MongoDB LinQ “Select” method will really retrieve only a subset of fields?

Question

Searching across the internet how to retrieve a subset of fields in MongoDB, using C# official driver (but using LinQ as the base architecture) I found how to do this in Mon

Answer 1

The driver does not currently retrieve a subset of the fields. If you need that functionality, you'll need to do it manually. The ticket for this functionality is here: https://jira.mongodb.org/browse/CSHARP-456. Feel free to leave feedback or vote it up if you need this.

Answer 2

This is cheating... but:

//This actual implementation is untested and may contain small errors.
//The helper method has been tested and *should* work.

public static IMongoQuery GetMongoQuery<T>(this IQueryable<T> query)
{
    return ((MongoQueryable<T>)query).GetMongoQuery();
}

var temp =
    from x in DB.Foo.AsQueryable<Test>()
    where x.SomeField > 5;
    select (x.OtherField);

return temp.GetMongoQuery().ToJson();