Can not read custom PerformanceCoun ter Instances

[W1ld0ne74]

I am implimenting Performance counters into a web application.

I use the following code to create the counters during setup:
private void SetupPerfCntrs( )
{
System.Diagnost ics.CounterCrea tionDataCollect ion CounterDatas = null;
System.Diagnost ics.CounterCrea tionData cdCounter4 = null;
try
{
if(System.Diagn ostics.Performa nceCounterCateg ory.Exists("Log isOnline"))
{
System.Diagnost ics.Performance CounterCategory .Delete("LogisO nline");
}
// Create a collection of type CounterCreation DataCollection.
CounterDatas = new System.Diagnost ics.CounterCrea tionDataCollect ion();
// Create the counters and set their properties.
cdCounter4 = new System.Diagnost ics.CounterCrea tionData();
cdCounter4.Coun terName = "PaymentsVi ew Response";
cdCounter4.Coun terHelp = "Time in millisecods for Payment View call to
respond";
cdCounter4.Coun terType =
System.Diagnost ics.Performance CounterType.Num berOfItems32;
// Add both counters to the collection.
CounterDatas.Ad d(cdCounter4);
// Create the category and pass the collection to it.
System.Diagnost ics.Performance CounterCategory .Create("LogisO nline", "Logis
Online Web Application Metrics", CounterDatas);
}
catch(Exception ex)
{
throw ex;
}
finally
{
CounterDatas = null;
cdCounter4 = null;
}
}

The code used to write to the performance counters are as follows:
Dim PCPaymentView As System.Diagnost ics.Performance Counter = New
System.Diagnost ics.Performance Counter("LogisO nline", "PaymentsVi ew Response",
"_Total", False)
Dim StartTime As DateTime = DateTime.Now

[W1ld0ne74]

I found the problem. A Counter becomes a single instance counter if you write
to it the first time as a single instance.

Using the following constructor creates a single instance counter:
PerformanceCoun ter pc = new PerformanceCoun ter("Catagory", "Counter", false)

After you have done this, setting InstanceNames and calling RawValue has no
effect.

To create multi instance counters always use the Constructor with Instamce
Names as below:
PerformanceCoun ter pc = new PerformanceCoun ter("Catagory", "Counter",
"_Total", false)

After this, any number of instances can be created as required and
documented everywhere by setting the instance name and setting a rawvalue;

In my case, I was attemting to add instances to counters that have already
been created and where being used by other Performance Counter Instances in
the system.

David B. Taylor

"W1ld0ne74" wrote:

I am implimenting Performance counters into a web application.

I use the following code to create the counters during setup:
private void SetupPerfCntrs( )
{
System.Diagnost ics.CounterCrea tionDataCollect ion CounterDatas = null;
System.Diagnost ics.CounterCrea tionData cdCounter4 = null;
try
{
if(System.Diagn ostics.Performa nceCounterCateg ory.Exists("Log isOnline"))
{
System.Diagnost ics.Performance CounterCategory .Delete("LogisO nline");
}
// Create a collection of type CounterCreation DataCollection.
CounterDatas = new System.Diagnost ics.CounterCrea tionDataCollect ion();
// Create the counters and set their properties.
cdCounter4 = new System.Diagnost ics.CounterCrea tionData();
cdCounter4.Coun terName = "PaymentsVi ew Response";
cdCounter4.Coun terHelp = "Time in millisecods for Payment View call to
respond";
cdCounter4.Coun terType =
System.Diagnost ics.Performance CounterType.Num berOfItems32;
// Add both counters to the collection.
CounterDatas.Ad d(cdCounter4);
// Create the category and pass the collection to it.
System.Diagnost ics.Performance CounterCategory .Create("LogisO nline", "Logis
Online Web Application Metrics", CounterDatas);
}
catch(Exception ex)
{
throw ex;
}
finally
{
CounterDatas = null;
cdCounter4 = null;
}
}

The code used to write to the performance counters are as follows:
Dim PCPaymentView As System.Diagnost ics.Performance Counter = New
System.Diagnost ics.Performance Counter("LogisO nline", "PaymentsVi ew Response",
"_Total", False)
Dim StartTime As DateTime = DateTime.Now
.
.
.
Dim TimeTaken As Int32 = DateTime.Now.Su btract(StartTim e).TotalMillise conds
Dim StoreNumber As String = "Some Store"
PCPaymentView.R awValue = TimeTaken
PCPaymentView.I nstanceName = StoreNumber
PCPaymentView.R awValue = TimeTaken
PCPaymentView.D ispose()

A third application reads the performance counters by using the following
code:
PerformanceCoun ter pc = null;
try
{
pc = new PerformanceCoun ter("LogisOnlin e","PaymentsVie w Response","_Tot al");
Messagebox.show (pc.RawValue)
}

All works well except for the final peice of code which throws an exception
stating the the counter is of single instance type. Actual Exception is as
follows:
Counter is single instance, instance name '_Total' is not valid for this
counter category.

Any help would be VERY MUCH Apreciated

Thanks
David Taylor