CounterCreationDataCollection Class

Definition

Provides a strongly typed collection of CounterCreationData objects.

public class CounterCreationDataCollection : System.Collections.CollectionBase
[System.Serializable]
public class CounterCreationDataCollection : System.Collections.CollectionBase
Inheritance
CounterCreationDataCollection
Attributes

Examples

The following example demonstrates how to use the CounterCreationDataCollection class. The example creates a new instance of the class and uses several methods to add statements to the collection, return their index, and add or remove attributes at a specific index point.

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

Constructors

CounterCreationDataCollection()

Initializes a new instance of the CounterCreationDataCollection class, with no associated CounterCreationData instances.

CounterCreationDataCollection(CounterCreationData[])

Initializes a new instance of the CounterCreationDataCollection class by using the specified array of CounterCreationData instances.

CounterCreationDataCollection(CounterCreationDataCollection)

Initializes a new instance of the CounterCreationDataCollection class by using the specified collection of CounterCreationData instances.

Properties

Capacity

Gets or sets the number of elements that the CollectionBase can contain.

(Inherited from CollectionBase)
Count

Gets the number of elements contained in the CollectionBase instance. This property cannot be overridden.

(Inherited from CollectionBase)
InnerList

Gets an ArrayList containing the list of elements in the CollectionBase instance.

(Inherited from CollectionBase)
Item[Int32]

Indexes the CounterCreationData collection.

List

Gets an IList containing the list of elements in the CollectionBase instance.

(Inherited from CollectionBase)

Methods

Add(CounterCreationData)

Adds an instance of the CounterCreationData class to the collection.

AddRange(CounterCreationData[])

Adds the specified array of CounterCreationData instances to the collection.

AddRange(CounterCreationDataCollection)

Adds the specified collection of CounterCreationData instances to the collection.

Clear()

Removes all objects from the CollectionBase instance. This method cannot be overridden.

(Inherited from CollectionBase)
Contains(CounterCreationData)

Determines whether a CounterCreationData instance exists in the collection.

CopyTo(CounterCreationData[], Int32)

Copies the elements of the CounterCreationData to an array, starting at the specified index of the array.

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetEnumerator()

Returns an enumerator that iterates through the CollectionBase instance.

(Inherited from CollectionBase)
GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
IndexOf(CounterCreationData)

Returns the index of a CounterCreationData object in the collection.

Insert(Int32, CounterCreationData)

Inserts a CounterCreationData object into the collection, at the specified index.

MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
OnClear()

Performs additional custom processes when clearing the contents of the CollectionBase instance.

(Inherited from CollectionBase)
OnClearComplete()

Performs additional custom processes after clearing the contents of the CollectionBase instance.

(Inherited from CollectionBase)
OnInsert(Int32, Object)

This API supports the product infrastructure and is not intended to be used directly from your code.

Performs additional custom processes before a new data entry is inserted into the collection.

OnInsert(Int32, Object)

Performs additional custom processes before inserting a new element into the CollectionBase instance.

(Inherited from CollectionBase)
OnInsertComplete(Int32, Object)

Performs additional custom processes after inserting a new element into the CollectionBase instance.

(Inherited from CollectionBase)
OnRemove(Int32, Object)

Performs additional custom processes when removing an element from the CollectionBase instance.

(Inherited from CollectionBase)
OnRemoveComplete(Int32, Object)

Performs additional custom processes after removing an element from the CollectionBase instance.

(Inherited from CollectionBase)
OnSet(Int32, Object, Object)

Performs additional custom processes before setting a value in the CollectionBase instance.

(Inherited from CollectionBase)
OnSetComplete(Int32, Object, Object)

Performs additional custom processes after setting a value in the CollectionBase instance.

(Inherited from CollectionBase)
OnValidate(Object)

Checks the specified object to determine whether it is a valid CounterCreationData type.

OnValidate(Object)

Performs additional custom processes when validating a value.

(Inherited from CollectionBase)
Remove(CounterCreationData)

Removes a CounterCreationData object from the collection.

RemoveAt(Int32)

Removes the element at the specified index of the CollectionBase instance. This method is not overridable.

(Inherited from CollectionBase)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

ICollection.CopyTo(Array, Int32)

Copies the entire CollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array.

(Inherited from CollectionBase)
ICollection.IsSynchronized

Gets a value indicating whether access to the CollectionBase is synchronized (thread safe).

(Inherited from CollectionBase)
ICollection.SyncRoot

Gets an object that can be used to synchronize access to the CollectionBase.

(Inherited from CollectionBase)
IList.Add(Object)

Adds an object to the end of the CollectionBase.

(Inherited from CollectionBase)
IList.Contains(Object)

Determines whether the CollectionBase contains a specific element.

(Inherited from CollectionBase)
IList.IndexOf(Object)

Searches for the specified Object and returns the zero-based index of the first occurrence within the entire CollectionBase.

(Inherited from CollectionBase)
IList.Insert(Int32, Object)

Inserts an element into the CollectionBase at the specified index.

(Inherited from CollectionBase)
IList.IsFixedSize

Gets a value indicating whether the CollectionBase has a fixed size.

(Inherited from CollectionBase)
IList.IsReadOnly

Gets a value indicating whether the CollectionBase is read-only.

(Inherited from CollectionBase)
IList.Item[Int32]

Gets or sets the element at the specified index.

(Inherited from CollectionBase)
IList.Remove(Object)

Removes the first occurrence of a specific object from the CollectionBase.

(Inherited from CollectionBase)

Extension Methods

Cast<TResult>(IEnumerable)

Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

Enables parallelization of a query.

AsQueryable(IEnumerable)

Converts an IEnumerable to an IQueryable.

Applies to

Prodotto Versioni
.NET 8 (package-provided), 9 (package-provided)
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 (package-provided), 4.7, 4.7.1 (package-provided), 4.7.1, 4.7.2 (package-provided), 4.7.2, 4.8 (package-provided), 4.8, 4.8.1
.NET Standard 2.0 (package-provided)
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9