Check if a BsonValue is not null

Question

Take for example the following extract from a mongo collection :

{"IsBasedOnProduct" : {
        "CodeUV" : "09184",
        "Name" : null,
        "pricingVersion" : "B"
    }
}

I would like to extract the Name field from this collection and put it in a C# object. But i do not know how to manage the null value.

This is what I am doing in my C# application :

if (foo.Contains("IsBasedOnProduct"))
{
    fooToExcel.Name = foo["IsBasedOnProduct"].AsBsonDocument.Contains("Name") ? foo["IsBasedOnProduct"]["Name"].AsString : string.Empty;
}

Of course when the Name is null, i throw an System.ArgumentNullException How can I fix it in order to put string.Empty when the value is null ?

Answer 1

Fix it using the following snapshot of code :

if (foo.Contains("IsBasedOnProduct") && foo["IsBasedOnProduct"].BsonType != BsonType.Null)
{
    fooToExcel.Name = foo["IsBasedOnProduct"].AsBsonDocument.Contains("Name")&& foo["IsBasedOnProduct"]["Name"].BsonType != BsonType.Null ? 
                        foo["IsBasedOnProduct"]["Name"].AsString : string.Empty;
}