Merge pull request #8511 from Bond-009/isnull

38 files changed, 149 insertions, 149 deletions

diff --git a/Jellyfin.Api/Controllers/ArtistsController.cs b/Jellyfin.Api/Controllers/ArtistsController.cs
index c059cb198a..c8ac2ed526 100644
--- a/Jellyfin.Api/Controllers/ArtistsController.cs
+++ b/Jellyfin.Api/Controllers/ArtistsController.cs
@@ -183,7 +183,7 @@ namespace Jellyfin.Api.Controllers
                     {
                         return null;
                     }
-                }).Where(i => i != null).Select(i => i!.Id).ToArray();
+                }).Where(i => i is not null).Select(i => i!.Id).ToArray();
             }
 
             foreach (var filter in filters)
@@ -386,7 +386,7 @@ namespace Jellyfin.Api.Controllers
                     {
                         return null;
                     }
-                }).Where(i => i != null).Select(i => i!.Id).ToArray();
+                }).Where(i => i is not null).Select(i => i!.Id).ToArray();
             }
 
             foreach (var filter in filters)
diff --git a/Jellyfin.Api/Controllers/ConfigurationController.cs b/Jellyfin.Api/Controllers/ConfigurationController.cs
index bbe1633120..a00ac1b0af 100644
--- a/Jellyfin.Api/Controllers/ConfigurationController.cs
+++ b/Jellyfin.Api/Controllers/ConfigurationController.cs
@@ -96,7 +96,7 @@ namespace Jellyfin.Api.Controllers
             var configurationType = _configurationManager.GetConfigurationType(key);
             var deserializedConfiguration = configuration.Deserialize(configurationType, _serializerOptions);
 
-            if (deserializedConfiguration == null)
+            if (deserializedConfiguration is null)
             {
                 throw new ArgumentException("Body doesn't contain a valid configuration");
             }
diff --git a/Jellyfin.Api/Controllers/DashboardController.cs b/Jellyfin.Api/Controllers/DashboardController.cs
index c8411f44ba..3894e6c5fc 100644
--- a/Jellyfin.Api/Controllers/DashboardController.cs
+++ b/Jellyfin.Api/Controllers/DashboardController.cs
@@ -76,7 +76,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult GetDashboardConfigurationPage([FromQuery] string? name)
         {
             var altPage = GetPluginPages().FirstOrDefault(p => string.Equals(p.Item1.Name, name, StringComparison.OrdinalIgnoreCase));
-            if (altPage == null)
+            if (altPage is null)
             {
                 return NotFound();
             }
@@ -84,7 +84,7 @@ namespace Jellyfin.Api.Controllers
             IPlugin plugin = altPage.Item2;
             string resourcePath = altPage.Item1.EmbeddedResourcePath;
             Stream? stream = plugin.GetType().Assembly.GetManifestResourceStream(resourcePath);
-            if (stream == null)
+            if (stream is null)
             {
                 _logger.LogError("Failed to get resource {Resource} from plugin {Plugin}", resourcePath, plugin.Name);
                 return NotFound();
diff --git a/Jellyfin.Api/Controllers/DevicesController.cs b/Jellyfin.Api/Controllers/DevicesController.cs
index 8292cf83b5..aad60cf5cc 100644
--- a/Jellyfin.Api/Controllers/DevicesController.cs
+++ b/Jellyfin.Api/Controllers/DevicesController.cs
@@ -64,7 +64,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult<DeviceInfo>> GetDeviceInfo([FromQuery, Required] string id)
         {
             var deviceInfo = await _deviceManager.GetDevice(id).ConfigureAwait(false);
-            if (deviceInfo == null)
+            if (deviceInfo is null)
             {
                 return NotFound();
             }
@@ -85,7 +85,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult<DeviceOptions>> GetDeviceOptions([FromQuery, Required] string id)
         {
             var deviceInfo = await _deviceManager.GetDeviceOptions(id).ConfigureAwait(false);
-            if (deviceInfo == null)
+            if (deviceInfo is null)
             {
                 return NotFound();
             }
@@ -123,7 +123,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> DeleteDevice([FromQuery, Required] string id)
         {
             var existingDevice = await _deviceManager.GetDevice(id).ConfigureAwait(false);
-            if (existingDevice == null)
+            if (existingDevice is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/DlnaController.cs b/Jellyfin.Api/Controllers/DlnaController.cs
index 35c3a3d922..07e0590a10 100644
--- a/Jellyfin.Api/Controllers/DlnaController.cs
+++ b/Jellyfin.Api/Controllers/DlnaController.cs
@@ -63,7 +63,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult<DeviceProfile> GetProfile([FromRoute, Required] string profileId)
         {
             var profile = _dlnaManager.GetProfile(profileId);
-            if (profile == null)
+            if (profile is null)
             {
                 return NotFound();
             }
@@ -84,7 +84,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult DeleteProfile([FromRoute, Required] string profileId)
         {
             var existingDeviceProfile = _dlnaManager.GetProfile(profileId);
-            if (existingDeviceProfile == null)
+            if (existingDeviceProfile is null)
             {
                 return NotFound();
             }
@@ -121,7 +121,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult UpdateProfile([FromRoute, Required] string profileId, [FromBody] DeviceProfile deviceProfile)
         {
             var existingDeviceProfile = _dlnaManager.GetProfile(profileId);
-            if (existingDeviceProfile == null)
+            if (existingDeviceProfile is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/DlnaServerController.cs b/Jellyfin.Api/Controllers/DlnaServerController.cs
index 8859d60207..96c492b3ec 100644
--- a/Jellyfin.Api/Controllers/DlnaServerController.cs
+++ b/Jellyfin.Api/Controllers/DlnaServerController.cs
@@ -274,7 +274,7 @@ namespace Jellyfin.Api.Controllers
         private ActionResult GetIconInternal(string fileName)
         {
             var icon = _dlnaManager.GetIcon(fileName);
-            if (icon == null)
+            if (icon is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index 0f4d3c1ebc..af43bb578e 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -341,7 +341,7 @@ namespace Jellyfin.Api.Controllers
 
             job ??= _transcodingJobHelper.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
 
