Minor perf improvements

Emby.Dlna/ContentDirectory/ControlHandler.cs

@@ -1346,8 +1346,8 @@ namespace Emby.Dlna.ContentDirectory
             {
                 if (id.StartsWith(name + "_", StringComparison.OrdinalIgnoreCase))
                 {
-                    stubType = (StubType)Enum.Parse(typeof(StubType), name, true);
-                    id = id.Split(new[] { '_' }, 2)[1];
+                    stubType = Enum.Parse<StubType>(name, true);
+                    id = id.Split('_', 2)[1];
 
                     break;
                 }

Emby.Dlna/Didl/DidlBuilder.cs

@@ -123,7 +123,7 @@ namespace Emby.Dlna.Didl
         {
             foreach (var att in profile.XmlRootAttributes)
             {
-                var parts = att.Name.Split(new[] { ':' }, StringSplitOptions.RemoveEmptyEntries);
+                var parts = att.Name.Split(':', StringSplitOptions.RemoveEmptyEntries);
                 if (parts.Length == 2)
                 {
                     writer.WriteAttributeString(parts[0], parts[1], null, att.Value);

Emby.Dlna/DlnaManager.cs

@@ -383,9 +383,9 @@ namespace Emby.Dlna
                     continue;
                 }
 
-                var filename = Path.GetFileName(name).Substring(namespaceName.Length);
-
-                var path = Path.Combine(systemProfilesPath, filename);
+                var path = Path.Join(
+                    systemProfilesPath,
+                    Path.GetFileName(name.AsSpan()).Slice(namespaceName.Length));
 
                 using (var stream = _assembly.GetManifestResourceStream(name))
                 {

Emby.Dlna/Eventing/DlnaEventManager.cs

@@ -168,7 +168,7 @@ namespace Emby.Dlna.Eventing
 
             builder.Append("</e:propertyset>");
 
-            using var options = new HttpRequestMessage(new HttpMethod("NOTIFY"),  subscription.CallbackUrl);
+            using var options = new HttpRequestMessage(new HttpMethod("NOTIFY"), subscription.CallbackUrl);
             options.Content = new StringContent(builder.ToString(), Encoding.UTF8, MediaTypeNames.Text.Xml);
             options.Headers.TryAddWithoutValidation("NT", subscription.NotificationType);
             options.Headers.TryAddWithoutValidation("NTS", "upnp:propchange");

Emby.Dlna/Main/DlnaEntryPoint.cs

@@ -257,9 +257,10 @@ namespace Emby.Dlna.Main
 
         private async Task RegisterServerEndpoints()
         {
-            var addresses = await _appHost.GetLocalIpAddresses(CancellationToken.None).ConfigureAwait(false);
+            var addresses = await _appHost.GetLocalIpAddresses().ConfigureAwait(false);
 
             var udn = CreateUuid(_appHost.SystemId);
+            var descriptorUri = "/dlna/" + udn + "/description.xml";
 
             foreach (var address in addresses)
             {
@@ -279,7 +280,6 @@ namespace Emby.Dlna.Main
 
                 _logger.LogInformation("Registering publisher for {0} on {1}", fullService, address);
 
-                var descriptorUri = "/dlna/" + udn + "/description.xml";
                 var uri = new Uri(_appHost.GetLocalApiUrl(address) + descriptorUri);
 
                 var device = new SsdpRootDevice

Emby.Dlna/PlayTo/PlayToController.cs

@@ -326,7 +326,7 @@ namespace Emby.Dlna.PlayTo
 
         public Task SendPlayCommand(PlayRequest command, CancellationToken cancellationToken)
         {
-            _logger.LogDebug("{0} - Received PlayRequest: {1}", this._session.DeviceName, command.PlayCommand);
+            _logger.LogDebug("{0} - Received PlayRequest: {1}", _session.DeviceName, command.PlayCommand);
 
             var user = command.ControllingUserId.Equals(Guid.Empty) ? null : _userManager.GetUserById(command.ControllingUserId);
 
@@ -339,7 +339,7 @@ namespace Emby.Dlna.PlayTo
             var startIndex = command.StartIndex ?? 0;
             if (startIndex > 0)
             {
-                items = items.Skip(startIndex).ToList();
+                items = items.GetRange(startIndex, items.Count - startIndex);
             }
 
             var playlist = new List<PlaylistItem>();

Emby.Notifications/NotificationEntryPoint.cs

@@ -209,7 +209,10 @@ namespace Emby.Notifications
                 _libraryUpdateTimer = null;
             }
 
-            items = items.Take(10).ToList();
+            if (items.Count > 10)
+            {
+                items = items.GetRange(0, 10);
+            }
 
             foreach (var item in items)
             {

Emby.Server.Implementations/Channels/ChannelManager.cs

@@ -250,21 +250,16 @@ namespace Emby.Server.Implementations.Channels
             var all = channels;
             var totalCount = all.Count;
 
-            if (query.StartIndex.HasValue)
+            if (query.StartIndex.HasValue || query.Limit.HasValue)
             {
-                all = all.Skip(query.StartIndex.Value).ToList();
+                int startIndex = query.StartIndex ?? 0;
+                int count = query.Limit == null ? totalCount - startIndex : Math.Min(query.Limit.Value, totalCount - startIndex);
+                all = all.GetRange(startIndex, count);
             }
 
