InstanceDataCollection.Contains(String) Methode

Definition

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.PerformanceCounter.dll

Assembly:

System.dll

Bestimmt, ob in der Auflistung eine Leistungsinstanz mit einem angegebenen Namen vorhanden ist, der von einem der indizierten InstanceData-Objekte bezeichnet wird.

public:
 bool Contains(System::String ^ instanceName);

public bool Contains (string instanceName);

member this.Contains : string -> bool

Public Function Contains (instanceName As String) As Boolean

Parameter

instanceName

String

Der Name der Instanz, die in der Auflistung gesucht werden soll.

Gibt zurück

Boolean

true, wenn die Instanz in der Auflistung vorhanden ist, andernfalls false.

Ausnahmen

ArgumentNullException

Der instanceName-Parameter ist null.

Beispiele

Im folgenden Codebeispiel wird ein Kategoriename, ein Zählername und ein PerformanceCounter Instanzname aus der Befehlszeile akzeptiert. Es ruft die InstanceDataCollectionCollection Kategorie ab, die eine Auflistung von InstanceDataCollection Objekten ist. Daraus erhält er den Bestimmten InstanceDataCollection für den angegebenen Zähler. Anschließend wird die Methode verwendet, um zu ermitteln, ob die Contains angegebene Instanz vorhanden ist, indem Sie den Standardnamen einer Instanz verwenden, wenn keine eingegeben wird.

public static void Main(string[] args)
{
    // These values can be used as arguments.
    string categoryName = "Process";
    string counterName = "Private Bytes";
    string instanceName = "Explorer";

    InstanceDataCollection idCol;
    const string SINGLE_INSTANCE_NAME = "systemdiagnosticsperfcounterlibsingleinstance";

    // Copy the supplied arguments into the local variables.
    try
    {
        categoryName = args[0];
        counterName = args[1];
        instanceName = args[2];
    }
    catch
    {
        // Ignore the exception from non-supplied arguments.
    }

    try
    {
        // Get the InstanceDataCollectionCollection for this category.
        PerformanceCounterCategory pcc = new PerformanceCounterCategory(categoryName);
        InstanceDataCollectionCollection idColCol = pcc.ReadCategory();

        // Get the InstanceDataCollection for this counter.
        idCol = idColCol[counterName];
        if (idCol==null)
        {
            throw new Exception("Counter does not exist.");
        }
    }
    catch(Exception ex)
    {
        Console.WriteLine("An error occurred getting the InstanceDataCollection for " +
            "category \"{0}\", counter \"{1}\"." +  "\n" + ex.Message, categoryName, counterName);
        return;
    }

    // If the instance name is empty, use the single-instance name.
    if (instanceName.Length==0)
    {
        instanceName = SINGLE_INSTANCE_NAME;
    }

    // Check if this instance name exists using the Contains
    // method of the InstanceDataCollection.
    if (!idCol.Contains(instanceName))
    {
        Console.WriteLine("Instance \"{0}\" does not exist in counter \"{1}\", " +
            "category \"{2}\".", instanceName, counterName, categoryName);
        return;
    }
    else
    {
        // The instance name exists, now get its InstanceData object
        // using the indexer (Item property) for the InstanceDataCollection.
        InstanceData instData = idCol[instanceName];

        Console.WriteLine("CategoryName: {0}", categoryName);
        Console.WriteLine("CounterName:  {0}", counterName);
        Console.WriteLine("InstanceName: {0}", instData.InstanceName);
        Console.WriteLine("RawValue:     {0}", instData.RawValue);
    }
}

Sub Main(ByVal args() As String)
    ' These values can be used as arguments.
    Dim categoryName As String = "Process"
    Dim counterName As String = "Private Bytes"
    Dim instanceName As String = "Explorer"

    Dim idCol As InstanceDataCollection
    Const SINGLE_INSTANCE_NAME As String = _
        "systemdiagnosticsperfcounterlibsingleinstance"

    ' Copy the supplied arguments into the local variables.
    Try
        categoryName = args(0)
        counterName = args(1)
        instanceName = args(2)
    Catch ex As Exception
        ' Ignore the exception from non-supplied arguments.
    End Try

    Try
        ' Get the InstanceDataCollectionCollection for this category.
        Dim pcc As New PerformanceCounterCategory(categoryName)
        Dim idColCol As InstanceDataCollectionCollection = _
            pcc.ReadCategory()

        ' Get the InstanceDataCollection for this counter.
        idCol = idColCol(counterName)
        If idCol Is Nothing Then
            Throw New Exception("Counter does not exist.")
        End If
    Catch ex As Exception
        Console.WriteLine( _
            "An error occurred getting the InstanceDataCollection for " & _
            "category ""{0}"", counter ""{1}""." & vbCrLf & ex.Message, _
            categoryName, counterName)
        Return
    End Try

    ' If the instance name is empty, use the single-instance name.
    If instanceName.Length = 0 Then
        instanceName = SINGLE_INSTANCE_NAME
    End If

    ' Check if this instance name exists using the Contains
    ' method of the InstanceDataCollection.
    If Not idCol.Contains(instanceName) Then
        Console.WriteLine( _
            "Instance ""{0}"" does not exist in counter ""{1}"", " & _
            "category ""{2}"".", instanceName, counterName, categoryName)
        Return
    Else
        ' The instance name exists, now get its InstanceData object
        ' using the indexer (Item property) for the InstanceDataCollection.
        Dim instData As InstanceData = idCol(instanceName)

        Console.WriteLine("CategoryName: {0}", categoryName)
        Console.WriteLine("CounterName:  {0}", counterName)
        Console.WriteLine("InstanceName: {0}", instData.InstanceName)
        Console.WriteLine("RawValue:     {0}", instData.RawValue)
    End If
End Sub

Hinweise

Der instanceName Parameter ist groß-insensitiv.