C# Receiving CustomMissionAction

[Hegyusz]

Hello,

Does anybody know how can I properly receive Custom Mission Actions in C# with simconnect?

The following C# code seems to be working, but I can only get the first letter of the szPayLoad...

simconnect.OnRecvCustomAction += new SimConnect.RecvCustomActionEventHandler(simconnect_OnRecvEvent);
simconnect.SubscribeToSystemEvent(EVENTS.CUSTOM, "CustomMissionActionExecuted");

private void simconnect_OnRecvCustomAction(SimConnect sender, SIMCONNECT_RECV_CUSTOM_ACTION recAction)
{
// recAction.szPayLoad
}

I realised, that the SIMCONNECT_RECV_CUSTOM_ACTION class (from the DLL) looks like this:

public class SIMCONNECT_RECV_CUSTOM_ACTION : SIMCONNECT_RECV_EVENT_BASE
{
public uint dwWaitForCompletion;

public Guid guidInstanceId;
[VariableSize]
public string szPayLoad;

public SIMCONNECT_RECV_CUSTOM_ACTION();
}

... and the variable size attribute (from the DLL):

public class VariableSizeAttribute : Attribute
{
public VariableSizeAttribute();
public string CountMember { get; set; }
public Type FixedType { get; set; }
public string TypeMember { get; set; }
}

Can anybody help me, how can I set this VariableSize attribute, or what's the problem with my code?

Thanks.