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Type:
Bug
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Resolution: Gone away
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Priority:
Major - P3
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None
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Affects Version/s: 2.10.4
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Component/s: Linq, Serialization
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None
var find = collection.Find(x => x.ArrayField.Any(predicate)); var a = find.Project<TypeOfX>( Builders<TypeOfX>.Projection .Include(x => x.ArrayField[-1]) .Exclude(x => x.Id) ) .FirstOrDefault() // <-- OK ?.ArrayField[0]; var b = find.Project(x => x.ArrayField[-1]) .FirstOrDefault(); // <-- MongoInternalException: Unexpected field
Both a and b should be the same, but b throws an exception.
If FirstOrDefault() is replaced with ToString(), both queries are exactly the same. There is a bug in the projection object deserializer.