ToDictionary2

 public void ReloadCache(TransactionArgs transactionArgs = null)
        {
            List<ATMTaskTypePriorityEntry> taskTypePriorityEntries = _taskTypePriorityDatabaseAccess.GetAllPriorities(transactionArgs);
            TaskTypePriorities = ConvertTableEntriesToTaskTypePriorities(taskTypePriorityEntries);
        }

        private List<ATMTaskTypePriorities> ConvertTableEntriesToTaskTypePriorities(List<ATMTaskTypePriorityEntry> taskTypePriorityEntries)
        {
            return taskTypePriorityEntries
                .GroupBy(entry => entry.TaskTypeDbId)
                .Select(entries => new ATMTaskTypePriorities(entries.Key,
                    entries.ToDictionary(entry => entry.EventThreshold, entry => entry.Priority))).ToList();
        }