Convert anonymous type to new C# 7 tuple type

Of course, by creating the tuple from your LINQ expression:

public (int id, string name) GetSomeInfo() {
    var obj = Query<SomeType>()
        .Select(o => (o.Id,o.Name))
        .First();

    return obj;
}

According to another answer regarding pre-C# 7 tuples, you can use AsEnumerable() to prevent EF to mix things up. (I have not much experience with EF, but this should do:)

public (int id, string name) GetSomeInfo() {
    var obj = Query<SomeType>()
        .AsEnumerable()
        .Select(o => (o.Id,o.Name))
        .First();

    return obj;
}