Added support for ImmutableLists

src/ExtendedXmlSerializer/ExtensionModel/DefaultExtensions.cs

@@ -59,6 +59,7 @@ public override IEnumerator<ISerializerExtension> GetEnumerator()
 			yield return new AllowedMemberValuesExtension();
 			yield return new MemberFormatExtension();
 			yield return ImmutableArrayExtension.Default;
+			yield return ImmutableListExtension.Default;
 			yield return SerializationExtension.Default;
 			yield return NullableStructureAwareExtension.Default;
 			yield return new CustomSerializationExtension();

src/ExtendedXmlSerializer/ExtensionModel/Types/ImmutableListExtension.cs

@@ -0,0 +1,94 @@
+using ExtendedXmlSerializer.ContentModel;
+using ExtendedXmlSerializer.ContentModel.Collections;
+using ExtendedXmlSerializer.ContentModel.Content;
+using ExtendedXmlSerializer.ContentModel.Format;
+using ExtendedXmlSerializer.ContentModel.Identification;
+using ExtendedXmlSerializer.ContentModel.Reflection;
+using ExtendedXmlSerializer.Core;
+using ExtendedXmlSerializer.Core.Specifications;
+using ExtendedXmlSerializer.ReflectionModel;
+using JetBrains.Annotations;
+using System.Collections.Immutable;
+using System.Collections.ObjectModel;
+using System.Reflection;
+
+namespace ExtendedXmlSerializer.ExtensionModel.Types
+{
+	sealed class ImmutableListExtension : ISerializerExtension
+	{
+		public static ImmutableListExtension Default { get; } = new ImmutableListExtension();
+
+		ImmutableListExtension() : this(new IsAssignableGenericSpecification(typeof(ImmutableList<>))) {}
+
+		readonly ISpecification<TypeInfo> _specification;
+
+		public ImmutableListExtension(ISpecification<TypeInfo> specification) => _specification = specification;
+
+		public IServiceRepository Get(IServiceRepository parameter)
+			=> parameter.DecorateContentsWith<ImmutableLists>()
+			            .When(_specification)
+			            .Decorate<IGenericTypes, GenericTypes>();
+
+		void ICommand<IServices>.Execute(IServices parameter) {}
+
+		sealed class GenericTypes : IGenericTypes
+		{
+			readonly static TypeInfo Check = typeof(ImmutableList).GetTypeInfo();
+			readonly static ImmutableArray<TypeInfo> Type = typeof(ImmutableList<>).GetTypeInfo()
+			                                                                       .Yield()
+			                                                                       .ToImmutableArray();
+
+			readonly IGenericTypes _types;
+
+			public GenericTypes(IGenericTypes types) => _types = types;
+
+			public ImmutableArray<TypeInfo> Get(IIdentity parameter)
+			{
+				var type   = _types.Get(parameter);
+				var result = Equals(type.Only(), Check) ? Type : type;
+				return result;
+			}
+		}
+
+		sealed class ImmutableLists : Collections
+		{
+			public ImmutableLists(RuntimeSerializers serializers, Contents contents) : base(serializers, contents) {}
+		}
+
+		sealed class Contents : ICollectionContents
+		{
+			readonly IInnerContentServices _contents;
+			readonly IEnumerators          _enumerators;
+
+			public Contents(IInnerContentServices contents, IEnumerators enumerators)
+			{
+				_contents    = contents;
+				_enumerators = enumerators;
+			}
+
+			public ISerializer Get(CollectionContentInput parameter)
+				=> new Serializer(Readers.Instance.Get(parameter.ItemType)(_contents, parameter.Item),
+				                  new EnumerableWriter(_enumerators, parameter.Item).Adapt());
+
+			sealed class Readers : Generic<IInnerContentServices, IReader, IReader>
+			{
+				public static Readers Instance { get; } = new Readers();
+
+				Readers() : base(typeof(Reader<>)) {}
+			}
+
+			sealed class Reader<T> : IReader
+			{
+				readonly IReader<Collection<T>> _reader;
+
+				[UsedImplicitly]
+				public Reader(IInnerContentServices services, IReader item)
+					: this(services.CreateContents<Collection<T>>(new CollectionInnerContentHandler(item, services))) {}
+
+				Reader(IReader<Collection<T>> reader) => _reader = reader;
+
+				public object Get(IFormatReader parameter) => _reader.Get(parameter).ToImmutableList();
+			}
+		}
+	}
+}

test/ExtendedXmlSerializer.Tests.ReportedIssues/Issue485Tests.cs

@@ -0,0 +1,25 @@
+using ExtendedXmlSerializer.Configuration;
+using ExtendedXmlSerializer.Tests.ReportedIssues.Support;
+using FluentAssertions;
+using System.Collections.Immutable;
+using Xunit;
+
+namespace ExtendedXmlSerializer.Tests.ReportedIssues
+{
+	public sealed class Issue485Tests
+	{
+		[Fact]
+		public void Verify()
+		{
+			var instance = new[] { 1, 2, 3, 4 }.ToImmutableList();
+
+			var serializer = new ConfigurationContainer().UseAutoFormatting()
+			                                             .UseOptimizedNamespaces()
+			                                             .EnableParameterizedContentWithPropertyAssignments()
+			                                             .Create()
+			                                             .ForTesting();
+
+			serializer.Cycle(instance).Should().BeEquivalentTo(instance);
+		}
+	}
+}