-            if (job != null)
+            if (job is not null)
             {
                 _transcodingJobHelper.OnTranscodeEndRequest(job);
             }
@@ -1482,7 +1482,7 @@ namespace Jellyfin.Api.Controllers
                         startTranscoding = true;
                         segmentId = 0;
                     }
-                    else if (currentTranscodingIndex == null)
+                    else if (currentTranscodingIndex is null)
                     {
                         _logger.LogDebug("Starting transcoding because currentTranscodingIndex=null");
                         startTranscoding = true;
@@ -1533,7 +1533,7 @@ namespace Jellyfin.Api.Controllers
                     else
                     {
                         job = _transcodingJobHelper.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
-                        if (job?.TranscodingThrottler != null)
+                        if (job?.TranscodingThrottler is not null)
                         {
                             await job.TranscodingThrottler.UnpauseTranscoding().ConfigureAwait(false);
                         }
@@ -1665,7 +1665,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>The command line arguments for audio transcoding.</returns>
         private string GetAudioArguments(StreamState state)
         {
-            if (state.AudioStream == null)
+            if (state.AudioStream is null)
             {
                 return string.Empty;
             }
@@ -1762,7 +1762,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>The command line arguments for video transcoding.</returns>
         private string GetVideoArguments(StreamState state, int startNumber, bool isEventPlaylist)
         {
-            if (state.VideoStream == null)
+            if (state.VideoStream is null)
             {
                 return string.Empty;
             }
@@ -1806,7 +1806,7 @@ namespace Jellyfin.Api.Controllers
             if (EncodingHelper.IsCopyCodec(codec))
             {
                 // If h264_mp4toannexb is ever added, do not use it for live tv.
-                if (state.VideoStream != null && !string.Equals(state.VideoStream.NalLengthSize, "0", StringComparison.OrdinalIgnoreCase))
+                if (state.VideoStream is not null && !string.Equals(state.VideoStream.NalLengthSize, "0", StringComparison.OrdinalIgnoreCase))
                 {
                     string bitStreamArgs = EncodingHelper.GetBitStreamArgs(state.VideoStream);
                     if (!string.IsNullOrEmpty(bitStreamArgs))
@@ -1837,7 +1837,7 @@ namespace Jellyfin.Api.Controllers
 
                 // -start_at_zero is necessary to use with -ss when seeking,
                 // otherwise the target position cannot be determined.
-                if (state.SubtitleStream != null)
+                if (state.SubtitleStream is not null)
                 {
                     // Disable start_at_zero for external graphical subs
                     if (!(state.SubtitleStream.IsExternal && !state.SubtitleStream.IsTextSubtitleStream))
@@ -1883,7 +1883,7 @@ namespace Jellyfin.Api.Controllers
             var segmentExists = System.IO.File.Exists(segmentPath);
             if (segmentExists)
             {
-                if (transcodingJob != null && transcodingJob.HasExited)
+                if (transcodingJob is not null && transcodingJob.HasExited)
                 {
                     // Transcoding job is over, so assume all existing files are ready
                     _logger.LogDebug("serving up {0} as transcode is over", segmentPath);
@@ -1901,7 +1901,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var nextSegmentPath = GetSegmentPath(state, playlistPath, segmentIndex + 1);
-            if (transcodingJob != null)
+            if (transcodingJob is not null)
             {
                 while (!cancellationToken.IsCancellationRequested && !transcodingJob.HasExited)
                 {
@@ -1953,7 +1953,7 @@ namespace Jellyfin.Api.Controllers
             Response.OnCompleted(() =>
             {
                 _logger.LogDebug("Finished serving {SegmentPath}", segmentPath);
-                if (transcodingJob != null)
+                if (transcodingJob is not null)
                 {
                     transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks);
                     _transcodingJobHelper.OnTranscodeEndRequest(transcodingJob);
@@ -1969,14 +1969,14 @@ namespace Jellyfin.Api.Controllers
         {
             var job = _transcodingJobHelper.GetTranscodingJob(playlist, TranscodingJobType);
 
-            if (job == null || job.HasExited)
+            if (job is null || job.HasExited)
             {
                 return null;
             }
 
             var file = GetLastTranscodingFile(playlist, segmentExtension, _fileSystem);
 
-            if (file == null)
+            if (file is null)
             {
                 return null;
             }
@@ -2011,7 +2011,7 @@ namespace Jellyfin.Api.Controllers
         {
             var file = GetLastTranscodingFile(playlistPath, segmentExtension, _fileSystem);
 
-            if (file != null)
+            if (file is not null)
             {
                 DeleteFile(file.FullName, retryCount);
             }
diff --git a/Jellyfin.Api/Controllers/EnvironmentController.cs b/Jellyfin.Api/Controllers/EnvironmentController.cs
index b0b4b5af51..6c78a79875 100644
--- a/Jellyfin.Api/Controllers/EnvironmentController.cs
+++ b/Jellyfin.Api/Controllers/EnvironmentController.cs
@@ -104,7 +104,7 @@ namespace Jellyfin.Api.Controllers
 
                 if (validatePathDto.ValidateWritable)
                 {
-                    if (validatePathDto.Path == null)
+                    if (validatePathDto.Path is null)
                     {
                         throw new ResourceNotFoundException(nameof(validatePathDto.Path));
                     }
diff --git a/Jellyfin.Api/Controllers/FilterController.cs b/Jellyfin.Api/Controllers/FilterController.cs
index 11808b1b82..b6780ee200 100644
--- a/Jellyfin.Api/Controllers/FilterController.cs
+++ b/Jellyfin.Api/Controllers/FilterController.cs
@@ -182,7 +182,7 @@ namespace Jellyfin.Api.Controllers
 
             if ((recursive ?? true) || parentItem is UserView || parentItem is ICollectionFolder)
             {
-                genreQuery.AncestorIds = parentItem == null ? Array.Empty<Guid>() : new[] { parentItem.Id };
+                genreQuery.AncestorIds = parentItem is null ? Array.Empty<Guid>() : new[] { parentItem.Id };
             }
             else
             {
diff --git a/Jellyfin.Api/Controllers/HlsSegmentController.cs b/Jellyfin.Api/Controllers/HlsSegmentController.cs
index 78634f0bfc..50fee233a8 100644
--- a/Jellyfin.Api/Controllers/HlsSegmentController.cs
+++ b/Jellyfin.Api/Controllers/HlsSegmentController.cs
@@ -167,7 +167,7 @@ namespace Jellyfin.Api.Controllers
                 }
             }
 
-            return playlistPath == null
+            return playlistPath is null
                 ? NotFound("Hls segment not found.")
                 : GetFileResult(file, playlistPath);
         }
@@ -178,7 +178,7 @@ namespace Jellyfin.Api.Controllers
 
