'idlist': give the caller a chance to tell us how to store the values. about nettopologysuite.io.tinywkb HOT 2 CLOSED

GeometryCollection gc = /* ... */;
long[] idList = /* ... */;

EventHandler<EventArgsSubclass> handler = this.TheNewEvent;
if (handler != null)
{
    EventArgsSubclass args = new EventArgsSubclass(gc, idList);
    handler(this, args);
}
else
{
    for (int i = 0; i < gc.NumGeometries; i++)
    {
        gc.GetGeometryN(i).UserData = idList[i];
    }
}

BinaryWriter writer = /* ... */;
GeometryCollection gc = /* ... */;

EventHandler<EventArgsSubclass> handler = this.TheNewEvent;
long[] idList;
if (handler != null)
{
    EventArgsSubclass args = new EventArgsSubclass(gc);
    handler(this, args);
    idList = args.IdList.ToArray();
}
else
{
    idList = new long[gc.Count];
    bool fallback = false;
    for (int i = 0; i < idList.Length; i++)
    {
        object userData = gc.GetGeometryN(i).UserData;
        if (userData is null)
        {
            fallback = true;
            break;
        }

        try
        {
            idList[i] = Convert.ToInt64(userData, CultureInfo.InvariantCulture);
        }
        catch
        {
            fallback = true;
            break;
        }
    }

    if (fallback)
    {
        for (int i = 0; i < idList.Length; i++)
        {
            idList[i] = GetNextId();
        }
    }
}