private void DoDispose()
{
foreach (var key in _counters.Keys.ToList())
{
if (_counters[key] != null)
{
_counters[key].Dispose();
_counters.Remove(key);
}
}
if (_query != null)
{
_query.Dispose();
_query = null;
}
}
private void DoAddCounters(IEnumerable <IPerfCounter> counters)
{
uint result;
if (_query == null)
{
PdhQueryHandle query;
result = Pdh.PdhOpenQueryW(null, IntPtr.Zero, out query);
if (result != 0)
{
throw new Win32Exception((int)result);
}
_query = query;
}
List <IPerfCounter> missingCounters = new List <IPerfCounter>();
foreach (var counter in counters)
{
PdhCounterHandle hCounter;
result = Pdh.PdhAddEnglishCounterW(_query, counter.Path, IntPtr.Zero, out hCounter);
if (result == Pdh.PDH_CSTATUS_NO_OBJECT ||
result == Pdh.PDH_CSTATUS_NO_COUNTER)
{
missingCounters.Add(counter);
continue;
}
if (result != 0)
{
throw new Win32Exception((int)result);
}
_counters[counter] = hCounter;
}
if (missingCounters.Count > 0)
{
throw new MissingCountersException(missingCounters);
}
}
public static extern UInt32 PdhCollectQueryData(
PdhQueryHandle phQuery);
public static extern UInt32 PdhAddEnglishCounterW(
PdhQueryHandle hQuery,
string szFullCounterPath,
IntPtr dwUserData,
out PdhCounterHandle phCounter);
public static extern UInt32 PdhOpenQueryH(
PdhLogHandle hDataSource,
IntPtr dwUserData,
out PdhQueryHandle phQuery);
public static extern UInt32 PdhOpenQueryW(
string szDataSource,
IntPtr dwUserData,
out PdhQueryHandle phQuery);
