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AutoMapper issue after upgrading to .NET 7

While upgrading a .NET Core 5 application to .NET 7 I encountered the following issue; when I tried to run the application it failed with the following error message:

Method System.Linq.Enumerable.MaxFloat: type argument 'System.Int32' violates the constraint of type parameter 'T'.

And for completeness, the full stack trace:

at System.RuntimeType.ValidateGenericArguments(MemberInfo definition, RuntimeType[] genericArguments, Exception e) at System.Reflection.RuntimeMethodInfo.MakeGenericMethod(Type[] methodInstantiation) at AutoMapper.Internal.TypeDetails.<>c__DisplayClass25_1.b__10(MethodInfo extensionMethod) at System.Linq.Enumerable.WhereSelectArrayIterator2.MoveNext() at System.Linq.Enumerable.ConcatIterator1.MoveNext() at System.Linq.Enumerable.d__2313.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()
at System.Linq.Enumerable.UnionIterator1.MoveNext() at System.Linq.Enumerable.ConcatIterator1.MoveNext() at AutoMapper.Internal.TypeDetails.PossibleNames() at AutoMapper.Internal.TypeDetails.GetMember(String name) at AutoMapper.Configuration.Conventions.DefaultName.GetMatchingMemberInfo(TypeDetails sourceTypeDetails, Type destType, Type destMemberType, String nameToSearch) at AutoMapper.Configuration.Conventions.ParentSourceToDestinationNameMapper.GetMatchingMemberInfo(TypeDetails sourceTypeDetails, Type destType, Type destMemberType, String nameToSearch) at AutoMapper.Configuration.Conventions.DefaultMember.MapDestinationPropertyToSource(ProfileMap options, TypeDetails sourceTypeDetails, Type destType, Type destMemberType, String nameToSearch, List1 resolvers, IMemberConfiguration parent, Boolean isReverseMap) at AutoMapper.Configuration.Conventions.MemberConfiguration.MapDestinationPropertyToSource(ProfileMap options, TypeDetails sourceType, Type destType, Type destMemberType, String nameToSearch, List1 resolvers, Boolean isReverseMap) at AutoMapper.Configuration.Conventions.NameSplitMember.MapDestinationPropertyToSource(ProfileMap options, TypeDetails sourceType, Type destType, Type destMemberType, String nameToSearch, List1 resolvers, IMemberConfiguration parent, Boolean isReverseMap) at AutoMapper.Configuration.Conventions.MemberConfiguration.MapDestinationPropertyToSource(ProfileMap options, TypeDetails sourceType, Type destType, Type destMemberType, String nameToSearch, List1 resolvers, Boolean isReverseMap) at AutoMapper.ProfileMap.MapDestinationPropertyToSource(TypeDetails sourceTypeDetails, Type destType, Type destMemberType, String destMemberName, List1 members, Boolean reverseNamingConventions) at AutoMapper.TypeMap..ctor(Type sourceType, Type destinationType, ProfileMap profile, Boolean isReverseMap) at AutoMapper.ProfileMap.BuildTypeMap(IGlobalConfiguration configurationProvider, ITypeMapConfiguration config) at AutoMapper.ProfileMap.Register(IGlobalConfiguration configurationProvider) at AutoMapper.MapperConfiguration.Seal() at AutoMapper.MapperConfiguration..ctor(MapperConfigurationExpression configurationExpression) at Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions.<>c.<AddAutoMapperClasses>b__12_2(IServiceProvider sp) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSite(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope) at Microsoft.Extensions.DependencyInjection.ServiceProvider.CreateServiceAccessor(Type serviceType) at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope) at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions.<>c.<AddAutoMapperClasses>b__12_3(IServiceProvider sp) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitDisposeCache(ServiceCallSite transientCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSite(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitDisposeCache(ServiceCallSite transientCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSite(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor2.VisitCallSiteMain(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitRootCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScopeCache(ServiceCallSite callSite, RuntimeResolverContext context) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2.VisitCallSite(ServiceCallSite callSite, TArgument argument) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.Resolve(ServiceCallSite callSite, ServiceProviderEngineScope scope) at Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine.<>c__DisplayClass2_0.b__0(ServiceProviderEngineScope scope) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType, ServiceProviderEngineScope serviceProviderEngineScope)
at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)

It is not exactly clear to me what this error exactly means but it is certainly some of the reflection magic inside AutoMapper that is going haywire.

Luckily a fix was already available. I updated to the latest Automapper version (12.0.1 at the moment of writing) and the issue disappeared.

On to the next…

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