Hello,
I need to interop from C# with a native method and pass an array of structs.
I have done it as follows:

[StructLayout(LayoutKind.Sequential,Pack=4)]
public struct ISD_STATION_STATE_TYPE
{... //struct fields};

[StructLayout(LayoutKind.Sequential,Pack=4)]
public struct ISD_TRACKER_DATA_TYPE{

[ MarshalAs( UnmanagedType.ByValArray, SizeConst=ISD_MAX_STATIONS)]
public ISD_STATION_STATE_TYPE [] Station;

};

[DllImport("isense.dll")]
public static extern int ISD_GetData (int handle, ref ISD_TRACKER_DATA_TYPE
Data);

but when I call this function:

ISD_TRACKER_DATA_TYPE data= new ISD_TRACKER_DATA_TYPE();
ISD_GetData( handle, ref data );

I obtain a runtime System.TypeLoadException  saying that

Can not marshal field Station of type ... : This type can not be marshaled
as a structure field.
Does anybody know where the problem is and how to solve it?

Many thanks in advance for your help
Javier