如何在不删除旧计数器的情况下将新计数器添加到现有性能计数器类别？答案

【问题标题】：How to add a new counter to an existing performance counter category without deleting the old counters?如何在不删除旧计数器的情况下将新计数器添加到现有性能计数器类别？
【发布时间】：2011-03-18 09:12:22
【问题描述】：

我有一个自定义计数器类别，我需要向其中添加一个新计数器，而无需删除或重置任何现有计数器。我怎样才能做到这一点？

我尝试使用 CounterExists()，但即使在我创建了计数器之后，我如何才能将其关联到 CounterCreationDataCollection 项并将其关联到我现有的计数器类别？

【问题讨论】：

标签： c# .net performancecounter

【解决方案1】：

我发现最好的方法是保留现有的原始值，然后在删除并重新创建类别后重新应用它们，特别是因为似乎没有太多关于此主题的信息。

/// <summary>
/// When deleting the Category, need to preserve the existing counter values
/// </summary>
static Dictionary<string, long> GetPreservedValues(string category, XmlNodeList nodes)
{
    Dictionary<string, long> preservedValues = new Dictionary<string, long>();

    foreach (XmlNode counterNode in nodes)
    {
        string counterName = counterNode.Attributes["name"].Value;

        if (PerformanceCounterCategory.CounterExists(counterName, category))
        {
            PerformanceCounter performanceCounter = new PerformanceCounter(category, counterName, false);
            preservedValues.Add(counterName, performanceCounter.RawValue);

            Console.WriteLine("Preserving {0} with a RawValue of {1}", counterName, performanceCounter.RawValue);
        }
        else
        {
            Console.WriteLine("Unable to preserve {0} because it doesn't exist", counterName);
        }
    }

    return preservedValues;
}

/// <summary>
/// Restore preserved values after the category has been re-created
/// </summary>
static void SetPreservedValues(string category, Dictionary<string, long> preservedValues)
{
    foreach (KeyValuePair<string, long> preservedValue in preservedValues)
    {
        PerformanceCounter performanceCounter = new PerformanceCounter(category, preservedValue.Key, false);
        performanceCounter.RawValue = preservedValue.Value;

        Console.WriteLine("Restoring {0} with a RawValue of {1}", preservedValue.Key, performanceCounter.RawValue);
    }
}

【讨论】：