PerformanceCounter.NextValue メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

PerformanceCounter.NextValue メソッド

カウンタサンプルを取得し、計算される値を返します。

名前空間: System.Diagnostics
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Function NextValue As
 Single

Visual Basic (使用法)

Dim instance As PerformanceCounter
Dim returnValue As Single

returnValue = instance.NextValue

public float NextValue ()

C++

public:
float NextValue ()

public float NextValue ()

JScript

public function NextValue () : float

戻り値
このカウンタのためにシステムで取得された計算される値の次の値。

例外

例外の種類	条件
InvalidOperationException	インスタンスがパフォーマンスカウンタに正しく関連付けられていません。
Win32Exception	システム API へのアクセス中にエラーが発生しました。
PlatformNotSupportedException	プラットフォームが Windows 98 または Windows Millennium Edition (Me) です。パフォーマンスカウンタはサポートされません。

解説

メモ
カウンタの計算される値が 2 回のカウンタ読み取りに依存する場合、最初の読み取りでは 0.0 が返されます。

使用例

Visual Basic

Imports System
Imports System.Collections
Imports System.Collections.Specialized
Imports System.Diagnostics
Imports System.Runtime.InteropServices
Imports Microsoft.VisualBasic

Public Class App
   
   Public Shared Sub Main()
      CollectSamples()
   End Sub
   
   Private Shared Sub CollectSamples()

      Dim categoryName as String
 = "ElapsedTimeSampleCategory"
      Dim counterName as String
 = "ElapsedTimeSample"

      If Not PerformanceCounterCategory.Exists(categoryName)
 Then
         
         Dim CCDC As New
 CounterCreationDataCollection()
         
         ' Add the counter.
         Dim ETimeData As New
 CounterCreationData()
         ETimeData.CounterType = PerformanceCounterType.ElapsedTime
         ETimeData.CounterName = counterName
         CCDC.Add(ETimeData)
         
         ' Create the category.
         PerformanceCounterCategory.Create(categoryName, _
            "Demonstrates ElapsedTime performance counter usage.",
 CCDC)
       
      Else
         Console.WriteLine("Category exists - {0}",
 categoryName)
      End If

      ' Create the counter.
      Dim PC As PerformanceCounter
      PC = New PerformanceCounter(categoryName, counterName, False)
     
      ' Initialize the counter.
      PC.RawValue = Stopwatch.GetTimestamp()

      Dim Start As DateTime = DateTime.Now
      
      ' Loop for the samples.
      Dim j As Integer
      For j = 0 To 99
         ' Output the values.
         If j Mod 10 = 9 Then
            Console.WriteLine(("NextValue() = " _
                + PC.NextValue().ToString()))
            Console.WriteLine(("Actual elapsed time = "
 _
                + DateTime.Now.Subtract(Start).ToString()))
            OutputSample(PC.NextSample())
         End If
         
         ' Reset the counter every 20th iteration.
         If j Mod 20 = 0 Then
            PC.RawValue = Stopwatch.GetTimestamp()
            Start = DateTime.Now
         End If
         System.Threading.Thread.Sleep(50)
      Next j
      
      Console.WriteLine(("Elapsed time = " + _
            DateTime.Now.Subtract(Start).ToString()))
   End Sub 
   
   
   Private Shared Sub OutputSample(s
 As CounterSample)
      Console.WriteLine(ControlChars.Lf + ControlChars.Cr + "+++++++")

      Console.WriteLine("Sample values - " + ControlChars.Cr
 _
            + ControlChars.Lf)
      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()))
      
      Console.WriteLine("+++++++")
   End Sub
End Class

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.Runtime.InteropServices;

public class App 
{

    public static void Main()
    {    
        CollectSamples();
    }

   
    public static void CollectSamples()
    {
        const String categoryName = "ElapsedTimeSampleCategory";
        const String counterName = "ElapsedTimeSample";

        if ( !PerformanceCounterCategory.Exists(categoryName)
 ) 
        {

            CounterCreationDataCollection CCDC = new CounterCreationDataCollection();

