IdentityServer4与AutoMapper 10.1.1在.NET7环境下的异常问题

问题1：访问端点触发ArgumentException异常 #

使用最后免费版IdentityServer4、AutoMapper 10.1.1与.NET7时，访问/.well-known/openid-configuration端点会抛出如下ArgumentException异常：

ArgumentException: GenericArguments[0], 'System.Char', on 'T MaxFloat[T](System.Collections.Generic.IEnumerable`1[T])' violates the constraint of type 'T'.
System.RuntimeType.ValidateGenericArguments(MemberInfo definition, RuntimeType[] genericArguments, Exception e)
System.Reflection.RuntimeMethodInfo.MakeGenericMethod(Type[] methodInstantiation)
AutoMapper.TypeDetails+<>c__DisplayClass28_1.<BuildPublicNoArgExtensionMethods>b__10(MethodInfo extensionMethod)
System.Linq.Enumerable+WhereSelectArrayIterator<TSource, TResult>.MoveNext()
System.Linq.Enumerable+ConcatIterator<TSource>.MoveNext()
System.Linq.Enumerable.SelectManyIterator<TSource, TCollection, TResult>(IEnumerable<TSource> source, Func<TSource, IEnumerable<TCollection>> collectionSelector, Func<TSource, TCollection, TResult> resultSelector)+MoveNext()
System.Linq.Enumerable+WhereSelectEnumerableIterator<TSource, TResult>.MoveNext()
System.Collections.Generic.HashSet<T>.UnionWith(IEnumerable<T> other)
System.Linq.Enumerable+UnionIterator<TSource>.FillSet()
System.Linq.Enumerable+UnionIterator<TSource>.ToArray()
AutoMapper.TypeDetails.BuildPublicNoArgExtensionMethods(IEnumerable<MethodInfo> sourceExtensionMethodSearch)
AutoMapper.TypeDetails..ctor(Type type, ProfileMap config)
AutoMapper.ProfileMap.TypeDetailsFactory(Type type)
AutoMapper.Internal.LockingConcurrentDictionary<TKey, TValue>+<>c__DisplayClass2_1.<.ctor>b__1()
System.Lazy<T>.ViaFactory(LazyThreadSafetyMode mode)
System.Lazy<T>.ExecutionAndPublication(LazyHelper executionAndPublication, bool useDefaultConstructor)
System.Lazy<T>.CreateValue()
AutoMapper.Internal.LockingConcurrentDictionary<TKey, TValue>.GetOrAdd(TKey key)
AutoMapper.ProfileMap.CreateTypeDetails(Type type)
AutoMapper.TypeMapFactory.CreateTypeMap(Type sourceType, Type destinationType, ProfileMap options, bool isReverseMap)
AutoMapper.ProfileMap.BuildTypeMap(IConfigurationProvider configurationProvider, ITypeMapConfiguration config)
AutoMapper.ProfileMap.Register(IConfigurationProvider configurationProvider)
AutoMapper.MapperConfiguration.Seal()
AutoMapper.MapperConfiguration..ctor(MapperConfigurationExpression configurationExpression)
AutoMapper.MapperConfiguration..ctor(Action<IMapperConfigurationExpression> configure)
IdentityServer4.EntityFramework.Mappers.IdentityResourceMappers..cctor()
// Put your source/destination types here

该异常是AutoMapper的已知问题，在其更高版本中已修复，但IdentityServer4对AutoMapper的版本限制为≥10且＜11，无法直接升级到修复版本。

问题2：升级AutoMapper触发MissingMethodException异常 #

尝试将AutoMapper升级到10.x系列的更高版本时，会抛出如下MissingMethodException异常：

System.MissingMethodException: Method not found: '!2 AutoMapper.IMappingExpressionBase`3.ConstructUsing(System.Linq.Expressions.Expression`1<System.Func`2<!0,!1>>)'.
   at IdentityServer4.EntityFramework.Mappers.ClientMapperProfile..ctor()
   at System.RuntimeType.CreateInstanceOfT()

内容的提问来源于stack exchange，提问作者Karim Moghnieh