Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

InstanceDataCollection Class

Provides a strongly typed collection of InstanceData objects.

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

public class InstanceDataCollection : DictionaryBase
public class InstanceDataCollection extends DictionaryBase
public class InstanceDataCollection extends 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.

Imports System
Imports System.Diagnostics
Imports System.Collections
Imports Microsoft.VisualBasic

Module InstDataKeysValuesMod

    Private categoryName As String

    Sub Main()
        Dim catNumStr As String
        Dim categoryNum As Integer

        Dim categories As PerformanceCounterCategory() = _
            PerformanceCounterCategory.GetCategories()

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

        Dim catX As Integer
        For catX = 0 To categories.Length - 1
            Console.WriteLine("{0,4} - {1}", catX + 1, _
                categories(catX).CategoryName)
        Next 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.
        Try
            categoryNum = Integer.Parse(catNumStr)
            If categoryNum < 1 Or categoryNum > categories.Length Then
                Throw New Exception( _
                    String.Format("The category number must be in the " & _
                        "range 1..{0}.", categories.Length))
            End If
            categoryName = categories((categoryNum - 1)).CategoryName

        Catch ex As Exception
            Console.WriteLine("""{0}"" is not a valid category number." & _
                vbCrLf & "{1}", catNumStr, ex.Message)
            Return
        End Try

        ' Process the InstanceDataCollectionCollection for this category.
        Dim pcc As New PerformanceCounterCategory(categoryName)
        Dim idColCol As InstanceDataCollectionCollection = pcc.ReadCategory()

        Dim idColColKeys As ICollection = idColCol.Keys
        Dim idCCKeysArray(idColColKeys.Count - 1) As String
        idColColKeys.CopyTo(idCCKeysArray, 0)

        Dim idColColValues As ICollection = idColCol.Values
        Dim idCCValuesArray(idColColValues.Count - 1) As InstanceDataCollection
        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.
        Dim index As Integer
        For index = 0 To idCCKeysArray.Length - 1
            Console.WriteLine("  Next InstanceDataCollectionCollection " & _
                "Key is ""{0}""", idCCKeysArray(index))
            ProcessInstanceDataCollection(idCCValuesArray(index))
        Next index
    End Sub

    ' Display the contents of an InstanceDataCollection.
    Sub ProcessInstanceDataCollection(ByVal idCol As InstanceDataCollection)

        Dim idColKeys As ICollection = idCol.Keys
        Dim idColKeysArray(idColKeys.Count - 1) As String
        idColKeys.CopyTo(idColKeysArray, 0)

        Dim idColValues As ICollection = idCol.Values
        Dim idColValuesArray(idColValues.Count - 1) As InstanceData
        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.
        Dim index As Integer
        For index = 0 To idColKeysArray.Length - 1
            Console.WriteLine("    Next InstanceDataCollection " & _
                "Key is ""{0}""", idColKeysArray(index))
            ProcessInstanceDataObject(idColValuesArray(index))
        Next index
    End Sub

    ' Display the contents of an InstanceData object.
    Sub ProcessInstanceDataObject(ByVal instData As InstanceData)
        Dim sample As CounterSample = instData.Sample

        Console.WriteLine("    From InstanceData:" & vbCrLf & "      " & _
            "InstanceName: {0,-31} RawValue: {1}", _
            instData.InstanceName, instData.Sample.RawValue)
        Console.WriteLine("    From CounterSample:" & vbCrLf & "      " & _
            "CounterType: {0,-32} SystemFrequency: {1}" & vbCrLf & _
            "      BaseValue: {2,-34} RawValue: {3}" & vbCrLf & _
            "      CounterFrequency: {4,-27} CounterTimeStamp: {5}" & vbCrLf & _
            "      TimeStamp: {6,-34} TimeStamp100nSec: {7}", _
            sample.CounterType, sample.SystemFrequency, sample.BaseValue, _
            sample.RawValue, sample.CounterFrequency, sample.CounterTimeStamp, _
            sample.TimeStamp, sample.TimeStamp100nSec)
    End Sub
End Module

System.Object
   System.Collections.DictionaryBase
    System.Diagnostics.InstanceDataCollection

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

Show:
© 2014 Microsoft