How to add a new counter to an existing performance counter category without deleting the old counters?
I have a custom counter category, to which I need to add a new counter,开发者_Go百科 without deleting or resetting any existing counters. How can I do this?
I tried using CounterExists(), but even after I create the counter, how can I associate it to a CounterCreationDataCollection item and associate it to my existing counter category?
The best way to do this I found, especially since there doesn't seem to be much info on this topic, is to preserve the existing raw values and then re-apply them after the category is deleted and re-created.
/// <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);
}
}
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