InstanceDataCollection.Item[String] Proprietà

public:
 property System::Diagnostics::InstanceData ^ default[System::String ^] { System::Diagnostics::InstanceData ^ get(System::String ^ instanceName); };

public System.Diagnostics.InstanceData this[string instanceName] { get; }

member this.Item(string) : System.Diagnostics.InstanceData

Default Public ReadOnly Property Item(instanceName As String) As InstanceData

Parametri

Valore della proprietà

Elemento InstanceData in base al quale viene indicizzato l'oggetto InstanceDataCollection.

Eccezioni

Esempio

Nell'esempio di codice seguente vengono accettati un nome di categoria, un PerformanceCounter nome di contatore e un nome di istanza dalla riga di comando. Ottiene l'oggetto InstanceDataCollectionCollection per la categoria , che è una raccolta di InstanceDataCollection oggetti . Da questo ottiene il particolare InstanceDataCollection per il contatore specificato. Quindi, se l'istanza esiste, nell'esempio viene utilizzata la Item[] proprietà (a cui viene fatto riferimento come indicizzatore) per ottenere l'oggetto associato InstanceData .

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

Commenti

Il instanceName parametro non fa distinzione tra maiuscole e minuscole.

Si applica a