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MapsterMapper

3 indexed repositories · View on GitHub

Mapster
A fast, fun and stimulating object to object Mapper

C# · 5169 stars
Mapster.EFCore
EF Core plugin for Mapster

C# · 8 stars
Mapster.DependencyInjection
Dependency Injection supports for Mapster

C# · 3 stars

Beginner friendly Everything

Open All

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

improvement

Difficulty 3/5 1-2 days Newbie friendliness 65/100

MapsterMapper/Mapster#1020 · 3 comments · Opened Sep 15, 2026
Mapster.Tool - PropertySettingBuilder.Map(member, mapFunc, targetPropertyName) method is not working as expected! Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

MapsterMapper/Mapster#1017 · 6 comments · Opened Sep 2, 2026
"IgnoreIf" doesn't work for records Open

Difficulty 3/5 1-2 days Newbie friendliness 57/100

MapsterMapper/Mapster#1007 · 5 comments · Opened Aug 12, 2026
Behaviour of `IMapper.Map(src, dst)` differs from AutoMapper Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

MapsterMapper/Mapster#1005 · Opened Aug 7, 2026
Mapster throws ArgumentNullException when mapping null collection property with LINQ method (Select), unlike AutoMapper Open

improvement NullPropagation features

Difficulty 3/5 1-2 days Newbie friendliness 65/100

MapsterMapper/Mapster#1004 · 8 comments · Opened Aug 5, 2026
.NET Matrix Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

MapsterMapper/Mapster#1003 · Opened Jul 31, 2026
Unable to map nullable primitive types (string? to bool?) using custom MapWith delegate Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 50/100

MapsterMapper/Mapster#992 · 9 comments · Opened Jun 25, 2026
Mapping fails when source type is nullable and source selector contains ternary conditional since 10.0.7 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

MapsterMapper/Mapster#987 · 1 comment · Opened Jun 19, 2026
Question:Propert Type convertor for just one or some Type Mapping Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

MapsterMapper/Mapster#983 · 1 comment · Opened Jun 10, 2026
[FeatureRequest] Need `IgnoreDefaultValues` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#982 · Opened Jun 9, 2026
Flattening ignores explicit type mapping rules Open

improvement

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MapsterMapper/Mapster#980 · 5 comments · Opened May 27, 2026
Ignore in an Inherited Object Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MapsterMapper/Mapster#953 · 6 comments · Opened May 20, 2026
DestinationTransform.EmptyCollectionIfNull overrides explicit null mapping Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

MapsterMapper/Mapster#952 · 3 comments · Opened May 20, 2026
AllowImplicitDestinationInheritance(true) Combines all settings, including those that are not recommended for use by child type Open

bug configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MapsterMapper/Mapster#947 · 23 comments · Opened May 15, 2026
Does Mapster has a way to explicitly map the same object while false ShallowCopyForSameType? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MapsterMapper/Mapster#938 · 19 comments · Opened Apr 28, 2026
Conditional mapping with nested adapters fails for one type but works for another identical pattern Open

configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MapsterMapper/Mapster#926 · 9 comments · Opened Apr 22, 2026
Feature request: Duplicated mapper configuration Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 48/100

MapsterMapper/Mapster#922 · 1 comment · Opened Apr 20, 2026
[MapToTarget] [10.0.7] Mutable type not mutate when SourceType == DestinationType Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MapsterMapper/Mapster#918 · 6 comments · Opened Apr 17, 2026
Possible regression / changed behavior in v10: `CasesCount` no longer maps from `Cases.Count` automatically Open

feature request

Difficulty 3/5 1-2 days Newbie friendliness 30/100

MapsterMapper/Mapster#915 · 4 comments · Opened Apr 8, 2026
How migrate AutoMapper to Mapster - ConvertUsing Open

configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MapsterMapper/Mapster#910 · 5 comments · Opened Apr 1, 2026
Mapping an object with getter only properties seems to be broken in v10.0.6 (works as expected in 7.4.0) Open

configuration problem

Difficulty 3/5 1-2 days Newbie friendliness 50/100

MapsterMapper/Mapster#900 · 9 comments · Opened Mar 27, 2026
Regression in v10 - Forced Update of Required Property [MapToTarget] Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MapsterMapper/Mapster#899 · 2 comments · Opened Mar 26, 2026
[Improvement] - Add by default using optimum constructor selector to unify the choice of constructor for types Open

improvement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

MapsterMapper/Mapster#892 · 6 comments · Opened Mar 25, 2026
[Tests] Local Testing of single Mapster Projects fails for SolutionDir is not always set when building a project directly via dotnet test Open

