Cannot deserialize a 'Guid' from BsonType 'ObjectId' in azure cosmos documentdb

Question

I am using Azure mongo db collection and accessing it via dotnet application. I am getting error for some of the documents "Cannot deserialize a 'Guid' from BsonType 'ObjectId'" while retrieving. In dotnet, model class having Id property of type guid and In document db, _id is stored as binary format. Mongo db version which we are using is MongoDB.Driver-"2.27.0". I am trying to access documents via findasync method and filtering using key property. Can you please help me to get out of this issue?

Answer 1

Hi 95132786 •,

Welcome to Microsoft Q&A forum.

As I understand, you Cannot deserialize a 'Guid' from BsonType 'ObjectId' in azure cosmos documentdb via dotnet application.

Please refer to the below posts with similar error if that helps:

https://stackoverflow.com/questions/65402783/formatexception-cannot-deserialize-a-guid-from-bsontype-objectid

https://www.mongodb.com/community/forums/t/cannot-deserialize-a-list-string-from-bsontype-string/222464

Let us know if this helped, if not, please share configuration details of your database and sample dotnet code so that we can further look.

Thanks