public static IEnumerable <ObjectId> FilterIntities(this Database db, Func <ObjectId, bool> filterFunction, bool doValidChecks = true)
{
ObjectId result = ObjectId.Null;
foreach (Handle hnd in GenerateHandles(db))
{
if (db.TryGetObjectId(hnd, out result) && (!doValidChecks || result.CheckValid()) && filterFunction(result))
{
yield return(result);
}
}
}