improvement

MapsterMapper/Mapster#848 · 10 comments · 1 assignee · Opened Jan 14, 2026
[Docs][CI] Ensure docfx links stay valid, prepare future xml API docs options, keep docs simple maintainable and introduce CI integration for this Open

docs improvement

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#846 · 6 comments · Opened Jan 5, 2026
Unification build Properties Open

build improvement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MapsterMapper/Mapster#843 · 1 reaction · Opened Dec 31, 2025
Add an overload to the Adapt method to allow using a local, temporary configuration. Open

config features feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MapsterMapper/Mapster#833 · 5 comments · Opened Dec 6, 2025
Adapt(source, destination) does not work when destination is a C# record Open

improvement need Docs modify

Difficulty 3/5 1-2 days Newbie friendliness 25/100

MapsterMapper/Mapster#832 · 45 comments · Opened Dec 3, 2025
[Enhancement][CI] Add Branch Protection, Code Analysis and Project board Open

improvement

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#831 · 20 comments · Opened Dec 1, 2025
Polymorphic mapping with collections maps only base class properties Open

bug configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MapsterMapper/Mapster#793 · 11 comments · Opened Apr 15, 2025
BuildAdapter().AdaptToType<T>() does not include all expected properties when source is using inheritance Open

bug configuration problem waiting for info

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MapsterMapper/Mapster#776 · 6 comments · Opened Feb 21, 2025
wish to add the ability to ignore a copy of a property when it has a specific value. For example, null, empty string, empty collection Open

Ignore features improvement waiting for info

Difficulty 5/5 Over a week Newbie friendliness 30/100

MapsterMapper/Mapster#747 · 2 comments · Opened Dec 31, 2024
Tweaking null propagation easily Open

help wanted improvement

Difficulty 5/5 Over a week Newbie friendliness 20/100

MapsterMapper/Mapster#740 · 3 comments · Opened Dec 11, 2024
When using TypeAdapterConfig.GlobalSettings.Default.IgnoreNullValues(true), it causes the Mapper function to be called twice. Open

waiting for info

MapsterMapper/Mapster#737 · 5 comments · 1 assignee · Opened Nov 25, 2024
Map<TSource, TDestination> should have class constraint for TDestination Open

configuration problem

Difficulty 3/5 1-2 days Newbie friendliness 42/100

MapsterMapper/Mapster#736 · Opened Nov 19, 2024
Hi, does Mapster cache class information? Is there a possibility of memory leakage when reloading classes using ALC Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

MapsterMapper/Mapster#727 · Opened Sep 5, 2024
Inheritance and scanning assembly for IRegister. Open

improvement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

MapsterMapper/Mapster#726 · 5 comments · 2 reactions · Opened Sep 4, 2024
Unable to map classes with generics Open

configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 25/100

MapsterMapper/Mapster#724 · 1 comment · Opened Aug 23, 2024
Inspecting property maps for validation and copying of metadata Open

feature request ProjectToType features

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#721 · Opened Jul 27, 2024
Misleading exception message for ctor argument names Open

bug configuration problem

Difficulty 4/5 3-5 days Newbie friendliness 35/100

MapsterMapper/Mapster#719 · 6 comments · Opened Jun 21, 2024
Separate namespaces to avoid ambiguous references Open

improvement

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#705 · Opened May 8, 2024
Mapping must be called using ServiceAdapter Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

MapsterMapper/Mapster#704 · 3 comments · Opened May 6, 2024
How can I obtain the changed field values after mapping two entities? Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

MapsterMapper/Mapster#692 · Opened Apr 5, 2024
mapster is missing NuGet package README file Open

improvement

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

MapsterMapper/Mapster#675 · 1 comment · Opened Feb 9, 2024
Can't use conditional mapping with different types of source field Open

help wanted improvement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

MapsterMapper/Mapster#673 · 3 comments · Opened Feb 1, 2024
Generic IEnumerator not disposed Open

improvement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MapsterMapper/Mapster#667 · Opened Dec 7, 2023
Compile doesn't throw exceptions while configuring with attributes Open

bug configuration problem

Difficulty 3/5 1-2 days Newbie friendliness 45/100

MapsterMapper/Mapster#666 · Opened Nov 30, 2023
dotnet mapper ... -p generates code that can't be compiled. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

MapsterMapper/Mapster#665 · Opened Nov 26, 2023
Source Generators with IMapper Interface Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

MapsterMapper/Mapster#622 · 12 comments · 3 reactions · Opened Aug 19, 2023
Add nullable annotations Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

MapsterMapper/Mapster.DependencyInjection#6 · Opened Aug 9, 2023

MapsterMapper

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