            // Add the counter.
            CounterCreationData ETimeData = new CounterCreationData();
            ETimeData.CounterType = PerformanceCounterType.ElapsedTime;
            ETimeData.CounterName = counterName;
            CCDC.Add(ETimeData);       
        
            // Create the category.
            PerformanceCounterCategory.Create(categoryName, 
                    "Demonstrates ElapsedTime performance counter usage."
,
                    CCDC);

        }
        else
        {
            Console.WriteLine("Category exists - {0}", categoryName);
        }        

        // Create the performance counter.
        PerformanceCounter PC = new PerformanceCounter(categoryName,
 
                                                       counterName, 
                                                       false);
        // Initialize the counter.
        PC.RawValue = Stopwatch.GetTimestamp();

        DateTime Start = DateTime.Now;

        // Loop for the samples.
        for (int j = 0; j < 100; j++) 
        {
            // Output the values.
            if ((j % 10) == 9) 
            {
                Console.WriteLine("NextValue() = " + PC.NextValue().ToString());
                Console.WriteLine("Actual elapsed time = " + DateTime.Now.Subtract(Start).ToString());
                OutputSample(PC.NextSample());
            }

            // Reset the counter on every 20th iteration.
            if (j % 20 == 0)
            {
                PC.RawValue = Stopwatch.GetTimestamp();
                Start = DateTime.Now;
            }
            System.Threading.Thread.Sleep(50);
        }

        Console.WriteLine("Elapsed time = " + DateTime.Now.Subtract(Start).ToString());
    }

    
    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("++++++++++++++++++++++");
    }
}

C++

#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
using namespace System::Diagnostics;
using namespace System::Runtime::InteropServices;

void OutputSample( CounterSample s )
{
   Console::WriteLine( "\r\n+++++++++++" );
   Console::WriteLine( "Sample values - \r\n" );
   Console::WriteLine( "   BaseValue        = {0}", s.BaseValue );
   Console::WriteLine( "   CounterFrequency = {0}", s.CounterFrequency
 );
   Console::WriteLine( "   CounterTimeStamp = {0}", s.CounterTimeStamp
 );
   Console::WriteLine( "   CounterType      = {0}", s.CounterType );
   Console::WriteLine( "   RawValue         = {0}", s.RawValue );
   Console::WriteLine( "   SystemFrequency  = {0}", s.SystemFrequency );
   Console::WriteLine( "   TimeStamp        = {0}", s.TimeStamp );
   Console::WriteLine( "   TimeStamp100nSec = {0}", s.TimeStamp100nSec
 );
   Console::WriteLine( "++++++++++++++++++++++" );
}

void CollectSamples()
{
   String^ categoryName = "ElapsedTimeSampleCategory";
   String^ counterName = "ElapsedTimeSample";
   
   // Create the performance counter category.
   if (  !PerformanceCounterCategory::Exists( categoryName ) )
   {
      CounterCreationDataCollection^ CCDC = gcnew CounterCreationDataCollection;
      
      // Add the counter.
      CounterCreationData^ ETimeData = gcnew CounterCreationData;
      ETimeData->CounterType = PerformanceCounterType::ElapsedTime;
      ETimeData->CounterName = counterName;
      CCDC->Add( ETimeData );
      
      // Create the category.
      PerformanceCounterCategory::Create( categoryName,
         "Demonstrates ElapsedTime performance counter usage.",
         CCDC );
   }
   else
   {
      Console::WriteLine( "Category exists - {0}", categoryName );
   }

   
   // Create the performance counter.
   PerformanceCounter^ PC = gcnew PerformanceCounter( categoryName,
                                                      counterName,
                                                      false );
   // Initialize the counter.
   PC->RawValue = Stopwatch::GetTimestamp();

   DateTime Start = DateTime::Now;
   
   // Loop for the samples.
   for ( int j = 0; j < 100; j++ )
   {
      // Output the values.
      if ( (j % 10) == 9 )
      {
         Console::WriteLine( "NextValue() = {0}", PC->NextValue() );
         Console::WriteLine( "Actual elapsed time = {0}", DateTime::Now.Subtract(
 Start ) );
         OutputSample( PC->NextSample() );
      }
      
