OrderList is logging error

[kenconcannon]

I want to get a collection of orders from the strategy. I added a list called OrderList

public List<Order> OrderList = new List<Order>();

and then added the following to OnOrderUpdate to add the order to the list:

OrderList.Add(order);

It is adding the orders to the list but I am getting the following error in the log:

4/13/2022 9:51:20 PM	DB	Error on executing DB command: System.InvalidOperationException: There was an error reflecting type 'NinjaTrader.NinjaScript.Strategies.kc.BABTrend3'. ---> System.InvalidOperationException: There was an error reflecting field 'OrderList'. ---> System.InvalidOperationException: There was an error reflecting type 'NinjaTrader.Cbi.Order'. ---> System.InvalidOperationException: There was an error reflecting property 'UserData'. ---> System.InvalidOperationException: There was an error reflecting type 'System.Xml.Linq.XDocument'. ---> System.InvalidOperationException: Cannot serialize member 'System.Xml.Linq.XDocument.Declaration' of type 'System.Xml.Linq.XDeclaration', see inner exception for more details. ---> System.InvalidOperationException: System.Xml.Linq.XDeclaration cannot be serialized because it does not have a parameterless constructor. --- End of inner exception stack trace --- at System.Xml.Serialization.StructModel.CheckSupporte dMember(TypeDesc typeDesc, MemberInfo member, Type type) at System.Xml.Serialization.StructModel.GetPropertyMo del(PropertyInfo propertyInfo) at System.Xml.Serialization.StructModel.GetFieldModel (MemberInfo memberInfo) at System.Xml.Serialization.XmlReflectionImporter.Ini tializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortStructLikeMapping(StructModel model, String ns, Boolean openModel, XmlAttributes a, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortAccessorMapping(MemberMapping accessor, FieldModel model, XmlAttributes a, String ns, Type choiceIdentifierType, Boolean rpc, Boolean openModel, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortFieldMapping(StructModel parent, FieldModel model, XmlAttributes a, String ns, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Ini tializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlReflectionImporter.Ini tializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortStructLikeMapping(StructModel model, String ns, Boolean openModel, XmlAttributes a, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Cre ateArrayElementsFromAttributes(ArrayMapping arrayMapping, XmlArrayItemAttributes attributes, Type arrayElementType, String arrayElementNs, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortArrayLikeMapping(ArrayModel model, String ns, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortAccessorMapping(MemberMapping accessor, FieldModel model, XmlAttributes a, String ns, Type choiceIdentifierType, Boolean rpc, Boolean openModel, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortFieldMapping(StructModel parent, FieldModel model, XmlAttributes a, String ns, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Ini tializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlReflectionImporter.Ini tializeStructMembers(StructMapping mapping, StructModel model, Boolean openModel, String typeName, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortStructLikeMapping(StructModel model, String ns, Boolean openModel, XmlAttributes a, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) --- End of inner exception stack trace --- at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortElement(TypeModel model, XmlRootAttribute root, String defaultNamespace, RecursionLimiter limiter) at System.Xml.Serialization.XmlReflectionImporter.Imp ortTypeMapping(Type type, XmlRootAttribute root, String defaultNamespace) at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace) at NinjaTrader.NinjaScript.StrategyBase.ToXml() at NinjaTrader.NinjaScript.StrategyBase.DbAdd() at NinjaTrader.Cbi.DB.DBThread()

I am not sure where to begin. Adding the list and adding the order to the list seems pretty simple.

Thanks in advance for your help.

[NinjaTrader_Jesse]

Hello kenconcannon,

It looks like you made a public variable, the platform is trying to serialize (save) the values of the list but that wont work with Order objects. You can make it private to avoid that.

private List<Order> OrderList = new List<Order>();

You will need to remove the strategy and re apply it for this change as it is a class level variable.