             Response.OnCompleted(() =>
             {
-                if (transcodingJob != null)
+                if (transcodingJob is not null)
                 {
                     _transcodingJobHelper.OnTranscodeEndRequest(transcodingJob);
                 }
diff --git a/Jellyfin.Api/Controllers/ImageByNameController.cs b/Jellyfin.Api/Controllers/ImageByNameController.cs
index 89bbf22c96..c54851b96e 100644
--- a/Jellyfin.Api/Controllers/ImageByNameController.cs
+++ b/Jellyfin.Api/Controllers/ImageByNameController.cs
@@ -77,7 +77,7 @@ namespace Jellyfin.Api.Controllers
                 .Select(i => Path.GetFullPath(Path.Combine(_applicationPaths.GeneralPath, name, filename + i)))
                 .FirstOrDefault(System.IO.File.Exists);
 
-            if (path == null)
+            if (path is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/ImageController.cs b/Jellyfin.Api/Controllers/ImageController.cs
index f092bd8820..260b9536e3 100644
--- a/Jellyfin.Api/Controllers/ImageController.cs
+++ b/Jellyfin.Api/Controllers/ImageController.cs
@@ -110,7 +110,7 @@ namespace Jellyfin.Api.Controllers
             // Handle image/png; charset=utf-8
             var mimeType = Request.ContentType?.Split(';').FirstOrDefault();
             var userDataPath = Path.Combine(_serverConfigurationManager.ApplicationPaths.UserConfigurationDirectoryPath, user.Username);
-            if (user.ProfileImage != null)
+            if (user.ProfileImage is not null)
             {
                 await _userManager.ClearProfileImageAsync(user).ConfigureAwait(false);
             }
@@ -157,7 +157,7 @@ namespace Jellyfin.Api.Controllers
             // Handle image/png; charset=utf-8
             var mimeType = Request.ContentType?.Split(';').FirstOrDefault();
             var userDataPath = Path.Combine(_serverConfigurationManager.ApplicationPaths.UserConfigurationDirectoryPath, user.Username);
-            if (user.ProfileImage != null)
+            if (user.ProfileImage is not null)
             {
                 await _userManager.ClearProfileImageAsync(user).ConfigureAwait(false);
             }
@@ -198,7 +198,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var user = _userManager.GetUserById(userId);
-            if (user?.ProfileImage == null)
+            if (user?.ProfileImage is null)
             {
                 return NoContent();
             }
@@ -242,7 +242,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var user = _userManager.GetUserById(userId);
-            if (user?.ProfileImage == null)
+            if (user?.ProfileImage is null)
             {
                 return NoContent();
             }
@@ -279,7 +279,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -307,7 +307,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute] int imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -335,7 +335,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] ImageType imageType)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -371,7 +371,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute] int imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -407,7 +407,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery, Required] int newIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -430,7 +430,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult<IEnumerable<ImageInfo>>> GetItemImageInfos([FromRoute, Required] Guid itemId)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -452,7 +452,7 @@ namespace Jellyfin.Api.Controllers
                 {
                     var info = GetImageInfo(item, image, null);
 
-                    if (info != null)
+                    if (info is not null)
                     {
                         list.Add(info);
                     }
@@ -470,7 +470,7 @@ namespace Jellyfin.Api.Controllers
                 {
                     var info = GetImageInfo(item, image, index);
 
-                    if (info != null)
+                    if (info is not null)
                     {
                         list.Add(info);
                     }
@@ -537,7 +537,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -620,7 +620,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -703,7 +703,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] int imageIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -786,7 +786,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] int imageIndex)
         {
             var item = _libraryManager.GetArtist(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -869,7 +869,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetGenre(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -952,7 +952,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var item = _libraryManager.GetGenre(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1035,7 +1035,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetMusicGenre(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1118,7 +1118,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var item = _libraryManager.GetMusicGenre(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1201,7 +1201,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetPerson(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1284,7 +1284,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var item = _libraryManager.GetPerson(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1367,7 +1367,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var item = _libraryManager.GetStudio(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1450,7 +1450,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var item = _libraryManager.GetStudio(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -1533,7 +1533,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? imageIndex)
         {
             var user = _userManager.GetUserById(userId);
-            if (user?.ProfileImage == null)
+            if (user?.ProfileImage is null)
             {
                 return NotFound();
             }
@@ -1634,7 +1634,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? foregroundLayer)
         {
             var user = _userManager.GetUserById(userId);
-            if (user?.ProfileImage == null)
+            if (user?.ProfileImage is null)
             {
                 return NotFound();
             }
@@ -1944,10 +1944,10 @@ namespace Jellyfin.Api.Controllers
                 unplayedCount = null;
             }
 
-            if (imageInfo == null)
+            if (imageInfo is null)
             {
                 imageInfo = item?.GetImageInfo(imageType, imageIndex ?? 0);
-                if (imageInfo == null)
+                if (imageInfo is null)
                 {
                     return NotFound(string.Format(NumberFormatInfo.InvariantInfo, "{0} does not have an image of type {1}", item?.Name, imageType));
                 }
@@ -1968,7 +1968,7 @@ namespace Jellyfin.Api.Controllers
                 { "realTimeInfo.dlna.org", "DLNA.ORG_TLAG=*" }
             };
 
-            if (!imageInfo.IsLocalFile && item != null)
+            if (!imageInfo.IsLocalFile && item is not null)
             {
                 imageInfo = await _libraryManager.ConvertImageToLocal(item, imageInfo, imageIndex ?? 0).ConfigureAwait(false);
             }
diff --git a/Jellyfin.Api/Controllers/ItemLookupController.cs b/Jellyfin.Api/Controllers/ItemLookupController.cs
index c49f856169..34893d682d 100644
--- a/Jellyfin.Api/Controllers/ItemLookupController.cs
+++ b/Jellyfin.Api/Controllers/ItemLookupController.cs
@@ -65,7 +65,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult<IEnumerable<ExternalIdInfo>> GetExternalIdInfos([FromRoute, Required] Guid itemId)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/ItemRefreshController.cs b/Jellyfin.Api/Controllers/ItemRefreshController.cs
index 9340737b50..0dc3fbd05a 100644
--- a/Jellyfin.Api/Controllers/ItemRefreshController.cs
+++ b/Jellyfin.Api/Controllers/ItemRefreshController.cs
@@ -61,7 +61,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] bool replaceAllImages = false)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/ItemUpdateController.cs b/Jellyfin.Api/Controllers/ItemUpdateController.cs
index fd137f98f1..af3d779f56 100644
--- a/Jellyfin.Api/Controllers/ItemUpdateController.cs
+++ b/Jellyfin.Api/Controllers/ItemUpdateController.cs
@@ -71,7 +71,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> UpdateItem([FromRoute, Required] Guid itemId, [FromBody, Required] BaseItemDto request)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -80,13 +80,13 @@ namespace Jellyfin.Api.Controllers
             var isLockedChanged = item.IsLocked != newLockData;
 
             var series = item as Series;
-            var displayOrderChanged = series != null && !string.Equals(
+            var displayOrderChanged = series is not null && !string.Equals(
                 series.DisplayOrder ?? string.Empty,
                 request.DisplayOrder ?? string.Empty,
                 StringComparison.OrdinalIgnoreCase);
 
