHostInfo info, string channelIdPrefix, CancellationToken cancellationToken)
@@ -61,8 +61,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             return File.OpenRead(info.Url);
         }
 
-        private const string ExtInfPrefix = "#EXTINF:";
-
         private async Task<List<ChannelInfo>> GetChannelsAsync(TextReader reader, string channelIdPrefix, string tunerHostId)
         {
             var channels = new List<ChannelInfo>();

Emby.Server.Implementations/LiveTv/TunerHosts/SharedHttpStream.cs

@@ -91,8 +91,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
             var taskCompletionSource = new TaskCompletionSource<bool>();
 
-            var now = DateTime.UtcNow;
-
             _ = StartStreaming(response, taskCompletionSource, LiveStreamCancellationTokenSource.Token);
 
             // OpenedMediaSource.Protocol = MediaProtocol.File;
@@ -120,7 +118,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             if (!taskCompletionSource.Task.Result)
             {
                 Logger.LogWarning("Zero bytes copied from stream {0} to {1} but no exception raised", GetType().Name, TempFilePath);
-                throw new EndOfStreamException(String.Format(CultureInfo.InvariantCulture, "Zero bytes copied from stream {0}", GetType().Name));
+                throw new EndOfStreamException(string.Format(CultureInfo.InvariantCulture, "Zero bytes copied from stream {0}", GetType().Name));
             }
         }
 

Emby.Server.Implementations/Plugins/PluginManager.cs

@@ -455,7 +455,8 @@ namespace Emby.Server.Implementations.Plugins
             try
             {
                 _logger.LogDebug("Creating instance of {Type}", type);
-                var instance = (IPlugin)ActivatorUtilities.CreateInstance(_appHost.ServiceProvider, type);
+                // _appHost.ServiceProvider is already assigned when we create the plugins
+                var instance = (IPlugin)ActivatorUtilities.CreateInstance(_appHost.ServiceProvider!, type);
                 if (plugin == null)
                 {
                     // Create a dummy record for the providers.

Emby.Server.Implementations/ScheduledTasks/ScheduledTaskWorker.cs

@@ -711,11 +711,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
                     throw new ArgumentException("Info did not contain a TimeOfDayTicks.", nameof(info));
                 }
 
-                return new DailyTrigger
+                return new DailyTrigger(TimeSpan.FromTicks(info.TimeOfDayTicks.Value), options);
-                {
-                    TimeOfDay = TimeSpan.FromTicks(info.TimeOfDayTicks.Value),
-                    TaskOptions = options
-                };
             }
 
             if (info.Type.Equals(nameof(WeeklyTrigger), StringComparison.OrdinalIgnoreCase))
@@ -730,12 +726,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
                     throw new ArgumentException("Info did not contain a DayOfWeek.", nameof(info));
                 }
 
-                return new WeeklyTrigger
+                return new WeeklyTrigger(TimeSpan.FromTicks(info.TimeOfDayTicks.Value), info.DayOfWeek.Value, options);
-                {
-                    TimeOfDay = TimeSpan.FromTicks(info.TimeOfDayTicks.Value),
-                    DayOfWeek = info.DayOfWeek.Value,
-                    TaskOptions = options
-                };
             }
 
             if (info.Type.Equals(nameof(IntervalTrigger), StringComparison.OrdinalIgnoreCase))
@@ -745,16 +736,12 @@ namespace Emby.Server.Implementations.ScheduledTasks
                     throw new ArgumentException("Info did not contain a IntervalTicks.", nameof(info));
                 }
 
-                return new IntervalTrigger
+                return new IntervalTrigger(TimeSpan.FromTicks(info.IntervalTicks.Value), options);
-                {
-                    Interval = TimeSpan.FromTicks(info.IntervalTicks.Value),
-                    TaskOptions = options
-                };
             }
 
             if (info.Type.Equals(nameof(StartupTrigger), StringComparison.OrdinalIgnoreCase))
             {
-                return new StartupTrigger();
+                return new StartupTrigger(options);
             }
 
             throw new ArgumentException("Unrecognized trigger type: " + info.Type);

