C# 4 and .NET 4

Performance Monitoring ❘ 487
}
ReadOnly = false,
MachineName = ".",
InstanceLifetime = PerformanceCounterInstanceLifetime.Process,
InstanceName = this.instanceName
};
performanceCounterMouseMoveEventsPerSec = new PerformanceCounter
{
CategoryName = perfomanceCounterCategoryName,
CounterName = perfCountNames["mouseSec"].Item1,
ReadOnly = false,
MachineName = ".",
InstanceLifetime = PerformanceCounterInstanceLifetime.Process,
InstanceName = this.instanceName
};
code snippet PerformanceCounterDemo/MainWindow.xaml.cs
For the calculation of the performance values, you need to add the fields clickCountPerSec and
mouseMoveCountPerSec:
public partial class MainWindow : Window
{
// Performance monitoring counter values
private int clickCountPerSec = 0;
private int mouseMoveCountPerSec = 0;
Add an event handler to the Click event of the button and an event handler to the MouseMove event to the
button, and add the following code to the handlers:
private void OnButtonClick(object sender, RoutedEventArgs e)
{
this.performanceCounterButtonClicks.Increment();
this.clickCountPerSec++;
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
}
this.performanceCounterMouseMoveEvents.Increment();
this.mouseMoveCountPerSec++;
The Increment() method of the PerformanceCounter object increments the counter by one. If you need
to increment the counter by more than one, for example, to add information about a byte count sent or
received, you can use the IncrementBy() method. For the performance counts that show the value in
seconds, just the two variables, clickCountPerSec and mouseMovePerSec, are incremented.
To show updated values every second, add a DispatcherTimer to the members of the MainWindow:
private DispatcherTimer timer;
This timer is configured and started in the constructor. The DispatcherTimer class is a timer from the
namespace System.Windows.Threading. For other than WPF applications, you can use other timers that
are discussed in Chapter 20, “Threads, Tasks, and Synchronization.” The code that is invoked by the timer
is defined with an anonymous method.
public MainWindow()
{
InitializeComponent();
InitializePerfomanceCountNames();
InitializePerformanceCounts();
if (PerformanceCounterCategory.Exists(perfomanceCounterCategoryName))
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