https://oracle.github.io/nosql-dotnet-sdk/api/Oracle.NoSQL.SDK.DoubleValue.AsDouble.html
Property AsDouble | NoSQL SDK for .NET
propertynosqlsdk
https://mongodb.github.io/mongo-csharp-driver/2.4/apidocs/html/P_MongoDB_Bson_BsonValue_AsDouble.htm
BsonValue.AsDouble Property
Casts the BsonValue to a Double (throws an InvalidCastException if the cast is not valid).
bsonvalueproperty