Emby.Server.Implementations/ScheduledTasks/Triggers/DailyTrigger.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Threading;
 using MediaBrowser.Model.Tasks;
@@ -10,29 +8,31 @@ namespace Emby.Server.Implementations.ScheduledTasks
     /// <summary>
     /// Represents a task trigger that fires everyday.
     /// </summary>
-    public class DailyTrigger : ITaskTrigger
+    public sealed class DailyTrigger : ITaskTrigger
     {
-        /// <summary>
+        private readonly TimeSpan _timeOfDay;
-        /// Occurs when [triggered].
+        private Timer? _timer;
-        /// </summary>
-        public event EventHandler<EventArgs> Triggered;
 
         /// <summary>
-        /// Gets or sets the time of day to trigger the task to run.
+        /// Initializes a new instance of the <see cref="DailyTrigger"/> class.
         /// </summary>
-        /// <value>The time of day.</value>
+        /// <param name="timeofDay">The time of day to trigger the task to run.</param>
-        public TimeSpan TimeOfDay { get; set; }
+        /// <param name="taskOptions">The options of this task.</param>
+        public DailyTrigger(TimeSpan timeofDay, TaskOptions taskOptions)
+        {
+            _timeOfDay = timeofDay;
+            TaskOptions = taskOptions;
+        }
 
         /// <summary>
-        /// Gets or sets the options of this task.
+        /// Occurs when [triggered].
         /// </summary>
-        public TaskOptions TaskOptions { get; set; }
+        public event EventHandler<EventArgs>? Triggered;
 
         /// <summary>
-        /// Gets or sets the timer.
+        /// Gets the options of this task.
         /// </summary>
-        /// <value>The timer.</value>
+        public TaskOptions TaskOptions { get; }
-        private Timer Timer { get; set; }
 
         /// <summary>
         /// Stars waiting for the trigger action.
@@ -47,14 +47,14 @@ namespace Emby.Server.Implementations.ScheduledTasks
 
             var now = DateTime.Now;
 
-            var triggerDate = now.TimeOfDay > TimeOfDay ? now.Date.AddDays(1) : now.Date;
+            var triggerDate = now.TimeOfDay > _timeOfDay ? now.Date.AddDays(1) : now.Date;
-            triggerDate = triggerDate.Add(TimeOfDay);
+            triggerDate = triggerDate.Add(_timeOfDay);
 
             var dueTime = triggerDate - now;
 
             logger.LogInformation("Daily trigger for {Task} set to fire at {TriggerDate:yyyy-MM-dd HH:mm:ss.fff zzz}, which is {DueTime:c} from now.", taskName, triggerDate, dueTime);
 
-            Timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
+            _timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
         }
 
         /// <summary>
@@ -70,10 +70,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
         /// </summary>
         private void DisposeTimer()
         {
-            if (Timer != null)
+            _timer?.Dispose();
-            {
-                Timer.Dispose();
-            }
         }
 
         /// <summary>

Emby.Server.Implementations/ScheduledTasks/Triggers/IntervalTrigger.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Linq;
 using System.Threading;
@@ -11,31 +9,32 @@ namespace Emby.Server.Implementations.ScheduledTasks
     /// <summary>
     /// Represents a task trigger that runs repeatedly on an interval.
     /// </summary>
-    public class IntervalTrigger : ITaskTrigger
+    public sealed class IntervalTrigger : ITaskTrigger
     {
+        private readonly TimeSpan _interval;
         private DateTime _lastStartDate;
+        private Timer? _timer;
 