-            if (query.Limit.HasValue)
-            {
-                all = all.Take(query.Limit.Value).ToList();
-            }
-
-            var returnItems = all.ToArray();
-
             if (query.RefreshLatestChannelItems)
             {
-                foreach (var item in returnItems)
+                foreach (var item in all)
                 {
                     RefreshLatestChannelItems(GetChannelProvider(item), CancellationToken.None).GetAwaiter().GetResult();
                 }
@@ -272,7 +267,7 @@ namespace Emby.Server.Implementations.Channels
 
             return new QueryResult<Channel>
             {
-                Items = returnItems,
+                Items = all,
                 TotalRecordCount = totalCount
             };
         }

Jellyfin.Api/Controllers/InstantMixController.cs

@@ -316,9 +316,9 @@ namespace Jellyfin.Api.Controllers
                 TotalRecordCount = list.Count
             };
 
-            if (limit.HasValue)
+            if (limit.HasValue && limit > list.Count)
             {
-                list = list.Take(limit.Value).ToList();
+                list = list.GetRange(0, limit.Value);
             }
 
             var returnList = _dtoService.GetBaseItemDtos(list, dtoOptions, user);

Jellyfin.Api/Controllers/UniversalAudioController.cs

@@ -268,20 +268,24 @@ namespace Jellyfin.Api.Controllers
         {
             var deviceProfile = new DeviceProfile();
 
-            var directPlayProfiles = new List<DirectPlayProfile>();
-
             var containers = RequestHelpers.Split(container, ',', true);
-
-            foreach (var cont in containers)
+            int len = containers.Length;
+            var directPlayProfiles = new DirectPlayProfile[len];
+            for (int i = 0; i < len; i++)
             {
-                var parts = RequestHelpers.Split(cont, '|', true);
+                var parts = RequestHelpers.Split(containers[i], '|', true);
 
-                var audioCodecs = parts.Length == 1 ? null : string.Join(",", parts.Skip(1).ToArray());
+                var audioCodecs = parts.Length == 1 ? null : string.Join(',', parts.Skip(1));
 
-                directPlayProfiles.Add(new DirectPlayProfile { Type = DlnaProfileType.Audio, Container = parts[0], AudioCodec = audioCodecs });
+                directPlayProfiles[i] = new DirectPlayProfile
+                {
+                    Type = DlnaProfileType.Audio,
+                    Container = parts[0],
+                    AudioCodec = audioCodecs
+                };
             }
 
-            deviceProfile.DirectPlayProfiles = directPlayProfiles.ToArray();
+            deviceProfile.DirectPlayProfiles = directPlayProfiles;
 
             deviceProfile.TranscodingProfiles = new[]
             {

Jellyfin.Api/Helpers/SimilarItemsHelper.cs

@@ -50,9 +50,9 @@ namespace Jellyfin.Api.Helpers
 
             var returnItems = items;
 
-            if (limit.HasValue)
+            if (limit.HasValue && limit > returnItems.Count)
             {
-                returnItems = returnItems.Take(limit.Value).ToList();
+                returnItems = returnItems.GetRange(0, limit.Value);
             }
 
             var dtos = dtoService.GetBaseItemDtos(returnItems, dtoOptions, user);

MediaBrowser.Controller/IServerApplicationHost.cs

@@ -56,10 +56,11 @@ namespace MediaBrowser.Controller
         /// <summary>
         /// Gets the system info.
         /// </summary>
+        /// <param name="cancellationToken">A cancellation token that can be used to cancel the task.</param>
         /// <returns>SystemInfo.</returns>
-        Task<SystemInfo> GetSystemInfo(CancellationToken cancellationToken);
+        Task<SystemInfo> GetSystemInfo(CancellationToken cancellationToken = default);
 
-        Task<PublicSystemInfo> GetPublicSystemInfo(CancellationToken cancellationToken);
+        Task<PublicSystemInfo> GetPublicSystemInfo(CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Gets all the local IP addresses of this API instance. Each address is validated by sending a 'ping' request
@@ -67,7 +68,7 @@ namespace MediaBrowser.Controller
         /// </summary>
         /// <param name="cancellationToken">A cancellation token that can be used to cancel the task.</param>
         /// <returns>A list containing all the local IP addresses of the server.</returns>
-        Task<List<IPAddress>> GetLocalIpAddresses(CancellationToken cancellationToken);
+        Task<List<IPAddress>> GetLocalIpAddresses(CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Gets a local (LAN) URL that can be used to access the API. The hostname used is the first valid configured
@@ -75,7 +76,7 @@ namespace MediaBrowser.Controller
         /// </summary>
         /// <param name="cancellationToken">A cancellation token that can be used to cancel the task.</param>
         /// <returns>The server URL.</returns>
-        Task<string> GetLocalApiUrl(CancellationToken cancellationToken);
+        Task<string> GetLocalApiUrl(CancellationToken cancellationToken = default);
 
         /// <summary>
         /// Gets a localhost URL that can be used to access the API using the loop-back IP address (127.0.0.1)