CounterSample Structure


Defines a structure that holds the raw data for a performance counter.

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

Public Structure CounterSample

System_CAPS_pubmethodCounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType)

Initializes a new instance of the CounterSample structure and sets the CounterTimeStamp property to 0 (zero).

System_CAPS_pubmethodCounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType, Int64)

Initializes a new instance of the CounterSample structure and sets the CounterTimeStamp property to the value that is passed in.


Gets an optional, base raw value for the counter.


Gets the raw counter frequency.


Gets the counter's time stamp.


Gets the performance counter type.


Gets the raw value of the counter.


Gets the raw system frequency.


Gets the raw time stamp.


Gets the raw, high-fidelity time stamp.


Calculates the performance data of the counter, using a single sample point. This method is generally used for uncalculated performance counter types.

System_CAPS_pubmethodSystem_CAPS_staticCalculate(CounterSample, CounterSample)

Calculates the performance data of the counter, using two sample points. This method is generally used for calculated performance counter types, such as averages.


Indicates whether the specified CounterSample structure is equal to the current CounterSample structure.


Indicates whether the specified structure is a CounterSample structure and is identical to the current CounterSample structure.(Overrides ValueType.Equals(Object).)


Gets a hash code for the current counter sample.(Overrides ValueType.GetHashCode().)


Gets the Type of the current instance.(Inherited from Object.)


Returns the fully qualified type name of this instance.(Inherited from ValueType.)


Defines an empty, uninitialized performance counter sample of type NumberOfItems32.

System_CAPS_puboperatorSystem_CAPS_staticEquality(CounterSample, CounterSample)

Returns a value that indicates whether two CounterSample structures are equal.

System_CAPS_puboperatorSystem_CAPS_staticInequality(CounterSample, CounterSample)

Returns a value that indicates whether two CounterSample structures are not equal.

The following example demonstrates the use of the CounterSample class to display data for a performance counter.

Imports System
Imports System.Collections
Imports System.Collections.Specialized
Imports System.Diagnostics


Public Class App

    Private Shared avgCounter64Sample As PerformanceCounter
    Private Shared avgCounter64SampleBase As PerformanceCounter

    Public Shared Sub Main()

        Dim samplesList As New ArrayList()
        'If the category does not exist, create the category and exit.
        'Performance counters should not be created and immediately used.
        'There is a latency time to enable the counters, they should be created
        'prior to executing the application that uses the counters.
        'Execute this sample a second time to use the counters.
        If Not (SetupCategory()) Then
        End If

    End Sub 'Main

    Private Shared Function SetupCategory() As Boolean
        If Not PerformanceCounterCategory.Exists("AverageCounter64SampleCategory") Then

            Dim counterDataCollection As New CounterCreationDataCollection()

            ' Add the counter.
            Dim averageCount64 As New CounterCreationData()
            averageCount64.CounterType = PerformanceCounterType.AverageCount64
            averageCount64.CounterName = "AverageCounter64Sample"

            ' Add the base counter.
            Dim averageCount64Base As New CounterCreationData()
            averageCount64Base.CounterType = PerformanceCounterType.AverageBase
            averageCount64Base.CounterName = "AverageCounter64SampleBase"

            ' Create the category.
            PerformanceCounterCategory.Create("AverageCounter64SampleCategory", _
               "Demonstrates usage of the AverageCounter64 performance counter type.", _
                      PerformanceCounterCategoryType.SingleInstance, counterDataCollection)

            Return True
            Console.WriteLine("Category exists - AverageCounter64SampleCategory")
            Return False
        End If
    End Function 'SetupCategory

    Private Shared Sub CreateCounters()
        ' Create the counters.

        avgCounter64Sample = New PerformanceCounter("AverageCounter64SampleCategory", "AverageCounter64Sample", False)

        avgCounter64SampleBase = New PerformanceCounter("AverageCounter64SampleCategory", "AverageCounter64SampleBase", False)

        avgCounter64Sample.RawValue = 0
        avgCounter64SampleBase.RawValue = 0
    End Sub 'CreateCounters

    Private Shared Sub CollectSamples(ByVal samplesList As ArrayList)

        Dim r As New Random(DateTime.Now.Millisecond)

        ' Loop for the samples.
        Dim j As Integer
        For j = 0 To 99

            Dim value As Integer = r.Next(1, 10)
            Console.Write(j.ToString() + " = " + value.ToString())



            If j Mod 10 = 9 Then
            End If
        Next j
    End Sub 'CollectSamples

    Private Shared Sub CalculateResults(ByVal samplesList As ArrayList)
        Dim i As Integer
        For i = 0 To (samplesList.Count - 1) - 1
            ' Output the sample.
            OutputSample(CType(samplesList(i), CounterSample))
            OutputSample(CType(samplesList((i + 1)), CounterSample))

            ' Use .NET to calculate the counter value.
            Console.WriteLine(".NET computed counter value = " + CounterSampleCalculator.ComputeCounterValue(CType(samplesList(i), CounterSample), CType(samplesList((i + 1)), CounterSample)).ToString())

            ' Calculate the counter value manually.
            Console.WriteLine("My computed counter value = " + MyComputeCounterValue(CType(samplesList(i), CounterSample), CType(samplesList((i + 1)), CounterSample)).ToString())
        Next i
    End Sub 'CalculateResults

    '	Description - This counter type shows how many items are processed, on average,
    '		during an operation. Counters of this type display a ratio of the items 
    '		processed (such as bytes sent) to the number of operations completed. The  
    '		ratio is calculated by comparing the number of items processed during the 
    '		last interval to the number of operations completed during the last interval. 
    ' Generic type - Average
    '  	Formula - (N1 - N0) / (D1 - D0), where the numerator (N) represents the number 
    '		of items processed during the last sample interval and the denominator (D) 
    '		represents the number of operations completed during the last two sample 
    '		intervals. 
    '	Average (Nx - N0) / (Dx - D0)  
    '	Example PhysicalDisk\ Avg. Disk Bytes/Transfer 
    Private Shared Function MyComputeCounterValue(ByVal s0 As CounterSample, ByVal s1 As CounterSample) As [Single]
        Dim numerator As [Single] = CType(s1.RawValue, [Single]) - CType(s0.RawValue, [Single])
        Dim denomenator As [Single] = CType(s1.BaseValue, [Single]) - CType(s0.BaseValue, [Single])
        Dim counterValue As [Single] = numerator / denomenator
        Return counterValue
    End Function 'MyComputeCounterValue

    ' Output information about the counter sample.
    Private Shared Sub OutputSample(ByVal s As CounterSample)
        Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "+++++++++++")
        Console.WriteLine("Sample values - " + ControlChars.Lf + ControlChars.Cr)
        Console.WriteLine(("   BaseValue        = " + s.BaseValue.ToString()))
        Console.WriteLine(("   CounterFrequency = " + s.CounterFrequency.ToString()))
        Console.WriteLine(("   CounterTimeStamp = " + s.CounterTimeStamp.ToString()))
        Console.WriteLine(("   CounterType      = " + s.CounterType.ToString()))
        Console.WriteLine(("   RawValue         = " + s.RawValue.ToString()))
        Console.WriteLine(("   SystemFrequency  = " + s.SystemFrequency.ToString()))
        Console.WriteLine(("   TimeStamp        = " + s.TimeStamp.ToString()))
        Console.WriteLine(("   TimeStamp100nSec = " + s.TimeStamp100nSec.ToString()))
    End Sub 'OutputSample
End Class 'App

.NET Framework
Available since 1.1

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

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