         /// <summary>
-        /// Occurs when [triggered].
+        /// Initializes a new instance of the <see cref="IntervalTrigger"/> class.
-        /// </summary>
-        public event EventHandler<EventArgs> Triggered;
-
-        /// <summary>
-        /// Gets or sets the interval.
         /// </summary>
-        /// <value>The interval.</value>
+        /// <param name="interval">The interval.</param>
-        public TimeSpan Interval { get; set; }
+        /// <param name="taskOptions">The options of this task.</param>
+        public IntervalTrigger(TimeSpan interval, TaskOptions taskOptions)
+        {
+            _interval = interval;
+            TaskOptions = taskOptions;
+        }
 
         /// <summary>
-        /// Gets or sets the options of this task.
+        /// Occurs when [triggered].
         /// </summary>
-        public TaskOptions TaskOptions { get; set; }
+        public event EventHandler<EventArgs>? Triggered;
 
         /// <summary>
-        /// Gets or sets the timer.
+        /// Gets the options of this task.
         /// </summary>
-        /// <value>The timer.</value>
+        public TaskOptions TaskOptions { get; }
-        private Timer Timer { get; set; }
 
         /// <summary>
         /// Stars waiting for the trigger action.
@@ -57,7 +56,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
             }
             else
             {
-                triggerDate = new[] { lastResult.EndTimeUtc, _lastStartDate }.Max().Add(Interval);
+                triggerDate = new[] { lastResult.EndTimeUtc, _lastStartDate }.Max().Add(_interval);
             }
 
             if (DateTime.UtcNow > triggerDate)
@@ -73,7 +72,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
                 dueTime = maxDueTime;
             }
 
-            Timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
+            _timer = new Timer(state => OnTriggered(), null, dueTime, TimeSpan.FromMilliseconds(-1));
         }
 
         /// <summary>
@@ -89,10 +88,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
         /// </summary>
         private void DisposeTimer()
         {
-            if (Timer != null)
+            _timer?.Dispose();
-            {
-                Timer.Dispose();
-            }
         }
 
         /// <summary>

Emby.Server.Implementations/ScheduledTasks/Triggers/StartupTrigger.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 #pragma warning disable CS1591
 
 using System;
@@ -12,24 +10,28 @@ namespace Emby.Server.Implementations.ScheduledTasks
     /// <summary>
     /// Class StartupTaskTrigger.
     /// </summary>
-    public class StartupTrigger : ITaskTrigger
+    public sealed class StartupTrigger : ITaskTrigger
     {
+        public const int DelayMs = 3000;
+
         /// <summary>
-        /// Occurs when [triggered].
+        /// Initializes a new instance of the <see cref="StartupTrigger"/> class.
         /// </summary>
-        public event EventHandler<EventArgs> Triggered;
+        /// <param name="taskOptions">The options of this task.</param>
-
+        public StartupTrigger(TaskOptions taskOptions)
-        public int DelayMs { get; set; }
+        {
+            TaskOptions = taskOptions;
+        }
 
         /// <summary>
-        /// Gets or sets the options of this task.
+        /// Occurs when [triggered].
         /// </summary>
-        public TaskOptions TaskOptions { get; set; }
+        public event EventHandler<EventArgs>? Triggered;
 
-        public StartupTrigger()
+        /// <summary>
-        {
+        /// Gets the options of this task.
-            DelayMs = 3000;
+        /// </summary>
-        }
+        public TaskOptions TaskOptions { get; }
 
         /// <summary>
         /// Stars waiting for the trigger action.

Emby.Server.Implementations/ScheduledTasks/Triggers/WeeklyTrigger.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Threading;
 using MediaBrowser.Model.Tasks;
@@ -10,35 +8,34 @@ namespace Emby.Server.Implementations.ScheduledTasks
     /// <summary>
     /// Represents a task trigger that fires on a weekly basis.
     /// </summary>
-    public class WeeklyTrigger : ITaskTrigger
+    public sealed class WeeklyTrigger : ITaskTrigger
     {
-        /// <summary>
+        private readonly TimeSpan _timeOfDay;
-        /// Occurs when [triggered].
+        private readonly DayOfWeek _dayOfWeek;
-        /// </summary>
+        private Timer? _timer;
-        public event EventHandler<EventArgs> Triggered;
-
-        /// <summary>
-        /// Gets or sets the time of day to trigger the task to run.
-        /// </summary>
-        /// <value>The time of day.</value>
-        public TimeSpan TimeOfDay { get; set; }
 
