If I have a bson document with keys that do not map to properties in a .net object I am deserializing to, a FormatException is thrown. While I am returning more info than necessary over the wire (doing the mongo equivalent of SELECT * ) I think the code should still function.

at MongoDB.Bson.DefaultSerializer.BsonClassMapSerializer.DeserializeDocument(BsonReader bsonReader, Type nominalType) in D:\justin's projects\mongo-csharp\Bson\DefaultSerializer\BsonClassMapSerializer.cs:line 83
at MongoDB.Bson.Serialization.BsonSerializer.DeserializeDocument(BsonReader bsonReader, Type nominalType) in D:\justin's projects\mongo-csharp\Bson\Serialization\BsonSerializer.cs:line 69
at MongoDB.Bson.Serialization.BsonSerializer.DeserializeDocument[T](BsonReader bsonReader) in D:\justin's projects\mongo-csharp\Bson\Serialization\BsonSerializer.cs:line 45
at MongoDB.Driver.Internal.MongoReplyMessage`1.ReadFrom(BsonBuffer buffer) in D:\justin's projects\mongo-csharp\Driver\Internal\MongoReplyMessage.cs:line 88
at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument]() in D:\justin's projects\mongo-csharp\Driver\Internal\MongoConnection.cs:line 291
at MongoDB.Driver.MongoCursor`2.MongoCursorEnumerator.GetReply(MongoRequestMessage message) in D:\justin's projects\mongo-csharp\Driver\Core\MongoCursor.cs:line 477
at MongoDB.Driver.MongoCursor`2.MongoCursorEnumerator.GetFirst() in D:\justin's projects\mongo-csharp\Driver\Core\MongoCursor.cs:line 442
at MongoDB.Driver.MongoCursor`2.MongoCursorEnumerator.MoveNext() in D:\justin's projects\mongo-csharp\Driver\Core\MongoCursor.cs:line 369
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at MongoDB.Driver.MongoCollection.FindOneAs[TQuery,TDocument](TQuery query) in D:\justin's projects\mongo-csharp\Driver\Core\MongoCollection.cs:line 292
at MongoDB.Driver.MongoCollection.FindOneAs[TDocument](IBsonSerializable query) in D:\justin's projects\mongo-csharp\Driver\Core\MongoCollection.cs:line 286
at BEGIN MY COMPANIES CODE