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InstanceData Class

Holds instance data associated with a performance counter sample.

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

public class InstanceData
public class InstanceData
public class InstanceData
Not applicable.

The following code example displays the contents of the InstanceData objects that exist in a particular PerformanceCounterCategory on the local computer. It first displays a numbered list of PerformanceCounter categories. After the user enters the number of one of the categories, the sample displays, for each PerformanceCounter in the PerformanceCounterCategory, the instance data associated with each instance of the PerformanceCounter.

using System;
using System.Diagnostics;

class InstDataCopyToMod

    private static string categoryName;

    public static void Main()
        string catNumStr;
        int categoryNum;

        PerformanceCounterCategory[] categories = PerformanceCounterCategory.GetCategories();

        // Create and sort an array of category names.
        string[] categoryNames = new string[categories.Length];
        int catX;
        for(catX=0; catX<categories.Length; catX++)
            categoryNames[catX] = categories[catX].CategoryName;

        Console.WriteLine("These categories are registered on this computer:");

        for(catX=0; catX<categories.Length; catX++)
            Console.WriteLine("{0,4} - {1}", catX+1, categoryNames[catX]);

        // Ask the user to choose a category.
        Console.Write("Enter the category number from the above list: ");
        catNumStr = Console.ReadLine();

        // Validate the entered category number.
            categoryNum = int.Parse(catNumStr);
            if (categoryNum<1||categoryNum>categories.Length)
                throw new Exception(String.Format("The category number must be in the " +
                    "range 1..{0}.", categories.Length));
            categoryName = categoryNames[(categoryNum-1)];

        catch(Exception ex)
            Console.WriteLine("\"{0}\" is not a valid category number." +
                "\r\n{1}", catNumStr, ex.Message);

        // Process the InstanceDataCollectionCollection for this category.
        PerformanceCounterCategory pcc = new PerformanceCounterCategory(categoryName);
        InstanceDataCollectionCollection idColCol = pcc.ReadCategory();
        InstanceDataCollection[] idColArray = new InstanceDataCollection[idColCol.Count];

        Console.WriteLine("InstanceDataCollectionCollection for \"{0}\" " +
            "has {1} elements.", categoryName, idColCol.Count);

        // Copy and process the InstanceDataCollection array.
        idColCol.CopyTo(idColArray, 0);

        foreach ( InstanceDataCollection idCol in idColArray )

    // Display the contents of an InstanceDataCollection.
    public static void ProcessInstanceDataCollection(InstanceDataCollection idCol)

        InstanceData[] instDataArray = new InstanceData[idCol.Count];

        Console.WriteLine("  InstanceDataCollection for \"{0}\" " +
            "has {1} elements.", idCol.CounterName, idCol.Count);

        // Copy and process the InstanceData array.
        idCol.CopyTo(instDataArray, 0);

        int idX;
        for(idX=0; idX<instDataArray.Length; idX++)
            ProcessInstanceDataObject(instDataArray[idX].InstanceName, instDataArray[idX].Sample);

    // Display the contents of an InstanceData object.
    public static void ProcessInstanceDataObject(string name, CounterSample CSRef)

        InstanceData instData = new InstanceData(name, CSRef);
        Console.WriteLine("    Data from InstanceData object:\r\n" +
            "      InstanceName: {0,-31} RawValue: {1}", instData.InstanceName, instData.RawValue);

        CounterSample sample = instData.Sample;
        Console.WriteLine("    Data from CounterSample object:\r\n" +
            "      CounterType: {0,-32} SystemFrequency: {1}\r\n" +
            "      BaseValue: {2,-34} RawValue: {3}\r\n" +
            "      CounterFrequency: {4,-27} CounterTimeStamp: {5}\r\n" +
            "      TimeStamp: {6,-34} TimeStamp100nSec: {7}", sample.CounterType, sample.SystemFrequency, sample.BaseValue, sample.RawValue, sample.CounterFrequency, sample.CounterTimeStamp, sample.TimeStamp, sample.TimeStamp100nSec);


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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