[Bug] Incorrect Nullable<> parsing

[MakarovSoftware]

Here is a problem, that I've got starting from my previous question. I have two types with two properties - "Guid" and "Guid?". And trying to Join em.

In a Join method you call DynamicQueryableExtensions.CheckOuterAndInnerTypes() method, that must check and convert not-a-nullable part to Nullable if needed.

But in fact after parsing Lambda, Method outterLambda.Body.Type returns Anonymous type. That is always not-a-nullable one.

Type example: {Name = "<>f__AnonymousType2761" FullName = "<>f__AnonymousType2761[[System.Nullable`1[[System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"}

And so your library see that there is two different and not-nullable object. I'll try to make a demo project for you.
Nullable-Demo.zip

[StefH]

When using a normal LINQ query, you need to cast to nullable Guid, else it won't compile.
Like:

var query = peopleQuery.Join(petsQuery, people => new { firstKey = (Guid?) people.Id }, pet => new { firstKey = pet.OwnerId }, (inner, outer) => new { pet = inner, person = outer })
                .Select(res => new { personName = res.person.Name, petName = res.pet.Name });

In dynamic LINQ, you need to do the same:

var dynamicQuery2 = dynamicPeopleQuery2.Join(dynamicPetsQuery2, "new (Guid?(Id) as firstKey)", "new (OwnerId as firstKey)", "new (inner as pet, outer as person)")
                .Select("new (person.Name as personName, pet.Name as petName)");

There is no automatic code which can try to make two dynamic objects the same, you have to define what you want.