PerformanceCounterCategory.CounterExists-Methode (String)

public static void Main(string[] args)
{
    string categoryName = "";
    string counterName = "";
    string machineName = "";
    bool objectExists = false;
    PerformanceCounterCategory pcc;

    // Copy the supplied arguments into the local variables.
    try
    {
        categoryName = args[0];
        counterName = args[1];
        machineName = (args[2]=="."? "": args[2]);
    }
    catch(Exception ex)
    {
        // Ignore the exception from non-supplied arguments.
    }

    try
    {
        if (machineName.Length==0)
        {
            pcc = new PerformanceCounterCategory(categoryName);
        }
        else
        {
            pcc = new PerformanceCounterCategory(categoryName, machineName);
        }

        // Check whether the specified counter exists.
        // Use the per-instance overload of CounterExists.
        objectExists = pcc.CounterExists(counterName);

    }
    catch(Exception ex)
    {
        Console.WriteLine("Unable to check for the existence of " +
            "counter \"{0}\" in category \"{1}\" on "+
            (machineName.Length>0? "computer \"{2}\".": "this computer.")+ "\n" + 
            ex.Message, counterName, categoryName, machineName);
        return;
    }

    // Tell the user whether the counter exists.
    Console.WriteLine("Counter \"{0}\" " + (objectExists? "exists": "does not exist") + 
        " in category \"{1}\" on " + (machineName.Length>0? "computer \"{2}\".": "this computer."), 
        counterName, pcc.CategoryName, pcc.MachineName);
}