InstanceDataCollectionCollection Class

Provides a strongly typed collection of InstanceDataCollection objects.

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

public class InstanceDataCollectionCollection : DictionaryBase
public class InstanceDataCollectionCollection extends DictionaryBase
public class InstanceDataCollectionCollection extends DictionaryBase
Not applicable.

The InstanceDataCollectionCollection class represents the collection returned from the ReadCategory method. This collection contains all the counter and instance data. The collection contains an InstanceDataCollection object for each counter. Each InstanceDataCollection object contains the performance data for all counters for that instance. Thus, the data is indexed by counter name and then by instance name.

The following code example displays the instance data for a particular PerformanceCounterCategory on the local computer. It first displays a numbered list of PerformanceCounterCategory names. After the user enters the number of one of the categories, the example gets the InstanceDataCollectionCollection for that PerformanceCounterCategory. It then converts the collection returned by the Values property to an array of InstanceDataCollection objects. The example displays the instance data associated with each InstanceData of each InstanceDataCollection.

using System;
using System.Diagnostics;
using System.Collections;

class InstDataKeysValuesMod

    private static string categoryName;

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

        PerformanceCounterCategory[] categories = PerformanceCounterCategory.GetCategories();

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

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

        // 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 = categories[(categoryNum)].CategoryName;

        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();

        ICollection idColColKeys = idColCol.Keys;
        string[] idCCKeysArray = new string[idColColKeys.Count];
        idColColKeys.CopyTo(idCCKeysArray, 0);

        ICollection idColColValues = idColCol.Values;
        InstanceDataCollection[] idCCValuesArray = new InstanceDataCollection[idColColValues.Count];
        idColColValues.CopyTo(idCCValuesArray, 0);

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

        // Display the InstanceDataCollectionCollection Keys and Values.
        // The Keys and Values collections have the same number of elements.
        int index;
        for(index=0; index<idCCKeysArray.Length; index++)
            Console.WriteLine("  Next InstanceDataCollectionCollection " +
                "Key is \"{0}\"", idCCKeysArray[index]);

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

        ICollection idColKeys = idCol.Keys;
        string[] idColKeysArray = new string[idColKeys.Count];
        idColKeys.CopyTo(idColKeysArray, 0);

        ICollection idColValues = idCol.Values;
        InstanceData[] idColValuesArray = new InstanceData[idColValues.Count];
        idColValues.CopyTo(idColValuesArray, 0);

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

        // Display the InstanceDataCollection Keys and Values.
        // The Keys and Values collections have the same number of elements.
        int index;
        for(index=0; index<idColKeysArray.Length; index++)
            Console.WriteLine("    Next InstanceDataCollection " +
                "Key is \"{0}\"", idColKeysArray[index]);

    // Display the contents of an InstanceData object.
    public static void ProcessInstanceDataObject(InstanceData instData)
        CounterSample sample = instData.Sample;

        Console.WriteLine("    From InstanceData:\r\n      " +
            "InstanceName: {0,-31} RawValue: {1}", instData.InstanceName, instData.Sample.RawValue);
        Console.WriteLine("    From CounterSample:\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