要想創建自定義的計數器，先得實現IPerfCounterProvider接口，CreateCounters方法聲明要創建的計數器，CountersCreated方法把創建的計數器賦值給本類的成員，PerformanceObjectName返回要創建自定義計數器的分類名。
PerfCounterFactory主要用來創建一個IPerfCounterProvider的實例，它有個GetCounters的泛型方法用來創建一個IPerfCounterProvider的實例，CreateCounters方法用來實際的創建性能計數器，另兩個AddPerfCounter方法和Find方法是讓IPerfCounterProvider的兩個方法用的，下面的例子里會有。
PerfCounter是一個實體類，保存每個計數器的名稱，幫助，類型。
好，我們要監控一個web服務的性能，這個Web服務提供相乘和相加的服務，我們要知道這個Web服務的總請求數，每秒調用次數，并發調用數，每個web方法每秒的調用次數，創建計數器如下，關于計數器的類型，及性能計數器的相關內容，請查看MSDN，計數器類型有總量計數器，平均計數器，速率計數器，并發計數器等，分別適用于不同的需求。
復制 
保存public class MathServicePerfCounter : IPerfCounterProvider
{
static MathServicePerfCounter _instance =
PerfCounterFactory.GetCounters<MathServicePerfCounter>();
public static MathServicePerfCounter Instance
{
get { return _instance; }
}
public PerformanceCounter TotalOfRequest;
public PerformanceCounter RateOfRequest;
public PerformanceCounter RateOfAddition;
public PerformanceCounter RateOfMultiplication;
public PerformanceCounter CountOfCurrentRequest;
const string TotalOfRequestStr = "Total # req";
const string RateOfRequestStr = "req/sec";
const string RateOfAdditionStr = "Addition/sec";
const string RateOfMultiplicationStr = "Multiplication/sec";
const string CountOfCurrentRequestStr = "current # req";
#region IPerfCounterProvider 成員
public void CreateCounters()
{
PerfCounterFactory.AddPerfCounter(new PerfCounter(TotalOfRequestStr, "請求總數",
PerformanceCounterType.NumberOfItems64));
PerfCounterFactory.AddPerfCounter(new PerfCounter(RateOfRequestStr, "每秒請求的數量",
PerformanceCounterType.RateOfCountsPerSecond64));
PerfCounterFactory.AddPerfCounter(new PerfCounter(RateOfAdditionStr, "每秒相加請求的數量",
PerformanceCounterType.RateOfCountsPerSecond64));
PerfCounterFactory.AddPerfCounter(new PerfCounter(RateOfMultiplicationStr, "每秒相成的數量",
PerformanceCounterType.RateOfCountsPerSecond64));
PerfCounterFactory.AddPerfCounter(new PerfCounter(CountOfCurrentRequestStr, "當前并發請求量",
PerformanceCounterType.RateOfCountsPerSecond64));
}
public void CountersCreated()
{
TotalOfRequest = PerfCounterFactory.Find(TotalOfRequestStr);
RateOfRequest = PerfCounterFactory.Find(RateOfRequestStr);
RateOfAddition = PerfCounterFactory.Find(RateOfAdditionStr);
RateOfMultiplication = PerfCounterFactory.Find(RateOfMultiplicationStr);
CountOfCurrentRequest = PerfCounterFactory.Find(CountOfCurrentRequestStr);
}
public string PerformanceObjectName()
{
return "MathServicePerfCounter";
}
#endregion
}
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