C# 4 and .NET 4

486 ❘ ChaPTer 19 instrumentAtiOn
var counters =
new CounterCreationDataCollection(counterCreationData);
var category = PerformanceCounterCategory.Create(
perfomanceCounterCategoryName,
"Sample Counters for Professional C#",
PerformanceCounterCategoryType.MultiInstance,
counters);
}
MessageBox.Show(String.Format(
"category {0} successfully created",
category.CategoryName));
code snippet PerformanceCounterDemo/MainWindow.xaml.cs
adding PerformanceCounter Components
With Windows Forms or Windows Service applications, you can add PerformanceCounter components
from the toolbox or from the Server Explorer with drag and drop to the designer surface.
With WPF applications that’s not possible. However, it’s not a lot of work to define the performance counters
manually, as this is done with the method InitializePerformanceCounts(). Here, the CategoryName for
all performance counts is set from the const string performanceCounterCategoryName; the CounterName
is set from the sorted list. Because the application writes performance counts, the ReadOnly property
must be set to false. When writing an application that just reads performance counts for display
purposes, you can use the default value of the ReadOnly property, which is true. The InstanceName of
the PerformanceCounter object is set to an application name. If the counters are configured to be global
counts, the InstanceName may not be set.
private PerformanceCounter performanceCounterButtonClicks;
private PerformanceCounter performanceCounterButtonClicksPerSec;
private PerformanceCounter performanceCounterMouseMoveEvents;
private PerformanceCounter performanceCounterMouseMoveEventsPerSec;
private void InitializePerformanceCounts()
{
performanceCounterButtonClicks = new PerformanceCounter
{
CategoryName = perfomanceCounterCategoryName,
CounterName = perfCountNames["clickCount"].Item1,
ReadOnly = false,
MachineName = ".",
InstanceLifetime = PerformanceCounterInstanceLifetime.Process,
InstanceName = this.instanceName
};
performanceCounterButtonClicksPerSec = new PerformanceCounter
{
CategoryName = perfomanceCounterCategoryName,
CounterName = perfCountNames["clickSec"].Item1,
ReadOnly = false,
MachineName = ".",
InstanceLifetime = PerformanceCounterInstanceLifetime.Process,
InstanceName = this.instanceName
};
performanceCounterMouseMoveEvents = new PerformanceCounter
{
CategoryName = perfomanceCounterCategoryName,
CounterName = perfCountNames["mouseCount"].Item1,
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