List all performance counters for a category

Question

Is there a built-in method in System.Diagnostics for retrieving all of the instantiated performance counters for a given CategoryName?

We have a number of multi threaded apps using custom performance counters and now need to add a dashboard for displaying the performance statistics.

I'd like to make the dashboard in such a way that it does not need to be updated whenever someone adds a new counter to a new piece of code.

Answer 1

Try this:

public void ListCounters(string categoryName)
{
    PerformanceCounterCategory category = PerformanceCounterCategory.GetCategories().First(c => c.CategoryName == categoryName);
    Console.WriteLine("{0} [{1}]", category.CategoryName, category.CategoryType);

    string[] instanceNames = category.GetInstanceNames();

    if (instanceNames.Length > 0)
    {
        // MultiInstance categories
        foreach (string instanceName in instanceNames)
        {
            ListInstances(category, instanceName);
        }
    }
    else
    {
        // SingleInstance categories
        ListInstances(category, string.Empty);
    }
}

private static void ListInstances(PerformanceCounterCategory category, string instanceName)
{
    Console.WriteLine("    {0}", instanceName);
    PerformanceCounter[] counters = category.GetCounters(instanceName);

    foreach (PerformanceCounter counter in counters)
    {
        Console.WriteLine("        {0}", counter.CounterName);
    }
}

You have to be aware of categories that can have multiple instances and deal with those slightly differently.

Answer 2

Just for fun.. here's the same thing in 1 line of linq:

PerformanceCounterCategory
.GetCategories()
.Where(cat => cat.CategoryName == "ASP.NET v4.0.30319")
.Select (cat => cat.GetInstanceNames().Any() ? cat.GetInstanceNames().Select (i => cat.GetCounters(i)).SelectMany (counter => counter) : cat.GetCounters("")).SelectMany (counter => counter)
.Select(counter => string.Format("{0} : {1}.{2}", counter.InstanceName , counter.CategoryName, counter.CounterName))