[dotnet-sdk-7.0.100-preview.5.22257.3] MaxInteger[T](System.Collections.Generic.IEnumerable`1[T])' violates the constraint of type parameter 'T' exception error

[Junjun-zhao]

Description

When launch some 3rd party desktop/asp.net apps such as nopCommerceNetCore against .NET 7 Preview 5 runtime, it failed with exception.

Reproduction Steps

The machine only has 7.0 installed. And DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX=2 is set.

1. Copy nopCommerceNetCore app to local machine.
2. Launch dotnet Nop.Web.exe.

Expected behavior

App will launch successful.

Actual behavior

Launch failed with below exception

Regression?

Verify Scenarios:

1). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.5.22257.3: Fail
2). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.5.22258.1: Fail
3). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.4.22252.9: Pass

Known Workarounds

No response

Configuration

Application Name: nopCommerceNetCore, blazorboilerplate, CastIt, grandnode, BlogSimpleAPI, NorthwindTraders, DevBetterWeb, piranha.core, Boilerplate
OS: Windows 10 RS5
CPU: X64
.NET Build Number: dotnet-sdk-7.0.100-preview.5.22257.3

App and App Source checking at : https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1537766

Github Link: https://github.com/nopSolutions/nopCommerce

Other information

Findings:

1. The apps are thrown exception on new methods, like MaxInteger(), MaxtFloat(), which are not exist in previous version:
   
2. The exception is thrown from MethodInfo.MakeGeneric method.
3. All these apps are using AutoMapper , and when debuging with AutoMapper , we get below exception:

System.ArgumentException
  HResult=0x80070057
  Message=GenericArguments[0], 'Nop.Web.Framework.Models.BaseNopModel', on 'T MaxInteger[T](System.Collections.Generic.IEnumerable`1[T])' violates the constraint of type 'T'.
  Source=System.Private.CoreLib
  StackTrace:
   at System.RuntimeType.ValidateGenericArguments(MemberInfo definition, RuntimeType[] genericArguments, Exception e)
   at System.Reflection.RuntimeMethodInfo.MakeGenericMethod(Type[] methodInstantiation)
   at AutoMapper.TypeDetails.<>c__DisplayClass28_1.<BuildPublicNoArgExtensionMethods>b__10(MethodInfo extensionMethod) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 161
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Linq.Enumerable.ConcatIterator`1.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__227`3.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.HashSet`1.UnionWith(IEnumerable`1 other)
   at System.Linq.Enumerable.UnionIterator`1.FillSet()
   at System.Linq.Enumerable.UnionIterator`1.ToArray()
   at AutoMapper.TypeDetails.BuildPublicNoArgExtensionMethods(IEnumerable`1 sourceExtensionMethodSearch) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 148
   at AutoMapper.TypeDetails..ctor(Type type, ProfileMap config) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 34
   at AutoMapper.ProfileMap.TypeDetailsFactory(Type type) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 101
   at AutoMapper.Internal.LockingConcurrentDictionary`2.<>c__DisplayClass2_1.<.ctor>b__1() in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\Internal\LockingConcurrentDictionary.cs:line 15
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at AutoMapper.Internal.LockingConcurrentDictionary`2.GetOrAdd(TKey key) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\Internal\LockingConcurrentDictionary.cs:line 18
   at AutoMapper.ProfileMap.CreateTypeDetails(Type type) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 99
   at AutoMapper.TypeMapFactory.CreateTypeMap(Type sourceType, Type destinationType, ProfileMap options, Boolean isReverseMap) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeMapFactory.cs:line 15
   at AutoMapper.ProfileMap.BuildTypeMap(IConfigurationProvider configurationProvider, ITypeMapConfiguration config) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 130
   at AutoMapper.ProfileMap.Register(IConfigurationProvider configurationProvider) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 107
   at AutoMapper.MapperConfiguration.Seal() in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 236
   at AutoMapper.MapperConfiguration..ctor(MapperConfigurationExpression configurationExpression) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 50
   at AutoMapper.MapperConfiguration..ctor(Action`1 configure) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 54
   at Nop.Core.Infrastructure.NopEngine.AddAutoMapper() in F:\nopCommerce\src\Libraries\Nop.Core\Infrastructure\NopEngine.cs:line 72
   at Nop.Core.Infrastructure.NopEngine.ConfigureServices(IServiceCollection services, IConfiguration configuration) in F:\nopCommerce\src\Libraries\Nop.Core\Infrastructure\NopEngine.cs:line 127
   at Nop.Web.Framework.Infrastructure.Extensions.ServiceCollectionExtensions.ConfigureApplicationServices(IServiceCollection services, WebApplicationBuilder builder) in F:\nopCommerce\src\Presentation\Nop.Web.Framework\Infrastructure\Extensions\ServiceCollectionExtensions.cs:line 90
   at Program.<Main>$(String[] args) in F:\nopCommerce\src\Presentation\Nop.Web\Program.cs:line 14