             // Do this first so that metadata savers can pull the updates from the database.
-            if (request.People != null)
+            if (request.People is not null)
             {
                 _libraryManager.UpdatePeople(
                     item,
@@ -198,7 +198,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult UpdateItemContentType([FromRoute, Required] Guid itemId, [FromQuery] string? contentType)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -248,12 +248,12 @@ namespace Jellyfin.Api.Controllers
 
             item.Tags = request.Tags;
 
-            if (request.Taglines != null)
+            if (request.Taglines is not null)
             {
                 item.Tagline = request.Taglines.FirstOrDefault();
             }
 
-            if (request.Studios != null)
+            if (request.Studios is not null)
             {
                 item.Studios = request.Studios.Select(x => x.Name).ToArray();
             }
@@ -269,7 +269,7 @@ namespace Jellyfin.Api.Controllers
             item.OfficialRating = string.IsNullOrWhiteSpace(request.OfficialRating) ? null : request.OfficialRating;
             item.CustomRating = request.CustomRating;
 
-            if (request.ProductionLocations != null)
+            if (request.ProductionLocations is not null)
             {
                 item.ProductionLocations = request.ProductionLocations;
             }
@@ -289,7 +289,7 @@ namespace Jellyfin.Api.Controllers
 
             item.IsLocked = request.LockData ?? false;
 
-            if (request.LockedFields != null)
+            if (request.LockedFields is not null)
             {
                 item.LockedFields = request.LockedFields;
             }
@@ -315,7 +315,7 @@ namespace Jellyfin.Api.Controllers
                 video.Video3DFormat = request.Video3DFormat;
             }
 
-            if (request.AlbumArtists != null)
+            if (request.AlbumArtists is not null)
             {
                 if (item is IHasAlbumArtist hasAlbumArtists)
                 {
@@ -326,7 +326,7 @@ namespace Jellyfin.Api.Controllers
                 }
             }
 
-            if (request.ArtistItems != null)
+            if (request.ArtistItems is not null)
             {
                 if (item is IHasArtist hasArtists)
                 {
@@ -349,7 +349,7 @@ namespace Jellyfin.Api.Controllers
                 {
                     series.Status = GetSeriesStatus(request);
 
-                    if (request.AirDays != null)
+                    if (request.AirDays is not null)
                     {
                         series.AirDays = request.AirDays;
                         series.AirTime = request.AirTime;
diff --git a/Jellyfin.Api/Controllers/ItemsController.cs b/Jellyfin.Api/Controllers/ItemsController.cs
index 3ee5b8d737..717ddc32b3 100644
--- a/Jellyfin.Api/Controllers/ItemsController.cs
+++ b/Jellyfin.Api/Controllers/ItemsController.cs
@@ -447,7 +447,7 @@ namespace Jellyfin.Api.Controllers
                         {
                             return null;
                         }
-                    }).Where(i => i != null).Select(i => i!.Id).ToArray();
+                    }).Where(i => i is not null).Select(i => i!.Id).ToArray();
                 }
 
                 // ExcludeArtistIds
@@ -483,7 +483,7 @@ namespace Jellyfin.Api.Controllers
                         {
                             return null;
                         }
-                    }).Where(i => i != null).Select(i => i!.Id).ToArray();
+                    }).Where(i => i is not null).Select(i => i!.Id).ToArray();
                 }
 
                 // Apply default sorting if none requested
@@ -837,7 +837,7 @@ namespace Jellyfin.Api.Controllers
             if (excludeActiveSessions)
             {
                 excludeItemIds = _sessionManager.Sessions
-                    .Where(s => s.UserId.Equals(userId) && s.NowPlayingItem != null)
+                    .Where(s => s.UserId.Equals(userId) && s.NowPlayingItem is not null)
                     .Select(s => s.NowPlayingItem.Id)
                     .ToArray();
             }
diff --git a/Jellyfin.Api/Controllers/LibraryController.cs b/Jellyfin.Api/Controllers/LibraryController.cs
index 7d5cfc7ae5..ab20208302 100644
--- a/Jellyfin.Api/Controllers/LibraryController.cs
+++ b/Jellyfin.Api/Controllers/LibraryController.cs
@@ -104,7 +104,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult GetFile([FromRoute, Required] Guid itemId)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -154,7 +154,7 @@ namespace Jellyfin.Api.Controllers
                     : _libraryManager.GetUserRootFolder())
                 : _libraryManager.GetItemById(itemId);
 
-            if (item == null)
+            if (item is null)
             {
                 return NotFound("Item not found.");
             }
@@ -171,7 +171,7 @@ namespace Jellyfin.Api.Controllers
                 }
 
                 var parent = item.GetParent();
-                if (parent == null)
+                if (parent is null)
                 {
                     break;
                 }
@@ -220,7 +220,7 @@ namespace Jellyfin.Api.Controllers
                     : _libraryManager.GetUserRootFolder())
                 : _libraryManager.GetItemById(itemId);
 
-            if (item == null)
+            if (item is null)
             {
                 return NotFound("Item not found.");
             }
@@ -237,7 +237,7 @@ namespace Jellyfin.Api.Controllers
                 }
 
                 var parent = item.GetParent();
-                if (parent == null)
+                if (parent is null)
                 {
                     break;
                 }
@@ -435,7 +435,7 @@ namespace Jellyfin.Api.Controllers
         {
             var item = _libraryManager.GetItemById(itemId);
 
-            if (item == null)
+            if (item is null)
             {
                 return NotFound("Item not found");
             }
@@ -449,9 +449,9 @@ namespace Jellyfin.Api.Controllers
             var dtoOptions = new DtoOptions().AddClientFields(User);
             BaseItem? parent = item.GetParent();
 
-            while (parent != null)
+            while (parent is not null)
             {
-                if (user != null)
+                if (user is not null)
                 {
                     parent = TranslateParentItem(parent, user);
                 }
@@ -610,14 +610,14 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetDownload([FromRoute, Required] Guid itemId)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
 
             var user = _userManager.GetUserById(User.GetUserId());
 
-            if (user != null)
+            if (user is not null)
             {
                 if (!item.CanDownload(user))
                 {
@@ -632,7 +632,7 @@ namespace Jellyfin.Api.Controllers
                 }
             }
 
