Issues

• Exception occured when map single object from EF Core entity class (with proxy)

  MapsterMapper/Mapster#1024 · Filter by author joko1189 opened on Oct 8, 2026
  1

• [Mapster Tool] Add support for global:: to disambiguate type names in generated mappers

  improvement
  MapsterMapper/Mapster#1020 · Filter by author BladeWise opened on Sep 15, 2026
  3

• Mapster.Tool - PropertySettingBuilder.Map(member, mapFunc, targetPropertyName) method is not working as expected!

  Bug

  MapsterMapper/Mapster#1017 · Filter by author atiyar opened on Sep 2, 2026
  6

• "IgnoreIf" doesn't work for records

  Bug

  MapsterMapper/Mapster#1007 · Filter by author MaximBusyrev opened on Aug 12, 2026
  5

• Behaviour of IMapper.Map(src, dst) differs from AutoMapper

  MapsterMapper/Mapster#1005 · Filter by author AntiGuideAkquinet opened on Aug 7, 2026

• Mapster throws ArgumentNullException when mapping null collection property with LINQ method (Select), unlike AutoMapper

  improvementNullPropagation features
  MapsterMapper/Mapster#1004 · Filter by author Brainman643 opened on Aug 5, 2026
  8

• .NET Matrix

  MapsterMapper/Mapster#1003 · Filter by author NikolayPianikov opened on Jul 31, 2026

• Unable to map nullable primitive types (string? to bool?) using custom MapWith delegate

  bug
  MapsterMapper/Mapster#992 · Filter by author vzalamea opened on Jun 25, 2026
  9

• Mapping fails when source type is nullable and source selector contains ternary conditional since 10.0.7

  bug
  MapsterMapper/Mapster#987 · Filter by author joeclarkpodium opened on Jun 19, 2026
  1

• Question:Propert Type convertor for just one or some Type Mapping

  MapsterMapper/Mapster#983 · Filter by author yeganehaym opened on Jun 10, 2026
  1

• [FeatureRequest] Need IgnoreDefaultValues

  MapsterMapper/Mapster#982 · Filter by author ahdung opened on Jun 9, 2026

• Flattening ignores explicit type mapping rules

  improvement
  MapsterMapper/Mapster#980 · Filter by author dcby opened on May 27, 2026
  5

• Ignore in an Inherited Object

  MapsterMapper/Mapster#953 · Filter by author Kaiwinta opened on May 20, 2026
  6

• DestinationTransform.EmptyCollectionIfNull overrides explicit null mapping

  MapsterMapper/Mapster#952 · Filter by author moikot opened on May 20, 2026
  3

• AllowImplicitDestinationInheritance(true) Combines all settings, including those that are not recommended for use by child type

  bugconfiguration problem
  MapsterMapper/Mapster#947 · Filter by author bill2004158 opened on May 15, 2026
  23

• Does Mapster has a way to explicitly map the same object while false ShallowCopyForSameType?

  MapsterMapper/Mapster#938 · Filter by author klabajo opened on Apr 28, 2026
  19

• Conditional mapping with nested adapters fails for one type but works for another identical pattern

  configuration problem
  MapsterMapper/Mapster#926 · Filter by author vamanpnayak opened on Apr 22, 2026
  9

• Feature request: Duplicated mapper configuration

  feature request
  MapsterMapper/Mapster#922 · Filter by author Lure5134 opened on Apr 20, 2026
  1

• [MapToTarget] [10.0.7] Mutable type not mutate when SourceType == DestinationType

  bug
  MapsterMapper/Mapster#918 · Filter by author Ultramund1 opened on Apr 17, 2026
  6

• Possible regression / changed behavior in v10: CasesCount no longer maps from Cases.Count automatically

  feature request
  MapsterMapper/Mapster#915 · Filter by author NikolayIT opened on Apr 8, 2026
  4

• How migrate AutoMapper to Mapster - ConvertUsing

  configuration problem
  MapsterMapper/Mapster#910 · Filter by author vk-git-hub opened on Apr 1, 2026
  5

• Mapping an object with getter only properties seems to be broken in v10.0.6 (works as expected in 7.4.0)

  configuration problem
  MapsterMapper/Mapster#900 · Filter by author ripebananas opened on Mar 27, 2026
  9

• Regression in v10 - Forced Update of Required Property [MapToTarget]

  bug
  MapsterMapper/Mapster#899 · Filter by author md-redwan-hossain opened on Mar 26, 2026
  2

• [Improvement] - Add by default using optimum constructor selector to unify the choice of constructor for types

  improvement
  MapsterMapper/Mapster#892 · Filter by author DocSvartz opened on Mar 25, 2026
  6

• [Tests] Local Testing of single Mapster Projects fails for SolutionDir is not always set when building a project directly via dotnet test

  improvement
  MapsterMapper/Mapster#848 · Filter by author DevTKSS opened on Jan 14, 2026
  10