Projecting Enum to Enum in another assembly throws an exception

[nholling]

No description provided.

[nholling]

Projecting an enum to an enum works, however if you project an enum from one assembly to an enum in another assembly an exception is thrown:

AutoMapper.AutoMapperMappingExceptionUnable to create a map expression from AutoMapper.UnitTests.Projection.ProjectEnumTest+CustomerType to AutoMapper.UnitTests.AnotherAssembly.CustomerType
Unable to create a map expression from AutoMapper.UnitTests.Projection.ProjectEnumTest+CustomerType to AutoMapper.UnitTests.AnotherAssembly.CustomerType
   at AutoMapper.QueryableExtensions.Extensions.CreateMemberBindings(IMappingEngine mappingEngine, ExpressionRequest request, TypeMap typeMap, Expression instanceParameter, IDictionary`2 typePairCount) in QueryableExtensions.cs: line 170
   at AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine, ExpressionRequest request, Expression instanceParameter, IDictionary`2 typePairCount) in QueryableExtensions.cs: line 90
   at AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine, ExpressionRequest request, IDictionary`2 typePairCount) in QueryableExtensions.cs: line 71
   at AutoMapper.QueryableExtensions.Extensions.<>c__DisplayClass1`2.<CreateMapExpression>b__0(ExpressionRequest tp) in QueryableExtensions.cs: line 32
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at AutoMapper.Internal.DictionaryFactoryOverride.ConcurrentDictionaryImpl`2.GetOrAdd(TKey key, Func`2 valueFactory) in ConcurrentDictionaryFactory.cs: line 35
   at AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine, String[] membersToExpand) in QueryableExtensions.cs: line 30
   at AutoMapper.QueryableExtensions.ProjectionExpression`1.To(String[] membersToExpand) in QueryableExtensions.cs: line 605
   at AutoMapper.QueryableExtensions.ProjectionExpression`1.To() in QueryableExtensions.cs: line 600
   at AutoMapper.UnitTests.Projection.ProjectEnumTest.ProjectingEnumToEnumInAnotherAssembly() in ProjectEnumTest.cs: line 48

[jbogard]

Well that's odd, thanks for the failing test!

[jbogard]

Digging a little deeper, this is a bit harder it turns out. You have to convert enums at the LINQ level. How would you accomplish this without AutoMapper? Can you send me a LINQ Select projection not using AutoMapper?

customers.Select(c => new Customer {
    FirstName = c.FirstName,
    LastName = c.LastName,
    CustomerType = ????
});

[hazzik]

????

Casting from one enum to another would work (by value). But there is a question: does EF support Enums?

So the possible solutions:

1. Cast by value

customers.Select(c => new Customer {
    FirstName = c.FirstName,
    LastName = c.LastName,
    CustomerType = (CustomerType)c.CustomerType
});

1. ToString+Enum.Parse - this definitely will not work with EF (probably will work with NHibernate)

customers.Select(c => new Customer {
    FirstName = c.FirstName,
    LastName = c.LastName,
    CustomerType = (CustomerType) Enum.Parse(typeof (CustomerType), c.CusomerType.ToString())
});

1. Long IIF (Should work both in EF and NHibernate)

customers.Select(c => new Customer {
    FirstName = c.FirstName,
    LastName = c.LastName,
    CustomerType = = c.CustomerType == A1.CustomerType.M1
                ? A2.CustomerType.M1
                : c.CustomerType == CustomerType.M2
                    ? A2.CustomerType.M1
                    : 0
});

[yyjdelete]

Also failed ProjectTo with when models contains Enum -> byte
byte is the underType of the enum, public enum ModelStatus : byte
using ProjectUsing for all models is an workaround, but it's no difference with just using select(x=>new XView{}), is there other way to do this?
Seem I can use ProjectUsing to map just the Enmu

[lbargaoanu]

@yyjdelete Try the MyGet build.

[lbargaoanu]

I don't think this is worth fixing. One can work around it by creating a map for the enums and casting in ProjectUsing (or whatever works).

[yyjdelete]

@lbargaoanu
Yes, you are right. But it's strange when using v5.0.0-ci-1049, the same Exception(maybe) is thrown without ProjectUsing, but an NullReferenceException is thrown when access ex.Message, seems another issue?

System.NullReferenceException: (locale message...)
   at AutoMapper.AutoMapperMappingException.get_Message()

Maybe fixed in new ci, I will check later

[yyjdelete]

AutoMapperMappingException.Message is work well again in v5.0.0-ci-1052

[lbargaoanu]

@yyjdelete Yes, I saw that and fixed it yesterday.

[lock]

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