-            if (user != null)
+            if (user is not null)
             {
                 await LogDownloadAsync(item, user).ConfigureAwait(false);
             }
@@ -686,8 +686,8 @@ namespace Jellyfin.Api.Controllers
                 .AddClientFields(User);
 
             var program = item as IHasProgramAttributes;
-            bool? isMovie = item is Movie || (program != null && program.IsMovie) || item is Trailer;
-            bool? isSeries = item is Series || (program != null && program.IsSeries);
+            bool? isMovie = item is Movie || (program is not null && program.IsMovie) || item is Trailer;
+            bool? isSeries = item is Series || (program is not null && program.IsSeries);
 
             var includeItemTypes = new List<BaseItemKind>();
             if (isMovie.Value)
diff --git a/Jellyfin.Api/Controllers/LibraryStructureController.cs b/Jellyfin.Api/Controllers/LibraryStructureController.cs
index ec1170411c..1c23940556 100644
--- a/Jellyfin.Api/Controllers/LibraryStructureController.cs
+++ b/Jellyfin.Api/Controllers/LibraryStructureController.cs
@@ -82,7 +82,7 @@ namespace Jellyfin.Api.Controllers
         {
             var libraryOptions = libraryOptionsDto?.LibraryOptions ?? new LibraryOptions();
 
-            if (paths != null && paths.Length > 0)
+            if (paths is not null && paths.Length > 0)
             {
                 libraryOptions.PathInfos = paths.Select(i => new MediaPathInfo(i)).ToArray();
             }
diff --git a/Jellyfin.Api/Controllers/LiveTvController.cs b/Jellyfin.Api/Controllers/LiveTvController.cs
index 394df0f58b..94710d78f2 100644
--- a/Jellyfin.Api/Controllers/LiveTvController.cs
+++ b/Jellyfin.Api/Controllers/LiveTvController.cs
@@ -763,7 +763,7 @@ namespace Jellyfin.Api.Controllers
             await AssertUserCanManageLiveTv().ConfigureAwait(false);
 
             var item = _libraryManager.GetItemById(recordingId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -840,7 +840,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult<SeriesTimerInfoDto>> GetSeriesTimer([FromRoute, Required] string timerId)
         {
             var timer = await _liveTvManager.GetSeriesTimer(timerId, CancellationToken.None).ConfigureAwait(false);
-            if (timer == null)
+            if (timer is null)
             {
                 return NotFound();
             }
@@ -1201,7 +1201,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult GetLiveStreamFile([FromRoute, Required] string streamId, [FromRoute, Required] string container)
         {
             var liveStreamInfo = _mediaSourceManager.GetLiveStreamInfoByUniqueId(streamId);
-            if (liveStreamInfo == null)
+            if (liveStreamInfo is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/MediaInfoController.cs b/Jellyfin.Api/Controllers/MediaInfoController.cs
index c111e92186..8115c35852 100644
--- a/Jellyfin.Api/Controllers/MediaInfoController.cs
+++ b/Jellyfin.Api/Controllers/MediaInfoController.cs
@@ -121,10 +121,10 @@ namespace Jellyfin.Api.Controllers
             var profile = playbackInfoDto?.DeviceProfile;
             _logger.LogDebug("GetPostedPlaybackInfo profile: {@Profile}", profile);
 
-            if (profile == null)
+            if (profile is null)
             {
                 var caps = _deviceManager.GetCapabilities(User.GetDeviceId());
-                if (caps != null)
+                if (caps is not null)
                 {
                     profile = caps.DeviceProfile;
                 }
@@ -154,12 +154,12 @@ namespace Jellyfin.Api.Controllers
                     liveStreamId)
                 .ConfigureAwait(false);
 
-            if (info.ErrorCode != null)
+            if (info.ErrorCode is not null)
             {
                 return info;
             }
 
-            if (profile != null)
+            if (profile is not null)
             {
                 // set device specific data
                 var item = _libraryManager.GetItemById(itemId);
@@ -194,7 +194,7 @@ namespace Jellyfin.Api.Controllers
             {
                 var mediaSource = string.IsNullOrWhiteSpace(mediaSourceId) ? info.MediaSources[0] : info.MediaSources.FirstOrDefault(i => string.Equals(i.Id, mediaSourceId, StringComparison.Ordinal));
 
-                if (mediaSource != null && mediaSource.RequiresOpening && string.IsNullOrWhiteSpace(mediaSource.LiveStreamId))
+                if (mediaSource is not null && mediaSource.RequiresOpening && string.IsNullOrWhiteSpace(mediaSource.LiveStreamId))
                 {
                     var openStreamResult = await _mediaInfoHelper.OpenMediaSource(
                         HttpContext,
diff --git a/Jellyfin.Api/Controllers/PackageController.cs b/Jellyfin.Api/Controllers/PackageController.cs
index 9690aead0c..0aa7c2ac9e 100644
--- a/Jellyfin.Api/Controllers/PackageController.cs
+++ b/Jellyfin.Api/Controllers/PackageController.cs
@@ -54,7 +54,7 @@ namespace Jellyfin.Api.Controllers
                     assemblyGuid ?? default)
                 .FirstOrDefault();
 
-            if (result == null)
+            if (result is null)
             {
                 return NotFound();
             }
@@ -110,7 +110,7 @@ namespace Jellyfin.Api.Controllers
                     specificVersion: string.IsNullOrEmpty(version) ? null : Version.Parse(version))
                 .FirstOrDefault();
 
-            if (package == null)
+            if (package is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/PersonsController.cs b/Jellyfin.Api/Controllers/PersonsController.cs
index 42be969b29..09f7281ecb 100644
--- a/Jellyfin.Api/Controllers/PersonsController.cs
+++ b/Jellyfin.Api/Controllers/PersonsController.cs
@@ -122,7 +122,7 @@ namespace Jellyfin.Api.Controllers
                 .AddClientFields(User);
 
