.Net 6 fails with exception Multiple methods found with 2 parameter(s)

[RobertLivermore]

There is a reflection exception thrown from AgileObjects.NetStandardPolyfills library. "Multiple methods found with 2 parameter(s)". The problem was introduced when updating to net6. Not sure what the right combination of nuget packages to use to get this to work.

I created a sample in dotnetfiddler to demonstrate
Fiddlier Example

using System;
using System.Collections.Generic;
using AgileObjects.AgileMapper.Members;
using Agile = AgileObjects.AgileMapper;
#nullable enable

public class Program
{
	public static void Main()
	{
		var mapper = Agile.Mapper.CreateNew();
		mapper.WhenMapping
			.FromDictionaries
			.ToANew<Doctor>()
			.PassExceptionsTo(LogMappingException);

		var readerResult = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
		{
			{"Name", "Steve"},
			{"PhoneNumbers[0]", "01234 567890"},
			{"PhoneNumbers[1]" , "07890 654321"},
			{"PhoneNumbers[2]",  "01234 987654"},
			{"Specialties[0]Id",  123},
			{"Specialties[0]Name",  "Emergency Medicine"},
			{"Specialties[1]Id",  456},
			{"Specialties[1]Name",  "Critical Care"},
		};

		 Console.WriteLine( mapper.GetPlanFor<IDictionary<string, object?>>().ToANew<Doctor>());
		var doctor = mapper.Map(readerResult).ToANew<Doctor>();

		Console.Write(doctor);
		Console.ReadLine();
	}
	static void LogMappingException(IMappingExceptionData<IDictionary<string, object?>, Doctor> problem)
	{
		Console.WriteLine(problem);
	}	
}
public class Doctor
{
    public string? Name { get; set; }
    public string[] PhoneNumbers { get; set; }
    public System.Collections.Generic.IReadOnlyCollection<Specialty>? Specialties { get; set; }
}

public class Specialty
{
    public int Id { get; set; }
    public string? Name { get; set; }
}