      // Reset the counter on every 20th iteration.
      if ( j % 20 == 0 )
      {
         PC->RawValue = Stopwatch::GetTimestamp();
         Start = DateTime::Now;
      }
      System::Threading::Thread::Sleep( 50 );
   }

   Console::WriteLine( "Elapsed time = {0}", DateTime::Now.Subtract( Start
 ) );
}

int main()
{
   CollectSamples();
}

import System.*;
import System.Collections.*;
import System.Collections.Specialized.*;
import System.Diagnostics.*;
import System.Runtime.InteropServices.*;

public class App
{
    public static void main(String[]
 args)
    {
        CollectSamples();
    } //main

    public static void CollectSamples()
    {
        final String categoryName = "ElapsedTimeSampleCategory";
        final String counterName = "ElapsedTimeSample";

        if (!(PerformanceCounterCategory.Exists(categoryName)))
 {
            CounterCreationDataCollection ccdc = 
                new CounterCreationDataCollection();
            // Add the counter.
            CounterCreationData eTimeData = new CounterCreationData();
            eTimeData.set_CounterType(PerformanceCounterType.ElapsedTime);
            eTimeData.set_CounterName(counterName);
            ccdc.Add(eTimeData);
            // Create the category.
            PerformanceCounterCategory.Create(categoryName, 
                "Demonstrates ElapsedTime performance counter usage.",
 ccdc);
        }
        else {
            Console.WriteLine("Category exists - {0}", categoryName);
        }
        // Create the performance counter.
        PerformanceCounter pc = new PerformanceCounter(categoryName
,
            counterName, false);
        // Initialize the counter.
        pc.set_RawValue(Stopwatch.GetTimestamp());
        DateTime start = DateTime.get_Now();
        // Loop for the samples.
        for (int j = 0; j < 100; j++) {
            // Output the values.
            if (j % 10 == 9) {
                Console.WriteLine("NextValue() = " + ((Single)pc.NextValue()).
                    ToString());
                Console.WriteLine("Actual elapsed time = "
                    + DateTime.get_Now().Subtract(start).ToString());
                OutputSample(pc.NextSample());
            }
            // Reset the counter on every 20th iteration.
            if (j % 20 == 0) {
                pc.set_RawValue(Stopwatch.GetTimestamp());
                start = DateTime.get_Now();
            }
            System.Threading.Thread.Sleep(50);
        }
        Console.WriteLine("Elapsed time = " + DateTime.get_Now().
            Subtract(start).ToString());
    } //CollectSamples

    private static void
 OutputSample(CounterSample s)
    {
        Console.WriteLine("\r\n+++++++++++");
        Console.WriteLine("Sample values - \r\n");
        Console.WriteLine("   BaseValue        = " + s.get_BaseValue());
        Console.WriteLine("   CounterFrequency = " + s.get_CounterFrequency());
        Console.WriteLine("   CounterTimeStamp = " + s.get_CounterTimeStamp());
        Console.WriteLine("   CounterType      = " + s.get_CounterType());
        Console.WriteLine("   RawValue         = " + s.get_RawValue());
        Console.WriteLine("   SystemFrequency  = " + s.get_SystemFrequency());
        Console.WriteLine("   TimeStamp        = " + s.get_TimeStamp());
        Console.WriteLine("   TimeStamp100nSec = " + s.get_TimeStamp100nSec());
        Console.WriteLine("++++++++++++++++++++++");
    } //OutputSample
} //App

.NET Framework のセキュリティ

PerformanceCounterPermission (パフォーマンスカウンタカテゴリを読み取るために必要なアクセス許可)。PerformanceCounterPermissionAccess.Read (関連する列挙体)

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

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PerformanceCounter.NextValue メソッドとは？ わかりやすく解説

PerformanceCounter.NextValue メソッド

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PerformanceCounter.NextValue メソッドとは？わかりやすく解説