             var item = _libraryManager.GetPerson(name);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/PlaylistsController.cs b/Jellyfin.Api/Controllers/PlaylistsController.cs
index fb045f891e..e0c565da18 100644
--- a/Jellyfin.Api/Controllers/PlaylistsController.cs
+++ b/Jellyfin.Api/Controllers/PlaylistsController.cs
@@ -176,7 +176,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery, ModelBinder(typeof(CommaDelimitedArrayModelBinder))] ImageType[] enableImageTypes)
         {
             var playlist = (Playlist)_libraryManager.GetItemById(playlistId);
-            if (playlist == null)
+            if (playlist is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/PlaystateController.cs b/Jellyfin.Api/Controllers/PlaystateController.cs
index 3a2ba033ea..58f9b7d356 100644
--- a/Jellyfin.Api/Controllers/PlaystateController.cs
+++ b/Jellyfin.Api/Controllers/PlaystateController.cs
@@ -353,7 +353,7 @@ namespace Jellyfin.Api.Controllers
             if (method == PlayMethod.Transcode)
             {
                 var job = string.IsNullOrWhiteSpace(playSessionId) ? null : _transcodingJobHelper.GetTranscodingJob(playSessionId);
-                if (job == null)
+                if (job is null)
                 {
                     return PlayMethod.DirectPlay;
                 }
diff --git a/Jellyfin.Api/Controllers/PluginsController.cs b/Jellyfin.Api/Controllers/PluginsController.cs
index b227dba2df..6a729b2373 100644
--- a/Jellyfin.Api/Controllers/PluginsController.cs
+++ b/Jellyfin.Api/Controllers/PluginsController.cs
@@ -71,7 +71,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult EnablePlugin([FromRoute, Required] Guid pluginId, [FromRoute, Required] Version version)
         {
             var plugin = _pluginManager.GetPlugin(pluginId, version);
-            if (plugin == null)
+            if (plugin is null)
             {
                 return NotFound();
             }
@@ -95,7 +95,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult DisablePlugin([FromRoute, Required] Guid pluginId, [FromRoute, Required] Version version)
         {
             var plugin = _pluginManager.GetPlugin(pluginId, version);
-            if (plugin == null)
+            if (plugin is null)
             {
                 return NotFound();
             }
@@ -119,7 +119,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult UninstallPluginByVersion([FromRoute, Required] Guid pluginId, [FromRoute, Required] Version version)
         {
             var plugin = _pluginManager.GetPlugin(pluginId, version);
-            if (plugin == null)
+            if (plugin is null)
             {
                 return NotFound();
             }
@@ -146,9 +146,9 @@ namespace Jellyfin.Api.Controllers
             var plugins = _pluginManager.Plugins.Where(p => p.Id.Equals(pluginId));
 
             // Select the un-instanced one first.
-            var plugin = plugins.FirstOrDefault(p => p.Instance == null) ?? plugins.OrderBy(p => p.Manifest.Status).FirstOrDefault();
+            var plugin = plugins.FirstOrDefault(p => p.Instance is null) ?? plugins.OrderBy(p => p.Manifest.Status).FirstOrDefault();
 
-            if (plugin != null)
+            if (plugin is not null)
             {
                 _installationManager.UninstallPlugin(plugin);
                 return NoContent();
@@ -202,7 +202,7 @@ namespace Jellyfin.Api.Controllers
             var configuration = (BasePluginConfiguration?)await JsonSerializer.DeserializeAsync(Request.Body, configPlugin.ConfigurationType, _serializerOptions)
                 .ConfigureAwait(false);
 
-            if (configuration != null)
+            if (configuration is not null)
             {
                 configPlugin.UpdateConfiguration(configuration);
             }
@@ -225,13 +225,13 @@ namespace Jellyfin.Api.Controllers
         public ActionResult GetPluginImage([FromRoute, Required] Guid pluginId, [FromRoute, Required] Version version)
         {
             var plugin = _pluginManager.GetPlugin(pluginId, version);
-            if (plugin == null)
+            if (plugin is null)
             {
                 return NotFound();
             }
 
             var imagePath = Path.Combine(plugin.Path, plugin.Manifest.ImagePath ?? string.Empty);
-            if (plugin.Manifest.ImagePath == null || !System.IO.File.Exists(imagePath))
+            if (plugin.Manifest.ImagePath is null || !System.IO.File.Exists(imagePath))
             {
                 return NotFound();
             }
@@ -254,7 +254,7 @@ namespace Jellyfin.Api.Controllers
         {
             var plugin = _pluginManager.GetPlugin(pluginId);
 
-            if (plugin != null)
+            if (plugin is not null)
             {
                 return plugin.Manifest;
             }
diff --git a/Jellyfin.Api/Controllers/RemoteImageController.cs b/Jellyfin.Api/Controllers/RemoteImageController.cs
index dbee56e140..da9e8cf90d 100644
--- a/Jellyfin.Api/Controllers/RemoteImageController.cs
+++ b/Jellyfin.Api/Controllers/RemoteImageController.cs
@@ -68,7 +68,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] bool includeAllLanguages = false)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -127,7 +127,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult<IEnumerable<ImageProviderInfo>> GetRemoteImageProviders([FromRoute, Required] Guid itemId)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -154,7 +154,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? imageUrl)
         {
             var item = _libraryManager.GetItemById(itemId);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/ScheduledTasksController.cs b/Jellyfin.Api/Controllers/ScheduledTasksController.cs
index 68e4f0586f..832e145050 100644
--- a/Jellyfin.Api/Controllers/ScheduledTasksController.cs
+++ b/Jellyfin.Api/Controllers/ScheduledTasksController.cs
@@ -76,7 +76,7 @@ namespace Jellyfin.Api.Controllers
             var task = _taskManager.ScheduledTasks.FirstOrDefault(i =>
                 string.Equals(i.Id, taskId, StringComparison.OrdinalIgnoreCase));
 
-            if (task == null)
+            if (task is null)
             {
                 return NotFound();
             }
@@ -99,7 +99,7 @@ namespace Jellyfin.Api.Controllers
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
                 o.Id.Equals(taskId, StringComparison.OrdinalIgnoreCase));
 
-            if (task == null)
+            if (task is null)
             {
                 return NotFound();
             }
@@ -123,7 +123,7 @@ namespace Jellyfin.Api.Controllers
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
                 o.Id.Equals(taskId, StringComparison.OrdinalIgnoreCase));
 
-            if (task == null)
+            if (task is null)
             {
                 return NotFound();
             }
@@ -149,7 +149,7 @@ namespace Jellyfin.Api.Controllers
         {
             var task = _taskManager.ScheduledTasks.FirstOrDefault(o =>
                 o.Id.Equals(taskId, StringComparison.OrdinalIgnoreCase));
-            if (task == null)
+            if (task is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/SearchController.cs b/Jellyfin.Api/Controllers/SearchController.cs
index aeed0c0d61..3b7719f373 100644
--- a/Jellyfin.Api/Controllers/SearchController.cs
+++ b/Jellyfin.Api/Controllers/SearchController.cs
@@ -161,7 +161,7 @@ namespace Jellyfin.Api.Controllers
 
             var primaryImageTag = _imageProcessor.GetImageCacheTag(item, ImageType.Primary);
 