Stack Trace

Unhandled exception. System.TypeInitializationException: The type initializer for 'AgileObjects.AgileMapper.DataSources.DictionaryEntryVariablePair' threw an exception.
 ---> System.Reflection.AmbiguousMatchException: Multiple methods found with 2 parameter(s)
   at AgileObjects.NetStandardPolyfills.MethodExtensionsPolyfill.WithParameterCount(IEnumerable`1 methods, Int32 parameterCount)
   at AgileObjects.NetStandardPolyfills.MethodExtensionsPolyfill.GetPublicStaticMethod(Type type, String name, Int32 parameterCount)
   at AgileObjects.AgileMapper.DataSources.DictionaryEntryVariablePair..cctor()
   --- End of inner exception stack trace ---
   at AgileObjects.AgileMapper.DataSources.DictionaryEntryVariablePair.GetMatchingKeyAssignment(Expression targetMemberKey)
   at AgileObjects.AgileMapper.DataSources.DictionaryEntryVariablePair.GetMatchingKeyAssignment()
   at AgileObjects.AgileMapper.DataSources.DictionaryEntryDataSource.GetMatchingKeyExistsTest()
   at AgileObjects.AgileMapper.DataSources.DictionaryEntryDataSource.FinalisePopulationBranch(Expression alternatePopulation, IDataSource nextDataSource, IMemberMapperData mapperData)
   at AgileObjects.AgileMapper.Members.Population.MemberPopulator.GetPopulation()
   at AgileObjects.AgileMapper.ObjectPopulation.ComplexTypes.MultiStatementPopulationExpressionFactory.GetPopulationExpressionsFor(IMemberPopulator memberPopulator, IObjectMappingData mappingData)+MoveNext()
   at AgileObjects.AgileMapper.ObjectPopulation.ComplexTypes.PopulationExpressionFactoryBase.GetPopulationsAndCallbacks(IObjectMappingData mappingData)+MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at AgileObjects.AgileMapper.ObjectPopulation.ComplexTypes.PopulationExpressionFactoryBase.AddPopulation(MappingCreationContext context)
   at AgileObjects.AgileMapper.ObjectPopulation.ComplexTypes.ComplexTypeMappingExpressionFactory.AddObjectPopulation(MappingCreationContext context)
   at AgileObjects.AgileMapper.ObjectPopulation.MappingExpressionFactoryBase.<>c__DisplayClass11_0.<AddPopulationsAndCallbacks>b__0(MappingExpressionFactoryBase factory, MappingCreationContext ctx)
   at AgileObjects.AgileMapper.ObjectPopulation.MappingExpressionFactoryBase.AddPopulationsAndCallbacks[TArg](TArg argument, MappingCreationContext context, Action`2 mappingBodyPopulator)
   at AgileObjects.AgileMapper.ObjectPopulation.MappingExpressionFactoryBase.AddPopulationsAndCallbacks(MappingCreationContext context)
   at AgileObjects.AgileMapper.ObjectPopulation.MappingExpressionFactoryBase.Create(IObjectMappingData mappingData)
   at AgileObjects.AgileMapper.DataSources.ComplexTypeDataSource.Create(IObjectMappingData mappingData)
   at AgileObjects.AgileMapper.DataSources.Factories.Mapping.ComplexTypeMappingDataSourceFactory.CreateFor(IObjectMappingData mappingData)
   at AgileObjects.AgileMapper.DataSources.Factories.Mapping.MappingDataSourceSetFactory.CreateFor(IObjectMappingData mappingData)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMapperFactory.Create[TSource,TTarget](ObjectMappingData`2 mappingData)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingData`2.GetOrCreateMapper()
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMapperFactory.<>c__7`2.<GetOrCreateRoot>b__7_0(IRootMapperKey key)
   at AgileObjects.AgileMapper.Caching.ArrayCacheBase`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMapperFactory.GetOrCreateRoot[TSource,TTarget](ObjectMappingData`2 mappingData)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingData`2..ctor(TSource source, TTarget target, Nullable`1 elementIndex, Object elementKey, MappingTypes mappingTypes, IMappingContext mappingContext, IObjectMappingData declaredTypeMappingData, IObjectMappingData parent, Boolean createMapper)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingData`2..ctor(TSource source, TTarget target, Nullable`1 elementIndex, Object elementKey, MappingTypes mappingTypes, IMappingContext mappingContext, IObjectMappingData parent, Boolean createMapper)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingDataFactory.ForRootFixedTypes[TSource,TTarget](TSource source, TTarget target, MappingTypes mappingTypes, IMappingContext mappingContext, Boolean createMapper)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingDataFactory.ForRootFixedTypes[TSource,TTarget](TSource source, TTarget target, IMappingContext mappingContext, Boolean createMapper)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingDataFactory.ForRootFixedTypes[TSource,TTarget](IMappingContext mappingContext, Boolean createMapper)
   at AgileObjects.AgileMapper.ObjectPopulation.ObjectMappingDataFactory.ForRootFixedTypes[TSource,TTarget](IMappingContext mappingContext)
   at AgileObjects.AgileMapper.Api.PlanTargetSelector`1.GetMappingPlan[TTarget](IMappingContext planContext, Func`2 mappingDataFactory, ICollection`1 configurations)
   at AgileObjects.AgileMapper.Api.PlanTargetSelector`1.GetMappingPlan[TTarget](MappingRuleSet ruleSet, ICollection`1 configurations)
   at AgileObjects.AgileMapper.Api.PlanTargetSelector`1.ToANew[TResult](Expression`1[] configurations)
   at Program.Main()
Command terminated by signal 6

[SteveWilkes]

Thanks for letting me know about this - I discovered it recently myself and have a fix in the branch for the next release.

Cheers,

Steve

[RobertLivermore]

Thanks for the quick reply. What is the time frame for the next release? Or is there any alpha or beta releases to work with.

👍I like the AgileObject.Mapper better than Automapper because the AgileMapper expression tree throws better exceptions. Which are faster to debug and maintain. --Comparing dictionary Mapping between libraries. When AgileMapper throws exception I know which property failed, AutoMapper just gives a reflection error nearly impossible to find the failing property.

[SteveWilkes]

Thanks for the feedback - happy to know you're finding the project useful!

This issue is fixed as of v1.8.1, which is now available on NuGet. Cheers!

[RobertLivermore]

Tested v1.8.1. It works with net 6. A big thank you.

[SteveWilkes]

You're welcome! Cheers!