PerformanceCounterType.NumberOfItems32计算最后一分钟

Question

如何计算最后一分钟的总增量？

        //Create Counter
        CounterCreationDataCollection counter = new CounterCreationDataCollection();

        CounterCreationData total = new CounterCreationData();
        total.CounterName = "totalOps";
        total.CounterType = PerformanceCounterType.NumberOfItems32;
        counter.Add(total);