I’ve blogged some days ago on the possibility to save log4net logs inside a Mongo database, but you should be aware that this technique can be dangerous if your objects have circular references.
Acircular reference happens when object A reference object B and object B directly or indirectly reference object A again and this is a high risk when you work with Mongo Serializer.
Mongo Serializer does not likes circular references (it is perfectly acceptable, because documents with circular references cannot be saved into a document database), but the problem is: if you try to serialize an object that has a circular reference you will get a StackOverflowException and your process will crash, as stated in official documentation from MSDN.
Starting with the .NET Framework version 2.0, a StackOverflowException object cannot be caught by a try-catch block and the corresponding process is terminated by default. Consequently, users are advised to write their code to detect and prevent a stack overflow.
If you remember how I modified MongoDb log4net appender, I decided to save into MongoDB complex objects with this code:
if (compositeProperties != null && compositeProperties.Count > 0)
var properties = new BsonDocument();
foreach (DictionaryEntry entry in compositeProperties)
if (!BsonTypeMapper.TryMapToBsonValue(entry.Value, out value))
properties[entry.Key.ToString()] = entry.Value.ToBsonDocument();
properties[entry.Key.ToString()] = value;
toReturn["customproperties"] = properties;
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