Do not insert field if null or empty

Question

I have a C# class with some fields and some of them are null. Those that are null I do not want to be inserted into db with null value. I do not want them inserted into db at all. How do I achieve that?

class User
{
    public string FirstName;
    public string LastName;
    public string MidName;
}

Not every user has a MidName, but Mongo inserts into db with null value on MidName field.

Answer 1

Using the aptly named [BsonIgnoreIfNull] attribute:

class User
{
    public string FirstName;
    public string LastName;
    [BsonIgnoreIfNull]
    public string MidName;
}