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CounterSample.BaseValue, propriété

Obtient une valeur brute de base facultative pour le compteur.

Espace de noms :  System.Diagnostics
Assembly :  System (dans System.dll)

public long BaseValue { get; }

Valeur de propriété

Type : System.Int64
Valeur brute de base, utilisée uniquement si l'échantillon est basé sur plusieurs compteurs.

L'exemple suivant affiche la valeur de la propriété BaseValue pour un compteur.



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


.NET Framework

Pris en charge dans : 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Pris en charge dans : 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (rôle principal du serveur non pris en charge), Windows Server 2008 R2 (rôle principal du serveur pris en charge avec SP1 ou version ultérieure ; Itanium non pris en charge)

Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.

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