MongoDB c# driver override Default value of string from null to string.empty

Question

Using 10gen mondgo db c# driver.I have following class

[BsonId]
public ObjectId Id { get; set; }
public int AttemptId { get; set; }
public int UserId { get; set; }
public int QId { get; set; }
public string UserInput { get; set; }  
public string Feedback{ get; set; }

By default if i dont sent values of UserInput or Feedback (any string ) mongodb put them as null . Is there any way to override this with string.empty while inserting or while fetching the data. Tried setting [BsonDefaultValue("")] but this also didnt work.

Robert Stam · Accepted Answer · 2012-04-10 14:55:31Z

19

[BsonDefaultValue("")] applies only when reading a document from the database that doesn't have a value for the corresponding field. If you want new objects you create in memory to have a value other than null you need to set that value in your constructor. Also, when you save an object to the database if the field is null then that is what is saved and read back.

So just set the default value in your constructor to handle new objects created in memory (and presumably inserted to the database) and use [BsonDefaultValue] to handle reading back documents that might not have a corresponding field.

answered Apr 10, 2012 at 14:55

Robert Stam

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