PerformanceCounterCategory.GetCounters Method

Retrieves a list of the counters in a performance counter category that contains exactly one instance.

Namespace:  System.Diagnostics
Assembly:  System (in System.dll)

public PerformanceCounter[] GetCounters()

Return Value

Type: System.Diagnostics.PerformanceCounter[]
An array of PerformanceCounter objects indicating the counters that are associated with this single-instance performance counter category.

ExceptionCondition
ArgumentException

The category is not a single instance.

Win32Exception

A call to an underlying system API failed.

InvalidOperationException

The category does not have an associated instance.

UnauthorizedAccessException

Code that is executing without administrative privileges attempted to read a performance counter.

For more information about performance object instances, see the PerformanceCounter class overview.

NoteNote

To read performance counters in Windows Vista and later, Windows XP Professional x64 Edition, or Windows Server 2003, you must either be a member of the Performance Monitor Users group or have administrative privileges.

To avoid having to elevate your privileges to access performance counters in Windows Vista and later, add yourself to the Performance Monitor Users group.

In Windows Vista and later, User Account Control (UAC) determines the privileges of a user. If you are a member of the Built-in Administrators group, you are assigned two run-time access tokens: a standard user access token and an administrator access token. By default, you are in the standard user role. To execute the code that accesses performance counters, you must first elevate your privileges from standard user to administrator. You can do this when you start an application by right-clicking the application icon and indicating that you want to run as an administrator.

The following code example gets a list of the PerformanceCounter objects in a PerformanceCounterCategory. It first creates a PerformanceCounterCategory with the appropriate constructor, based on whether a computer name was specified. It then uses the GetCounters method to return an array of PerformanceCounter objects, selecting the GetCounters overload based on whether an instance name was specified.

This GetCounters() overload fails unless it is used with a single-instance category.


public static void Main(string[] args)
{
    string categoryName = "";
    string machineName = "";
    string instanceName = "";
    PerformanceCounterCategory pcc;
    PerformanceCounter[] counters;

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

    try
    {
        // Create the appropriate PerformanceCounterCategory object.
        if (machineName.Length>0)
        {
            pcc = new PerformanceCounterCategory(categoryName, machineName);
        }
        else
        {
            pcc = new PerformanceCounterCategory(categoryName);
        }

        // Get the counters for this instance or a single instance 
        // of the selected category.
        if (instanceName.Length>0)
        {
            counters = pcc.GetCounters(instanceName);
        }
        else
        {
            counters = pcc.GetCounters();
        }

    }
    catch(Exception ex)
    {
        Console.WriteLine("Unable to get counter information for " + 
            (instanceName.Length>0? "instance \"{2}\" in ": "single-instance ") + 
            "category \"{0}\" on " + (machineName.Length>0? "computer \"{1}\":": "this computer:"), 
            categoryName, machineName, instanceName);
        Console.WriteLine(ex.Message);
        return;
    }

    // Display the counter names if GetCounters was successful.
    if (counters!=null)
    {
        Console.WriteLine("These counters exist in " + 
            (instanceName.Length>0? "instance \"{1}\" of": "single instance") + 
            " category {0} on " + (machineName.Length>0? "computer \"{2}\":": "this computer:"), 
            categoryName, instanceName, machineName);

        // Display a numbered list of the counter names.
        int objX;
        for(objX=0; objX<counters.Length; objX++)
        {
            Console.WriteLine("{0,4} - {1}", objX+1, counters[objX].CounterName);
        }
    }
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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