InstanceDataCollectionCollection.Contains(String) Method
Definition
Important
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Determines whether an instance data collection for the specified counter (identified by one of the indexed InstanceDataCollection objects) exists in the collection.
public:
bool Contains(System::String ^ counterName);
public bool Contains (string counterName);
member this.Contains : string -> bool
Public Function Contains (counterName As String) As Boolean
Parameters
- counterName
- String
The name of the performance counter.
Returns
true
if an instance data collection containing the specified counter exists in the collection; otherwise, false
.
Exceptions
The counterName
parameter is null
.
Examples
The following code example accepts a PerformanceCounter category name and counter name from the command line. It gets the InstanceDataCollectionCollection for the PerformanceCounterCategory and then uses the Contains method to determine if the specified counter exists. If the counter exists, the example gets the associated InstanceDataCollection and displays the instance names from the collection.
public static void Main(string[] args)
{
// The following values can be used as arguments.
string categoryName = "Process";
string counterName = "Private Bytes";
InstanceDataCollectionCollection idColCol;
// Copy the supplied arguments into the local variables.
try
{
categoryName = args[0];
counterName = args[1];
}
catch
{
// Ignore the exception from non-supplied arguments.
}
try
{
// Get the InstanceDataCollectionCollection for this category.
PerformanceCounterCategory pcc = new PerformanceCounterCategory(categoryName);
idColCol = pcc.ReadCategory();
}
catch(Exception ex)
{
Console.WriteLine("An error occurred getting the InstanceDataCollection for " +
"category \"{0}\"."+ "\n" +ex.Message, categoryName);
return;
}
// Check if this counter name exists using the Contains
// method of the InstanceDataCollectionCollection.
if (!idColCol.Contains(counterName))
{
Console.WriteLine("Counter \"{0}\" does not exist in category \"{1}\".", counterName, categoryName);
return;
}
else
{
// Now get the counter's InstanceDataCollection object using the
// indexer (Item property) for the InstanceDataCollectionCollection.
InstanceDataCollection countData = idColCol[counterName];
ICollection idColKeys = countData.Keys;
string[] idColKeysArray = new string[idColKeys.Count];
idColKeys.CopyTo(idColKeysArray, 0);
Console.WriteLine("Counter \"{0}\" of category \"{1}\" " +
"has {2} instances.", counterName, categoryName, idColKeys.Count);
// Display the instance names for this counter.
int index;
for(index=0; index<idColKeysArray.Length; index++)
{
Console.WriteLine("{0,4} -- {1}", index+1, idColKeysArray[index]);
}
}
}
Sub Main(ByVal args() As String)
Dim categoryName As String = ""
Dim counterName As String = ""
Dim idColCol As InstanceDataCollectionCollection
' Copy the supplied arguments into the local variables.
Try
categoryName = args(0)
counterName = args(1)
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)
idColCol = pcc.ReadCategory()
Catch ex As Exception
Console.WriteLine( _
"An error occurred getting the InstanceDataCollection for " & _
"category ""{0}""." & vbCrLf & ex.Message, categoryName)
Return
End Try
' Check if this counter name exists using the Contains
' method of the InstanceDataCollectionCollection.
If Not idColCol.Contains(counterName) Then
Console.WriteLine( _
"Counter ""{0}"" does not exist in category ""{1}"".", _
counterName, categoryName)
Return
Else
' Now get the counter's InstanceDataCollection object using the
' indexer (Item property) for the InstanceDataCollectionCollection.
Dim countData As InstanceDataCollection = idColCol(counterName)
Dim idColKeys As ICollection = countData.Keys
Dim idColKeysArray(idColKeys.Count - 1) As String
idColKeys.CopyTo(idColKeysArray, 0)
Console.WriteLine("Counter ""{0}"" of category ""{1}"" " & _
"has {2} instances.", counterName, categoryName, idColKeys.Count)
' Display the instance names for this counter.
Dim index As Integer
For index = 0 To idColKeysArray.Length - 1
Console.WriteLine("{0,4} -- {1}", index + 1, idColKeysArray(index))
Next index
End If
End Sub
Remarks
The counterName
parameter is case-insensitive.
Each InstanceDataCollection object in the collection contains the performance data for all counters for an instance. The data is indexed by counter name and then by instance name. Contains returns true
if there is an InstanceDataCollection object whose associated counter has the name specified by the counterName
parameter.
Applies to
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