-            if (primaryImageTag != null)
+            if (primaryImageTag is not null)
             {
                 result.PrimaryImageTag = primaryImageTag;
                 result.PrimaryImageAspectRatio = _dtoService.GetPrimaryImageAspectRatio(item);
@@ -195,7 +195,7 @@ namespace Jellyfin.Api.Controllers
 
                     MusicAlbum musicAlbum = song.AlbumEntity;
 
-                    if (musicAlbum != null)
+                    if (musicAlbum is not null)
                     {
                         result.Album = musicAlbum.Name;
                         result.AlbumId = musicAlbum.Id;
@@ -221,18 +221,18 @@ namespace Jellyfin.Api.Controllers
         {
             var itemWithImage = item.HasImage(ImageType.Thumb) ? item : null;
 
-            if (itemWithImage == null && item is Episode)
+            if (itemWithImage is null && item is Episode)
             {
                 itemWithImage = GetParentWithImage<Series>(item, ImageType.Thumb);
             }
 
             itemWithImage ??= GetParentWithImage<BaseItem>(item, ImageType.Thumb);
 
-            if (itemWithImage != null)
+            if (itemWithImage is not null)
             {
                 var tag = _imageProcessor.GetImageCacheTag(itemWithImage, ImageType.Thumb);
 
-                if (tag != null)
+                if (tag is not null)
                 {
                     hint.ThumbImageTag = tag;
                     hint.ThumbImageItemId = itemWithImage.Id.ToString("N", CultureInfo.InvariantCulture);
@@ -245,11 +245,11 @@ namespace Jellyfin.Api.Controllers
             var itemWithImage = (item.HasImage(ImageType.Backdrop) ? item : null)
                 ?? GetParentWithImage<BaseItem>(item, ImageType.Backdrop);
 
-            if (itemWithImage != null)
+            if (itemWithImage is not null)
             {
                 var tag = _imageProcessor.GetImageCacheTag(itemWithImage, ImageType.Backdrop);
 
-                if (tag != null)
+                if (tag is not null)
                 {
                     hint.BackdropImageTag = tag;
                     hint.BackdropImageItemId = itemWithImage.Id.ToString("N", CultureInfo.InvariantCulture);
diff --git a/Jellyfin.Api/Controllers/SessionController.cs b/Jellyfin.Api/Controllers/SessionController.cs
index 31b95162d4..9218c3b5cf 100644
--- a/Jellyfin.Api/Controllers/SessionController.cs
+++ b/Jellyfin.Api/Controllers/SessionController.cs
@@ -294,7 +294,7 @@ namespace Jellyfin.Api.Controllers
         {
             var currentSession = await RequestHelpers.GetSession(_sessionManager, _userManager, HttpContext).ConfigureAwait(false);
 
-            if (command == null)
+            if (command is null)
             {
                 throw new ArgumentException("Request body may not be null");
             }
diff --git a/Jellyfin.Api/Controllers/StartupController.cs b/Jellyfin.Api/Controllers/StartupController.cs
index c49bde93f1..eec5779e64 100644
--- a/Jellyfin.Api/Controllers/StartupController.cs
+++ b/Jellyfin.Api/Controllers/StartupController.cs
@@ -132,7 +132,7 @@ namespace Jellyfin.Api.Controllers
         {
             var user = _userManager.Users.First();
 
-            if (startupUserDto.Name != null)
+            if (startupUserDto.Name is not null)
             {
                 user.Username = startupUserDto.Name;
             }
diff --git a/Jellyfin.Api/Controllers/SubtitleController.cs b/Jellyfin.Api/Controllers/SubtitleController.cs
index 1258a9876b..ff9bd095b5 100644
--- a/Jellyfin.Api/Controllers/SubtitleController.cs
+++ b/Jellyfin.Api/Controllers/SubtitleController.cs
@@ -96,7 +96,7 @@ namespace Jellyfin.Api.Controllers
         {
             var item = _libraryManager.GetItemById(itemId);
 
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
@@ -522,7 +522,7 @@ namespace Jellyfin.Api.Controllers
                     .First(i => string.Equals(i.Name, name, StringComparison.OrdinalIgnoreCase));
                 var fileSize = fontFile?.Length;
 
-                if (fontFile != null && fileSize != null && fileSize > 0)
+                if (fontFile is not null && fileSize is not null && fileSize > 0)
                 {
                     _logger.LogDebug("Fallback font size is {FileSize} Bytes", fileSize);
                     return PhysicalFile(fontFile.FullName, MimeTypes.GetMimeType(fontFile.FullName));
diff --git a/Jellyfin.Api/Controllers/TvShowsController.cs b/Jellyfin.Api/Controllers/TvShowsController.cs
index ea13ceb91c..7f4f4d0776 100644
--- a/Jellyfin.Api/Controllers/TvShowsController.cs
+++ b/Jellyfin.Api/Controllers/TvShowsController.cs
@@ -247,7 +247,7 @@ namespace Jellyfin.Api.Controllers
                     .GetSeasons(user, dtoOptions)
                     .FirstOrDefault(i => i.IndexNumber == season.Value);
 
-                episodes = seasonItem == null ?
+                episodes = seasonItem is null ?
                     new List<BaseItem>()
                     : ((Season)seasonItem).GetEpisodes(user, dtoOptions);
             }
diff --git a/Jellyfin.Api/Controllers/UserController.cs b/Jellyfin.Api/Controllers/UserController.cs
index ff653fe6bb..002327d741 100644
--- a/Jellyfin.Api/Controllers/UserController.cs
+++ b/Jellyfin.Api/Controllers/UserController.cs
@@ -124,7 +124,7 @@ namespace Jellyfin.Api.Controllers
         {
             var user = _userManager.GetUserById(userId);
 
-            if (user == null)
+            if (user is null)
             {
                 return NotFound("User not found");
             }
@@ -173,7 +173,7 @@ namespace Jellyfin.Api.Controllers
         {
             var user = _userManager.GetUserById(userId);
 
-            if (user == null)
+            if (user is null)
             {
                 return NotFound("User not found");
             }
@@ -272,7 +272,7 @@ namespace Jellyfin.Api.Controllers
 
             var user = _userManager.GetUserById(userId);
 
-            if (user == null)
+            if (user is null)
             {
                 return NotFound("User not found");
             }
@@ -292,7 +292,7 @@ namespace Jellyfin.Api.Controllers
                         HttpContext.GetNormalizedRemoteIp().ToString(),
                         false).ConfigureAwait(false);
 