         /// <summary>
-        /// Gets or sets the day of week.
+        /// Initializes a new instance of the <see cref="WeeklyTrigger"/> class.
         /// </summary>
-        /// <value>The day of week.</value>
+        /// <param name="timeofDay">The time of day to trigger the task to run.</param>
-        public DayOfWeek DayOfWeek { get; set; }
+        /// <param name="dayOfWeek">The day of week.</param>
+        /// <param name="taskOptions">The options of this task.</param>
+        public WeeklyTrigger(TimeSpan timeofDay, DayOfWeek dayOfWeek, TaskOptions taskOptions)
+        {
+            _timeOfDay = timeofDay;
+            _dayOfWeek = dayOfWeek;
+            TaskOptions = taskOptions;
+        }
 
         /// <summary>
-        /// Gets or sets the options of this task.
+        /// Occurs when [triggered].
         /// </summary>
-        public TaskOptions TaskOptions { get; set; }
+        public event EventHandler<EventArgs>? Triggered;
 
         /// <summary>
-        /// Gets or sets the timer.
+        /// Gets the options of this task.
         /// </summary>
-        /// <value>The timer.</value>
+        public TaskOptions TaskOptions { get; }
-        private Timer Timer { get; set; }
 
         /// <summary>
         /// Stars waiting for the trigger action.
@@ -53,7 +50,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
 
             var triggerDate = GetNextTriggerDateTime();
 
-            Timer = new Timer(state => OnTriggered(), null, triggerDate - DateTime.Now, TimeSpan.FromMilliseconds(-1));
+            _timer = new Timer(state => OnTriggered(), null, triggerDate - DateTime.Now, TimeSpan.FromMilliseconds(-1));
         }
 
         /// <summary>
@@ -65,22 +62,22 @@ namespace Emby.Server.Implementations.ScheduledTasks
             var now = DateTime.Now;
 
             // If it's on the same day
-            if (now.DayOfWeek == DayOfWeek)
+            if (now.DayOfWeek == _dayOfWeek)
             {
                 // It's either later today, or a week from now
-                return now.TimeOfDay < TimeOfDay ? now.Date.Add(TimeOfDay) : now.Date.AddDays(7).Add(TimeOfDay);
+                return now.TimeOfDay < _timeOfDay ? now.Date.Add(_timeOfDay) : now.Date.AddDays(7).Add(_timeOfDay);
             }
 
             var triggerDate = now.Date;
 
             // Walk the date forward until we get to the trigger day
-            while (triggerDate.DayOfWeek != DayOfWeek)
+            while (triggerDate.DayOfWeek != _dayOfWeek)
             {
                 triggerDate = triggerDate.AddDays(1);
             }
 
             // Return the trigger date plus the time offset
-            return triggerDate.Add(TimeOfDay);
+            return triggerDate.Add(_timeOfDay);
         }
 
         /// <summary>
@@ -96,10 +93,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
         /// </summary>
         private void DisposeTimer()
         {
-            if (Timer != null)
+            _timer?.Dispose();
-            {
-                Timer.Dispose();
-            }
         }
 
         /// <summary>

Emby.Server.Implementations/Session/WebSocketController.cs

@@ -1,5 +1,4 @@
 #pragma warning disable CS1591
-#pragma warning disable SA1600
 
 using System;
 using System.Collections.Generic;

