We do not yet have support in the aggregation builders for the $set stage.
To be decided is whether there needs to be a LINQ method for $set (i.e. a custom extension method on IMongoQueryable).
- related to
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CSHARP-4745 Unable to cast object of type 'MongoDB.Bson.BsonArray' to type 'MongoDB.Bson.BsonDocument'
- Closed
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CSHARP-3677 How to update document field with another field
- Closed