Issues

• Concurrent XmlSerializer.Deserialize with separate XmlNodeReaders over a shared XmlDocument can corrupt NameTable and spin indefinitely

  area-Serializationuntriaged
  dotnet/runtime#136227 · Filter by author helderman opened on Oct 21, 2026

• DataContractSerializer roots collectible AssemblyLoadContext when serializing List<T> of a collectible type

  area-Serializationuntriaged
  dotnet/runtime#135223 · Filter by author hknielsen opened on Oct 5, 2026
  1

• Fix NRE in XML SOAP serialization: array reference among unmapped members

  area-Serializationcommunity-contribution
  Unread
  dotnet/runtime#133689·sstronin opened Sep 11, 2026 · Updated Oct 2, 2026
  1

• XmlSerializer: reflection-based reader returns null for a nil collection root where the IL-generating reader returns empty

  area-Serialization
  dotnet/runtime#132762 · Filter by author StephenMolloy opened on Aug 25, 2026 · 12.0.0

• XmlSerializer: LIFO collections would round-trip inverted; element order needs deciding before support lands

  area-Serialization
  dotnet/runtime#132761 · Filter by author StephenMolloy opened on Aug 25, 2026 · Future

• XmlSerializer: reflection-based reader cannot deserialize into any readonly collection field

  area-Serialization
  dotnet/runtime#132357 · Filter by author StephenMolloy opened on Aug 15, 2026 · Future
  1

• [API Proposal]: Handle union as a xsd:choice in XmlSerializer as a type safe exhaustive alternative

  api-suggestionarea-Serializationuntriaged
  dotnet/runtime#132162 · Filter by author Micovec opened on Aug 11, 2026 · Future

• Test failure: DataContractSerializerTests.DCS_BasicPerSerializerRoundTripAndCompare_InheritedFromIList

  area-Serializationblocking-clean-ci-optionaluntriaged
  dotnet/runtime#129107 · Filter by author VincentBu opened on Jun 8, 2026

• Suspicious code fragments

  area-Serialization
  dotnet/runtime#129042 · Filter by author NikiPn opened on Jun 5, 2026 · Future
  5

• ImporterTests.Import is too brittle and breaks when runtime patch version grows past 10

  area-Serialization
  dotnet/runtime#128990 · Filter by author svick opened on Jun 4, 2026 · Future
  1

• [Microsoft.XmlSerializer.Generator] Throws on internal types even when generated assembly is in the same scope

  area-Serializationuntriaged
  dotnet/runtime#125968 · Filter by author Vwwork opened on Mar 23, 2026

• DataContractSerializer: Implemented to support parameter-less (de)serialization event methods

  area-Serializationcommunity-contribution
  Unread
  dotnet/runtime#125922·Takym opened Mar 22, 2026 · Updated Jul 20, 2026
  6

• Version for package Microsoft.XmlSerializer.Generator could not be resolved.

  area-Serializationuntriaged
  dotnet/runtime#122719 · Filter by author alex-jitbit opened on Dec 24, 2025
  3

• Microsoft.XmlSerializer.Generator not supported DateOnly and TimeOnly

  area-Serializationuntriaged
  dotnet/runtime#122712 · Filter by author kronic opened on Dec 23, 2025
  1

• Microsoft.XmlSerializer.Generator broken on .NET 10.0 RC

  area-Serializationregression-from-last-release
  dotnet/runtime#120734 · Filter by author MarkpageBxl opened on Oct 15, 2025 · 10.0.0
  5

• System.Runtime.Serialization.DataContracts docs for .NET 10.0 APIs

  area-Serializationdocumentation
  dotnet/runtime#120509 · Filter by author ericstj opened on Oct 7, 2025 · Future

• Serializer test exclusions

  area-Serializationtest-enhancement
  dotnet/runtime#118688 · Filter by author StephenMolloy opened on Aug 13, 2025 · Future

• DataContractSerializerTest.DCS_KnownSerializableTypes_CultureInfo - CultureInfo is not serializable

  area-Serializationdisabled-test
  dotnet/runtime#118358 · Filter by author StephenMolloy opened on Aug 4, 2025 · Future
  1

• DataContractSerializer serializing an IXmlSerializable doesn't support XmlWriter.WriteValue(object)

  area-Serialization
  dotnet/runtime#117842 · Filter by author mconnew opened on Jul 18, 2025 · Future

• Error: System.ArgumentException: Identifier is not CLS-compliant. (Parameter 'ident')

  area-Serialization
  dotnet/runtime#110435 · Filter by author theolivenbaum opened on Dec 5, 2024 · Future

• Support parameter-less event methods in DataContractSerializer (without a StreamingContext parameter)

  area-Serializationbinaryformatter-migration
  dotnet/runtime#109264 · Filter by author Takym opened on Oct 27, 2024 · Future
  3

• Microsoft.XmlSerializer.Generator added *.XmlSerialization.all to nuget package which causes CS0436

  area-Serialization
  dotnet/runtime#107288 · Filter by author TiltonJH opened on Sep 3, 2024 · 12.0.0
  1

• NativeAOT and XmlSerializer

  area-Serialization
  dotnet/runtime#106580 · Filter by author danielo-unity3d opened on Aug 18, 2024 · 12.0.0
  12

• Microsoft.XmlSerializer.Generator use of Assembly.LoadFile

  area-Serialization
  dotnet/runtime#102245 · Filter by author filipnavara opened on May 15, 2024 · Future
  1

• IXmlSerializable makes XmlSerializer Deserialize creates instance of base class instead of derived class

  area-Serialization
  dotnet/runtime#101654 · Filter by author MMariusch opened on Apr 28, 2024 · Future
  8