Emby.Server.Implementations/Udp/UdpServer.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Net;
 using System.Net.Sockets;
@@ -19,6 +17,11 @@ namespace Emby.Server.Implementations.Udp
     /// </summary>
     public sealed class UdpServer : IDisposable
     {
+        /// <summary>
+        /// Address Override Configuration Key.
+        /// </summary>
+        public const string AddressOverrideConfigKey = "PublishedServerUrl";
+
         /// <summary>
         /// The _logger.
         /// </summary>
@@ -26,11 +29,6 @@ namespace Emby.Server.Implementations.Udp
         private readonly IServerApplicationHost _appHost;
         private readonly IConfiguration _config;
 
-        /// <summary>
-        /// Address Override Configuration Key.
-        /// </summary>
-        public const string AddressOverrideConfigKey = "PublishedServerUrl";
-
         private Socket _udpSocket;
         private IPEndPoint _endpoint;
         private readonly byte[] _receiveBuffer = new byte[8192];
@@ -40,49 +38,58 @@ namespace Emby.Server.Implementations.Udp
         /// <summary>
         /// Initializes a new instance of the <see cref="UdpServer" /> class.
         /// </summary>
-        public UdpServer(ILogger logger, IServerApplicationHost appHost, IConfiguration configuration)
+        /// <param name="logger">The logger.</param>
+        /// <param name="appHost">The application host.</param>
+        /// <param name="configuration">The configuration manager.</param>
+        /// <param name="port">The port.</param>
+        public UdpServer(
+            ILogger logger,
+            IServerApplicationHost appHost,
+            IConfiguration configuration,
+            int port)
         {
             _logger = logger;
             _appHost = appHost;
             _config = configuration;
+
+            _endpoint = new IPEndPoint(IPAddress.Any, port);
+
+            _udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
+            _udpSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
         }
 
         private async Task RespondToV2Message(string messageText, EndPoint endpoint, CancellationToken cancellationToken)
         {
-            string localUrl = !string.IsNullOrEmpty(_config[AddressOverrideConfigKey])
+            string? localUrl = _config[AddressOverrideConfigKey];
-                ? _config[AddressOverrideConfigKey]
+            if (string.IsNullOrEmpty(localUrl))
-                : _appHost.GetSmartApiUrl(((IPEndPoint)endpoint).Address);
+            {
+                localUrl = _appHost.GetSmartApiUrl(((IPEndPoint)endpoint).Address);
+            }
 
-            if (!string.IsNullOrEmpty(localUrl))
+            if (string.IsNullOrEmpty(localUrl))
             {
-                var response = new ServerDiscoveryInfo(localUrl, _appHost.SystemId, _appHost.FriendlyName);
+                _logger.LogWarning("Unable to respond to udp request because the local ip address could not be determined.");
+                return;
+            }
 
-                try
+            var response = new ServerDiscoveryInfo(localUrl, _appHost.SystemId, _appHost.FriendlyName);
-                {
+
-                    await _udpSocket.SendToAsync(JsonSerializer.SerializeToUtf8Bytes(response), SocketFlags.None, endpoint).ConfigureAwait(false);
+            try
-                }
+            {
-                catch (SocketException ex)
+                await _udpSocket.SendToAsync(JsonSerializer.SerializeToUtf8Bytes(response), SocketFlags.None, endpoint).ConfigureAwait(false);
-                {
-                    _logger.LogError(ex, "Error sending response message");
-                }
             }
-            else
+            catch (SocketException ex)
             {
-                _logger.LogWarning("Unable to respond to udp request because the local ip address could not be determined.");
+                _logger.LogError(ex, "Error sending response message");
             }
         }
 
         /// <summary>
         /// Starts the specified port.
         /// </summary>
-        /// <param name="port">The port.</param>
         /// <param name="cancellationToken">The cancellation token to cancel operation.</param>
-        public void Start(int port, CancellationToken cancellationToken)
+        public void Start(CancellationToken cancellationToken)
         {
-            _endpoint = new IPEndPoint(IPAddress.Any, port);
-
-            _udpSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
-            _udpSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
             _udpSocket.Bind(_endpoint);
 
