public float NextValue()
{
try
{
return(_innerCounter.NextValue());
}
catch
{
ChangeCounter(_nullPerformanceCounter);
return(_innerCounter.NextValue());
}
}
private void SetCounterProperties(string instanceName)
{
var canLoadCounters = true;
foreach (var property in CounterProperties)
{
PerformanceCounterAttribute attribute = GetPerformanceCounterAttribute(property);
if (attribute == null)
{
continue;
}
IPerformanceCounter counter = null;
if (canLoadCounters)
{
counter = LoadCounter(CategoryName, attribute.Name, instanceName, isReadOnly: false);
if (counter == null)
{
// We failed to load the counter so skip the rest
canLoadCounters = false;
}
}
counter = counter ?? NoOpCounter;
// Initialize the counter sample
counter.NextValue();
property.SetValue(this, counter, null);
}
}
private HardwareInformation GetGlobalCpuUsageWithPerfCounter()
{
var cpuIdle = all_Cpu_Idle.NextValue();
return(new HardwareInformation()
{
MainValue = Math.Round(100.0 - cpuIdle, 2),
ShortName = "CPU",
UnitSymbol = "%"
});
}
private IPerformanceCounter CreateCounter(string category, string instance, string counterName)
{
IPerformanceCounter counter = null;
try
{
counter = _counterFactory.Create(category, counterName, instance);
// First call to NextValue returns always 0 -> perforn it without taking value.
counter.NextValue();
}
catch (InvalidOperationException ex)
{
string msg = string.Format("Failed to create counter: {0}, {1}, {2}", counter?.CategoryName,
counter?.CounterName,
counter?.InstanceName);
Logger.Error(ex, msg);
throw new InvalidOperationException(msg, ex);
}
return(counter);
}