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InstanceDataCollection Class

Provides a strongly typed collection of InstanceData objects.

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

public class InstanceDataCollection : DictionaryBase

The InstanceDataCollection class represents a collection containing all the instance data for a counter. This collection is contained in the InstanceDataCollectionCollection when using the ReadCategory method.

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 Values to an array of InstanceDataCollection objects. The example also 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 - 1)].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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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