So the convention appears to be to use camel case for column/field names within MongoDB. For example if we create an entry such as db.cds.Update({artist:”Alice Cooper”}).

In C# the convention is for properties, for example, to be written in Pascal case. So we’d have something like

public class CD
{
   public ObjectId Id { get; set; }
   public string Artist { get; set; }
   public string Title { get; set; }
   public string Category { get; set; }
}

So obviously MongoDB has a field name artist and we need to map it to the property name “Artist”.

To handle this we can use the BsonElement in the MongoDB.Bson.Serialization.Attributes namespace, as per

public class CD
{
   public ObjectId Id { get; set; }
   [BsonElement("artist")]
   public string Artist { get; set; }
   [BsonElement("title")]
   public string Title { get; set; }
   [BsonElement("category")]
   public string Category { get; set; }
}

or we can set up the mappings using the following

BsonClassMap.RegisterClassMap<CD>(cm =>
{
   cm.AutoMap();
   cm.GetMemberMap(c => c.Artist).SetElementName("artist");
   cm.GetMemberMap(c => c.Title).SetElementName("title");
   cm.GetMemberMap(c => c.Category).SetElementName("category");
});

Note: we do not need to setup the Id field to any mapping as this appears to be mapped based upon it’s type.

A class map may only be registered once, we can use BsonClassMap.IsClassMapRegistered if need be to ensure this.

More information can be found at Serialize Documents with the CSharp Driver