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？

Question

我有一个自定义计数器类别,我需要添加一个新的计数器,而不删除或重置任何现有的计数器.我怎样才能做到这一点？

我试着用CounterExists(),但即使我创建了计数器,我怎么能它关联到CounterCreationDataCollection项目,其关联到我现有的计数器类别？

Answer 1

我发现这样做的最好方法是,保留现有原始值,然后在删除并重新创建类别后重新应用它们,特别是因为此主题似乎没有太多信息.

/// <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);
    }
}