C#: PerformanceCounter的使用

在实际编程中，有的时候需要密切注意CPU, Memory的变化。这个时候需要用到PerformanceCounter这个类，注意需要using System.Diagnostics;

这里只是在console上进行了一些测试，每一个CategoryName都有很多个CounterName。不需要对所有的CounterName都了解

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Diagnostics;
 using System.Threading;

 namespace ConsoleTest
 {
     class Program
     {
         public static void GetCategoryNameList()
         {
             PerformanceCounterCategory[] myCat2 = PerformanceCounterCategory.GetCategories();
             ; i < myCat2.Length; i++)
             {
                 Console.WriteLine(myCat2[i].CategoryName);
             }
         }
         public static void GetInstanceNameListANDCounterNameList(string CategoryName)
         {
             string[] instanceNames;
             List<PerformanceCounter> counters = new List<PerformanceCounter>();
             PerformanceCounterCategory mycat = new PerformanceCounterCategory(CategoryName);
             try
             {
                 instanceNames = mycat.GetInstanceNames();
                 )
                 {
                     counters.AddRange(mycat.GetCounters());
                 }
                 else
                 {
                     ; i < instanceNames.Length; i++)
                     {
                         counters.AddRange(mycat.GetCounters(instanceNames[i]));
                     }
                 }
                 ; i < instanceNames.Length; i++)
                 {
                     Console.WriteLine(instanceNames[i]);
                 }
                 Console.WriteLine("******************************");
                 foreach (PerformanceCounter counter in counters)
                 {
                     Console.WriteLine(counter.CounterName);
                 }
             }
             catch (Exception)
             {
                 Console.WriteLine("Unable to list the counters for this category");
             }
         }
         private static void PerformanceCounterFun(string CategoryName, string CounterName, string InstanceName)
         {
             PerformanceCounter pc = new PerformanceCounter(CategoryName, CounterName, InstanceName);
             while (true)
             {
                 Thread.Sleep(); // wait for 1 second
                 float Load = pc.NextValue();
                 Console.WriteLine(CounterName + ": " + Load);
             }
         }
         static void Main(string[] args)
         {
             //GetCategoryNameList();
             GetInstanceNameListANDCounterNameList("Memory");
             //PerformanceCounterFun("Processor", "% Processor Time", "_Total");
             //PerformanceCounterFun("Processor", "Working Set", "_Total");
             //PerformanceCounterFun("Memory", "% Committed Bytes In Use", "");
             PerformanceCounterFun("Memory", "Available MBytes", "");
         }
     }
 }