             _ = Task.Run(async () => await BeginReceiveAsync(cancellationToken).ConfigureAwait(false), cancellationToken).ConfigureAwait(false);
@@ -90,9 +97,9 @@ namespace Emby.Server.Implementations.Udp
 
         private async Task BeginReceiveAsync(CancellationToken cancellationToken)
         {
+            var infiniteTask = Task.Delay(-1, cancellationToken);
             while (!cancellationToken.IsCancellationRequested)
             {
-                var infiniteTask = Task.Delay(-1, cancellationToken);
                 try
                 {
                     var task = _udpSocket.ReceiveFromAsync(_receiveBuffer, SocketFlags.None, _endpoint);

Jellyfin.Server.Implementations/Events/EventManager.cs

@@ -43,7 +43,12 @@ namespace Jellyfin.Server.Implementations.Events
         private async Task PublishInternal<T>(T eventArgs)
             where T : EventArgs
         {
-            using var scope = _appHost.ServiceProvider.CreateScope();
+            using var scope = _appHost.ServiceProvider?.CreateScope();
+            if (scope == null)
+            {
+                return;
+            }
+
             foreach (var service in scope.ServiceProvider.GetServices<IEventConsumer<T>>())
             {
                 try

MediaBrowser.Common/IApplicationHost.cs

@@ -1,5 +1,3 @@
-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Reflection;
@@ -12,7 +10,7 @@ namespace MediaBrowser.Common
     /// </summary>
     /// <param name="type">Type to create.</param>
     /// <returns>New instance of type <param>type</param>.</returns>
-    public delegate object CreationDelegateFactory(Type type);
+    public delegate object? CreationDelegateFactory(Type type);
 
     /// <summary>
     /// An interface to be implemented by the applications hosting a kernel.
@@ -22,7 +20,7 @@ namespace MediaBrowser.Common
         /// <summary>
         /// Occurs when [has pending restart changed].
         /// </summary>
-        event EventHandler HasPendingRestartChanged;
+        event EventHandler? HasPendingRestartChanged;
 
         /// <summary>
         /// Gets the name.
@@ -63,7 +61,7 @@ namespace MediaBrowser.Common
         /// <summary>
         /// Gets or sets the service provider.
         /// </summary>
-        IServiceProvider ServiceProvider { get; set; }
+        IServiceProvider? ServiceProvider { get; set; }
 
         /// <summary>
         /// Gets the application version.

MediaBrowser.MediaEncoding/Subtitles/ParserValues.cs

@@ -1,9 +0,0 @@
-#pragma warning disable CS1591
-
-namespace MediaBrowser.MediaEncoding.Subtitles
-{
-    public static class ParserValues
-    {
-        public const string NewLine = "\r\n";
-    }
-}

MediaBrowser.Model/Tasks/ITaskTrigger.cs

@@ -14,9 +14,9 @@ namespace MediaBrowser.Model.Tasks
         event EventHandler<EventArgs>? Triggered;
 
         /// <summary>
-        /// Gets or sets the options of this task.
+        /// Gets the options of this task.
         /// </summary>
-        TaskOptions TaskOptions { get; set; }
+        TaskOptions TaskOptions { get; }
 
         /// <summary>
         /// Stars waiting for the trigger action.

jellyfin.ruleset

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RuleSet Name="Rules for Jellyfin.Server" Description="Code analysis rules for Jellyfin.Server.csproj" ToolsVersion="14.0">
   <Rules AnalyzerId="StyleCop.Analyzers" RuleNamespace="StyleCop.Analyzers">
+    <!-- disable warning CA1040: Avoid empty interfaces -->
+    <Rule Id="CA1040" Action="Info" />
+
     <!-- disable warning SA1009: Closing parenthesis should be followed by a space. -->
     <Rule Id="SA1009" Action="None" />
     <!-- disable warning SA1011: Closing square bracket should be followed by a space. -->