CounterSample Structure

Définition

Espace de noms:

System.Diagnostics

Assembly:

System.Diagnostics.PerformanceCounter.dll

Paquet:

System.Diagnostics.PerformanceCounter v8.0.0

Source:

CounterSample.cs

Définit une structure qui contient les données brutes d'un compteur de performance.

C#

public readonly struct CounterSample : IEquatable<System.Diagnostics.CounterSample>

Héritage

Object

ValueType

CounterSample

Implémente

IEquatable<CounterSample>

Exemples

L’exemple suivant illustre l’utilisation de la classe pour afficher les CounterSample données d’un compteur de performances.

C#

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

public class App
{
    private static PerformanceCounter avgCounter64Sample;
    private static PerformanceCounter avgCounter64SampleBase;

    public static void Main()
    {
        ArrayList samplesList = 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 category.
        if (SetupCategory())
            return;
        CreateCounters();
        CollectSamples(samplesList);
        CalculateResults(samplesList);
    }

    private static bool SetupCategory()
    {
        if ( !PerformanceCounterCategory.Exists("AverageCounter64SampleCategory") )
        {

            CounterCreationDataCollection counterDataCollection = new CounterCreationDataCollection();

            // Add the counter.
            CounterCreationData averageCount64 = new CounterCreationData();
            averageCount64.CounterType = PerformanceCounterType.AverageCount64;
            averageCount64.CounterName = "AverageCounter64Sample";
            counterDataCollection.Add(averageCount64);

            // Add the base counter.
            CounterCreationData averageCount64Base = new CounterCreationData();
            averageCount64Base.CounterType = PerformanceCounterType.AverageBase;
            averageCount64Base.CounterName = "AverageCounter64SampleBase";
            counterDataCollection.Add(averageCount64Base);

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

            return(true);
        }
        else
        {
            Console.WriteLine("Category exists - AverageCounter64SampleCategory");
            return(false);
        }
    }

    private static void CreateCounters()
    {
        // Create the counters.

        avgCounter64Sample = new PerformanceCounter("AverageCounter64SampleCategory",
            "AverageCounter64Sample",
            false);


        avgCounter64SampleBase = new PerformanceCounter("AverageCounter64SampleCategory",
            "AverageCounter64SampleBase",
            false);

        avgCounter64Sample.RawValue=0;
        avgCounter64SampleBase.RawValue=0;
    }
    private static void CollectSamples(ArrayList samplesList)
    {

        Random r = new Random( DateTime.Now.Millisecond );

        // Loop for the samples.
        for (int j = 0; j < 100; j++)
        {

            int value = r.Next(1, 10);
            Console.Write(j + " = " + value);

            avgCounter64Sample.IncrementBy(value);

            avgCounter64SampleBase.Increment();

            if ((j % 10) == 9)
            {
                OutputSample(avgCounter64Sample.NextSample());
                samplesList.Add( avgCounter64Sample.NextSample() );
            }
            else
            {
                Console.WriteLine();
            }

            System.Threading.Thread.Sleep(50);
        }
    }

    private static void CalculateResults(ArrayList samplesList)
    {
        for(int i = 0; i < (samplesList.Count - 1); i++)
        {
            // Output the sample.
            OutputSample( (CounterSample)samplesList[i] );
            OutputSample( (CounterSample)samplesList[i+1] );

            // Use .NET to calculate the counter value.
            Console.WriteLine(".NET computed counter value = " +
                CounterSampleCalculator.ComputeCounterValue((CounterSample)samplesList[i],
                (CounterSample)samplesList[i+1]) );

            // Calculate the counter value manually.
            Console.WriteLine("My computed counter value = " +
                MyComputeCounterValue((CounterSample)samplesList[i],
                (CounterSample)samplesList[i+1]) );
        }
    }

    //++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++//++++++++
    //    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 static Single MyComputeCounterValue(CounterSample s0, CounterSample s1)
    {
        Single numerator = (Single)s1.RawValue - (Single)s0.RawValue;
        Single denomenator = (Single)s1.BaseValue - (Single)s0.BaseValue;
        Single counterValue = numerator / denomenator;
        return(counterValue);
    }

    // Output information about the counter sample.
    private static void OutputSample(CounterSample s)
    {
        Console.WriteLine("\r\n+++++++++++");
        Console.WriteLine("Sample values - \r\n");
        Console.WriteLine("   BaseValue        = " + s.BaseValue);
        Console.WriteLine("   CounterFrequency = " + s.CounterFrequency);
        Console.WriteLine("   CounterTimeStamp = " + s.CounterTimeStamp);
        Console.WriteLine("   CounterType      = " + s.CounterType);
        Console.WriteLine("   RawValue         = " + s.RawValue);
        Console.WriteLine("   SystemFrequency  = " + s.SystemFrequency);
        Console.WriteLine("   TimeStamp        = " + s.TimeStamp);
        Console.WriteLine("   TimeStamp100nSec = " + s.TimeStamp100nSec);
        Console.WriteLine("++++++++++++++++++++++");
    }
}

Constructeurs

CounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType)	Initialise une nouvelle instance de la structure CounterSample et affecte à la propriété CounterTimeStamp la valeur 0 (zéro).
CounterSample(Int64, Int64, Int64, Int64, Int64, Int64, PerformanceCounterType, Int64)	Initialise une nouvelle instance de la structure CounterSample et affecte à la propriété CounterTimeStamp la valeur qui est passée.

Champs

Empty

Définit un échantillon de compteur de performance vide et non initialisé de type NumberOfItems32.

Propriétés

BaseValue	Obtient une valeur brute de base facultative pour le compteur.
CounterFrequency	Obtient la fréquence du compteur brut.
CounterTimeStamp	Obtient l'horodatage du compteur.
CounterType	Obtient le type du compteur de performance.
RawValue	Obtient la valeur brute du compteur.
SystemFrequency	Obtient la fréquence brute du système.
TimeStamp	Obtient l'horodatage brut.
TimeStamp100nSec	Obtient l'horodatage brut haute-fidélité.

Méthodes

Calculate(CounterSample)	Calcule les données de performance du compteur, à l'aide d'un point de l'échantillon. Cette méthode est utilisée en général pour les types de compteur de performance non calculés.
Calculate(CounterSample, CounterSample)	Calcule les données de performance du compteur, à l'aide de deux points de l'échantillon. Cette méthode est généralement utilisée pour les types de compteurs de performance calculés, tels que les moyennes.
Equals(CounterSample)	Indique si la structure CounterSample spécifiée est égale à la structure CounterSample actuelle.
Equals(Object)	Indique si la structure spécifiée est une structure CounterSample et si elle est identique à la structure CounterSample en cours.
GetHashCode()	Obtient un code de hachage pour l'échantillon de compteur actuel.

Opérateurs

Equality(CounterSample, CounterSample)	Retourne une valeur qui indique si deux structures CounterSample sont égales.
Inequality(CounterSample, CounterSample)	Retourne une valeur qui indique si deux structures CounterSample ne sont pas égales.

S’applique à