-                    if (success == null)
+                    if (success is null)
                     {
                         return StatusCode(StatusCodes.Status403Forbidden, "Invalid user or password entered.");
                     }
@@ -333,7 +333,7 @@ namespace Jellyfin.Api.Controllers
 
             var user = _userManager.GetUserById(userId);
 
-            if (user == null)
+            if (user is null)
             {
                 return NotFound("User not found");
             }
@@ -477,7 +477,7 @@ namespace Jellyfin.Api.Controllers
             var newUser = await _userManager.CreateUserAsync(request.Name).ConfigureAwait(false);
 
             // no need to authenticate password for new user
-            if (request.Password != null)
+            if (request.Password is not null)
             {
                 await _userManager.ChangePassword(newUser, request.Password).ConfigureAwait(false);
             }
@@ -544,7 +544,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var user = _userManager.GetUserById(userId);
-            if (user == null)
+            if (user is null)
             {
                 return BadRequest();
             }
diff --git a/Jellyfin.Api/Controllers/UserLibraryController.cs b/Jellyfin.Api/Controllers/UserLibraryController.cs
index 8a2d5a27d9..c18fa29af6 100644
--- a/Jellyfin.Api/Controllers/UserLibraryController.cs
+++ b/Jellyfin.Api/Controllers/UserLibraryController.cs
@@ -306,7 +306,7 @@ namespace Jellyfin.Api.Controllers
                 var item = i.Item2[0];
                 var childCount = 0;
 
-                if (i.Item1 != null && (i.Item2.Count > 1 || i.Item1 is MusicAlbum))
+                if (i.Item1 is not null && (i.Item2.Count > 1 || i.Item1 is MusicAlbum))
                 {
                     item = i.Item1;
                     childCount = i.Item2.Count;
@@ -402,7 +402,7 @@ namespace Jellyfin.Api.Controllers
         {
             var user = _userManager.GetUserById(userId);
 
-            if (user == null)
+            if (user is null)
             {
                 return NotFound();
             }
@@ -411,7 +411,7 @@ namespace Jellyfin.Api.Controllers
                 ? _libraryManager.GetUserRootFolder()
                 : _libraryManager.GetItemById(itemId);
 
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/UserViewsController.cs b/Jellyfin.Api/Controllers/UserViewsController.cs
index 85d154cac2..3aeb444dfa 100644
--- a/Jellyfin.Api/Controllers/UserViewsController.cs
+++ b/Jellyfin.Api/Controllers/UserViewsController.cs
@@ -117,7 +117,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult<IEnumerable<SpecialViewOptionDto>> GetGroupingOptions([FromRoute, Required] Guid userId)
         {
             var user = _userManager.GetUserById(userId);
-            if (user == null)
+            if (user is null)
             {
                 return NotFound();
             }
diff --git a/Jellyfin.Api/Controllers/VideoAttachmentsController.cs b/Jellyfin.Api/Controllers/VideoAttachmentsController.cs
index c2bb0dfffe..bb31626142 100644
--- a/Jellyfin.Api/Controllers/VideoAttachmentsController.cs
+++ b/Jellyfin.Api/Controllers/VideoAttachmentsController.cs
@@ -55,7 +55,7 @@ namespace Jellyfin.Api.Controllers
             try
             {
                 var item = _libraryManager.GetItemById(videoId);
-                if (item == null)
+                if (item is null)
                 {
                     return NotFound();
                 }
diff --git a/Jellyfin.Api/Controllers/VideosController.cs b/Jellyfin.Api/Controllers/VideosController.cs
index bf08ad376b..64d8fb498b 100644
--- a/Jellyfin.Api/Controllers/VideosController.cs
+++ b/Jellyfin.Api/Controllers/VideosController.cs
@@ -149,7 +149,7 @@ namespace Jellyfin.Api.Controllers
         {
             var video = (Video)_libraryManager.GetItemById(itemId);
 
-            if (video == null)
+            if (video is null)
             {
                 return NotFound("The video either does not exist or the id does not belong to a video.");
             }
@@ -199,7 +199,7 @@ namespace Jellyfin.Api.Controllers
             }
 
             var primaryVersion = items.FirstOrDefault(i => i.MediaSourceCount > 1 && string.IsNullOrEmpty(i.PrimaryVersionId));
-            if (primaryVersion == null)
+            if (primaryVersion is null)
             {
                 primaryVersion = items
                     .OrderBy(i =>
@@ -439,12 +439,12 @@ namespace Jellyfin.Api.Controllers
                     cancellationTokenSource.Token)
                 .ConfigureAwait(false);
 
-            if (@static.HasValue && @static.Value && state.DirectStreamProvider != null)
+            if (@static.HasValue && @static.Value && state.DirectStreamProvider is not null)
             {
                 StreamingHelpers.AddDlnaHeaders(state, Response.Headers, true, state.Request.StartTimeTicks, Request, _dlnaManager);
 
                 var liveStreamInfo = _mediaSourceManager.GetLiveStreamInfo(streamingRequest.LiveStreamId);
-                if (liveStreamInfo == null)
+                if (liveStreamInfo is null)
                 {
                     return NotFound();
                 }
@@ -472,7 +472,7 @@ namespace Jellyfin.Api.Controllers
             var outputPathExists = System.IO.File.Exists(outputPath);
 
             var transcodingJob = _transcodingJobHelper.GetTranscodingJob(outputPath, TranscodingJobType.Progressive);
-            var isTranscodeCached = outputPathExists && transcodingJob != null;
+            var isTranscodeCached = outputPathExists && transcodingJob is not null;
 
             StreamingHelpers.AddDlnaHeaders(state, Response.Headers, (@static.HasValue && @static.Value) || isTranscodeCached, state.Request.StartTimeTicks, Request, _dlnaManager);
 
diff --git a/Jellyfin.Api/Controllers/YearsController.cs b/Jellyfin.Api/Controllers/YearsController.cs
index b732bdff3c..cd85ba221b 100644
--- a/Jellyfin.Api/Controllers/YearsController.cs
+++ b/Jellyfin.Api/Controllers/YearsController.cs
@@ -152,7 +152,7 @@ namespace Jellyfin.Api.Controllers
             var result = new QueryResult<BaseItemDto>(
                 startIndex,
                 ibnItemsArray.Count,
-                dtos.Where(i => i != null).ToArray());
+                dtos.Where(i => i is not null).ToArray());
             return result;
         }
 
@@ -173,7 +173,7 @@ namespace Jellyfin.Api.Controllers
         public ActionResult<BaseItemDto> GetYear([FromRoute, Required] int year, [FromQuery] Guid? userId)
         {
             var item = _libraryManager.GetYear(year);
-            if (item == null)
+            if (item is null)
             {
                 return NotFound();
             }