InstanceDataCollection.Keys Property

Definition

Namespace:

System.Diagnostics

Assembly:

System.Diagnostics.PerformanceCounter.dll

Package:

System.Diagnostics.PerformanceCounter v9.0.0-rc.2.24473.5

Source:

InstanceDataCollection.cs

Gets the object and counter registry keys for the objects associated with this instance data.

public:
 property System::Collections::ICollection ^ Keys { System::Collections::ICollection ^ get(); };

public System.Collections.ICollection Keys { get; }

member this.Keys : System.Collections.ICollection

Public ReadOnly Property Keys As ICollection

Property Value

ICollection

An ICollection that represents a set of object-specific registry keys.

Examples

The following code example uses the Keys property of an InstanceDataCollection to return a collection of instance names, which it converts to an array of String. It generates an array of InstanceData objects using the Values property. For each element in the array of instance names, it displays the name and calls a function to process the associated InstanceData object.

// Display the contents of an InstanceDataCollection.
public static void ProcessInstanceDataCollection(InstanceDataCollection idCol)
{

    ICollection idColKeys = idCol.Keys;
    string[] idColKeysArray = new string[idColKeys.Count];
    idColKeys.CopyTo(idColKeysArray, 0);

    ICollection idColValues = idCol.Values;
    InstanceData[] idColValuesArray = new InstanceData[idColValues.Count];
    idColValues.CopyTo(idColValuesArray, 0);

    Console.WriteLine("  InstanceDataCollection for \"{0}\" " +
        "has {1} elements.", idCol.CounterName, idCol.Count);

    // Display the InstanceDataCollection Keys and Values.
    // The Keys and Values collections have the same number of elements.
    int index;
    for(index=0; index<idColKeysArray.Length; index++)
    {
        Console.WriteLine("    Next InstanceDataCollection " +
            "Key is \"{0}\"", idColKeysArray[index]);
        ProcessInstanceDataObject(idColValuesArray[index]);
    }
}

' Display the contents of an InstanceDataCollection.
Sub ProcessInstanceDataCollection(ByVal idCol As InstanceDataCollection)

    Dim idColKeys As ICollection = idCol.Keys
    Dim idColKeysArray(idColKeys.Count - 1) As String
    idColKeys.CopyTo(idColKeysArray, 0)

    Dim idColValues As ICollection = idCol.Values
    Dim idColValuesArray(idColValues.Count - 1) As InstanceData
    idColValues.CopyTo(idColValuesArray, 0)

    Console.WriteLine("  InstanceDataCollection for ""{0}"" " & _
        "has {1} elements.", idCol.CounterName, idCol.Count)

    ' Display the InstanceDataCollection Keys and Values.
    ' The Keys and Values collections have the same number of elements.
    Dim index As Integer
    For index = 0 To idColKeysArray.Length - 1
        Console.WriteLine("    Next InstanceDataCollection " & _
            "Key is ""{0}""", idColKeysArray(index))
        ProcessInstanceDataObject(idColValuesArray(index))
    Next index
End Sub

Remarks

Each software component creates keys for its objects and counters when it is installed and writes counter data while it is executing. You can access this data as you would access any other registry data. However, although you use the registry to collect performance data, the data is not stored in the registry database. Instead, the system collects the data from the appropriate system object managers.