  This exception was originally thrown at this call stack:
    System.Reflection.RuntimeMethodInfo.MakeGenericMethod(System.Type[])

Inner Exception 1:
VerificationException: Method System.Linq.Enumerable.MaxInteger: type argument 'Nop.Web.Framework.Models.BaseNopModel' violates the constraint of type parameter 'T'.

@dotnet-actwx-bot @dotnet/compat

Tagging subscribers to this area: @dotnet/area-system-linq
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

When launch the nopCommerceNetCore against .NET 7 Preview 5 runtime, it failed to launch with exception.

Reproduction Steps

The machine only has 7.0 installed. And DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX=2 is set.

1. Copy nopCommerceNetCore app to local machine.
2. Launch dotnet Nop.Web.exe.

Expected behavior

App will launch successful.

Actual behavior

Launch failed with below exception

Regression?

Verify Scenarios:

1). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.5.22257.3: Fail
2). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.5.22258.1: Fail
3). Windows10 RS5 x64+dotnet-sdk-7.0.100-preview.4.22252.9: Pass

Known Workarounds

No response

Configuration

Application Name: nopCommerceNetCore, blazorboilerplate, CastIt, grandnode, BlogSimpleAPI
OS: Windows 10 RS5
CPU: X64
.NET Build Number: dotnet-sdk-7.0.100-preview.5.22257.3

App and App Source checking at : https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1537766

Other information

Findings:

1. The apps are thrown exception on new methods, like MaxInteger(), MaxtFloat(), which are not exist in previous version:
   
2. The exception is thrown from MethodInfo.MakeGeneric method.
3. All these apps are using AutoMapper , and when debuging with AutoMapper , we get below exception:

System.ArgumentException
  HResult=0x80070057
  Message=GenericArguments[0], 'Nop.Web.Framework.Models.BaseNopModel', on 'T MaxInteger[T](System.Collections.Generic.IEnumerable`1[T])' violates the constraint of type 'T'.
  Source=System.Private.CoreLib
  StackTrace:
   at System.RuntimeType.ValidateGenericArguments(MemberInfo definition, RuntimeType[] genericArguments, Exception e)
   at System.Reflection.RuntimeMethodInfo.MakeGenericMethod(Type[] methodInstantiation)
   at AutoMapper.TypeDetails.<>c__DisplayClass28_1.<BuildPublicNoArgExtensionMethods>b__10(MethodInfo extensionMethod) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 161
   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
   at System.Linq.Enumerable.ConcatIterator`1.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__227`3.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Collections.Generic.HashSet`1.UnionWith(IEnumerable`1 other)
   at System.Linq.Enumerable.UnionIterator`1.FillSet()
   at System.Linq.Enumerable.UnionIterator`1.ToArray()
   at AutoMapper.TypeDetails.BuildPublicNoArgExtensionMethods(IEnumerable`1 sourceExtensionMethodSearch) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 148
   at AutoMapper.TypeDetails..ctor(Type type, ProfileMap config) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeDetails.cs:line 34
   at AutoMapper.ProfileMap.TypeDetailsFactory(Type type) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 101
   at AutoMapper.Internal.LockingConcurrentDictionary`2.<>c__DisplayClass2_1.<.ctor>b__1() in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\Internal\LockingConcurrentDictionary.cs:line 15
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at AutoMapper.Internal.LockingConcurrentDictionary`2.GetOrAdd(TKey key) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\Internal\LockingConcurrentDictionary.cs:line 18
   at AutoMapper.ProfileMap.CreateTypeDetails(Type type) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 99
   at AutoMapper.TypeMapFactory.CreateTypeMap(Type sourceType, Type destinationType, ProfileMap options, Boolean isReverseMap) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\TypeMapFactory.cs:line 15
   at AutoMapper.ProfileMap.BuildTypeMap(IConfigurationProvider configurationProvider, ITypeMapConfiguration config) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 130
   at AutoMapper.ProfileMap.Register(IConfigurationProvider configurationProvider) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\ProfileMap.cs:line 107
   at AutoMapper.MapperConfiguration.Seal() in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 236
   at AutoMapper.MapperConfiguration..ctor(MapperConfigurationExpression configurationExpression) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 50
   at AutoMapper.MapperConfiguration..ctor(Action`1 configure) in F:\AutoMapper-10.1.1\AutoMapper-10.1.1\src\AutoMapper\MapperConfiguration.cs:line 54
   at Nop.Core.Infrastructure.NopEngine.AddAutoMapper() in F:\nopCommerce\src\Libraries\Nop.Core\Infrastructure\NopEngine.cs:line 72
   at Nop.Core.Infrastructure.NopEngine.ConfigureServices(IServiceCollection services, IConfiguration configuration) in F:\nopCommerce\src\Libraries\Nop.Core\Infrastructure\NopEngine.cs:line 127
   at Nop.Web.Framework.Infrastructure.Extensions.ServiceCollectionExtensions.ConfigureApplicationServices(IServiceCollection services, WebApplicationBuilder builder) in F:\nopCommerce\src\Presentation\Nop.Web.Framework\Infrastructure\Extensions\ServiceCollectionExtensions.cs:line 90
   at Program.<Main>$(String[] args) in F:\nopCommerce\src\Presentation\Nop.Web\Program.cs:line 14

  This exception was originally thrown at this call stack:
    System.Reflection.RuntimeMethodInfo.MakeGenericMethod(System.Type[])

Inner Exception 1:
VerificationException: Method System.Linq.Enumerable.MaxInteger: type argument 'Nop.Web.Framework.Models.BaseNopModel' violates the constraint of type parameter 'T'.

@dotnet-actwx-bot @dotnet/compat

Author:	Junjun-zhao
Assignees:	-
Labels:	area-System.Linq
Milestone:	-

[stephentoub]

I haven't debugged through it yet, but this looks like a bug in Automapper (or how it's being used by the consuming app) reflecting over private APIs on Enumerable and finding one it wasn't expecting. Assuming that's case, this isn't something to fix in runtime but rather in those consumers.

This issue has been marked needs-author-action and may be missing some important information.

This issue has been automatically marked no-recent-activity because it has not had any activity for 14 days. It will be closed if no further activity occurs within 14 more days. Any new comment (by anyone, not necessarily the author) will remove no-recent-activity.

[Junjun-zhao]

@stephentoub We verified and still repro this issue with build dotnet-sdk-7.0.100-preview.5.22274.1, do you have any update for this issue? Thanks.

[stephentoub]

I wasn't successful in setting up a repro. I continue to believe it's a bug in the app/library using private reflection incorrectly rather than a bug in .NET 7.

[Junjun-zhao]

@stephentoub Thanks for your update. We will prepare an repro and share with you. Could you please have an look as this bug affect 5 apps in our Lab and may affect more in real world. Thanks.