首先是获取特定进程对象，可以使用Process.GetProcesses()方法来获取系统中运行的所有进程，或者使用Process.GetCurrentProcess()方法来获取当前程序所对应的进程对象。当有了进程对象后，可以通过进程对象名称来创建PerformanceCounter类型对象，通过设定PerformanceCounter构造函数的参数实现获取特定进程的CPU和内存使用情况。
具体实例代码如下：
首先是获取本机中所有进程对象，分别输出某一时刻各个进程的内存使用情况：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;
namespace CSharpPerformance
{//该程序可以实时监控所有进程或者指定进程的工作集、私有工作集
class Program
{
static void Main(string[] args)
{
//新建一个Stopwatch变量用来统计程序运行时间
Stopwatch watch = Stopwatch.StartNew();
//获取本机运行的所有进程ID和进程名,并输出哥进程所使用的工作集和私有工作集
foreach (Process ps in Process.GetProcesses())
{
PerformanceCounter pf1 = new PerformanceCounter("Process", "Working Set - Private", ps.ProcessName);
PerformanceCounter pf2 = new PerformanceCounter("Process", "Working Set", ps.ProcessName);
Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集(进程类)", ps.WorkingSet64 / 1024);
Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集 ", pf2.NextValue() / 1024);
//私有工作集
Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "私有工作集 ", pf1.NextValue() / 1024);
}
watch.Stop();
Console.WriteLine(watch.Elapsed);
Console.ReadLine();
}
}
}
其中，工作集ps.WorkingSet64是静态的，pf2.NextValue()是动态变化的，工作集包含进程运行时其独占的内存和与其他进程共享的内存的和，而私有工作集是只包含进程独占的内存。
下面一组代码可以动态显示本程序所对应的进程的CPU和内存使用率的变化：
首先是SystemInfo.cs类：
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.IO;
using System.Text;
using System.Management;
using System.Runtime.InteropServices;
namespace CSharpPerformance
{
public class SystemInfo
{
private int m_ProcessorCount = 0; //CPU个数
private PerformanceCounter pcCpuLoad; //CPU计数器
private long m_PhysicalMemory = 0; //物理内存
private const int GW_HWNDFIRST = 0;
private const int GW_HWNDNEXT = 2;
private const int GWL_STYLE = (-16);
private const int WS_VISIBLE = 268435456;
private const int WS_BORDER = 8388608;
#region AIP声明
[DllImport("IpHlpApi.dll")]
extern static public uint GetIfTable(byte[] pIfTable, ref uint pdwSize, bool bOrder);
[DllImport("User32")]
private extern static int GetWindow(int hWnd, int wCmd);
[DllImport("User32")]
private extern static int GetWindowLongA(int hWnd, int wIndx);
[DllImport("user32.dll")]
private static extern bool GetWindowText(int hWnd, StringBuilder title, int maxBufSize);
[DllImport("user32", CharSet = CharSet.Auto)]
private extern static int GetWindowTextLength(IntPtr hWnd);
#endregion
#region 构造函数
/// <summary>
/// 构造函数，初始化计数器等
/// </summary>
public SystemInfo()
{
//初始化CPU计数器
pcCpuLoad = new PerformanceCounter("Processor", "% Processor Time", "_Total");
pcCpuLoad.MachineName = ".";
pcCpuLoad.NextValue();
//CPU个数
m_ProcessorCount = Environment.ProcessorCount;
//获得物理内存
ManagementClass mc = new ManagementClass("Win32_ComputerSystem");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
if (mo["TotalPhysicalMemory"] != null)
{
m_PhysicalMemory = long.Parse(mo["TotalPhysicalMemory"].ToString());
}
}
}
#endregion
#region CPU个数
/// <summary>
/// 获取CPU个数
/// </summary>
public int ProcessorCount
{
get
{
return m_ProcessorCount;
}
}
#endregion
#region CPU占用率
/// <summary>
/// 获取CPU占用率
/// </summary>
public float CpuLoad
{
get
{
return pcCpuLoad.NextValue();
}
}
#endregion
#region 可用内存
/// <summary>
/// 获取可用内存
/// </summary>
public long MemoryAvailable
{
get
{
long availablebytes = 0;
//ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_PerfRawData_PerfOS_Memory");
//foreach (ManagementObject mo in mos.Get())
//{
// availablebytes = long.Parse(mo["Availablebytes"].ToString());
//}
ManagementClass mos = new ManagementClass("Win32_OperatingSystem");
foreach (ManagementObject mo in mos.GetInstances())
{
if (mo["FreePhysicalMemory"] != null)
{
availablebytes = 1024 * long.Parse(mo["FreePhysicalMemory"].ToString());
}
}
return availablebytes;
}
}
#endregion
#region 物理内存
/// <summary>
/// 获取物理内存
/// </summary>
public long PhysicalMemory
{
get
{
return m_PhysicalMemory;
}
}
#endregion
#region 结束指定进程
/// <summary>
/// 结束指定进程
/// </summary>
/// <param name="pid">进程的 Process ID</param>
public static void EndProcess(int pid)
{
try
{
Process process = Process.GetProcessById(pid);
process.Kill();
}
catch { }
}
#endregion
#region 查找所有应用程序标题
/// <summary>
/// 查找所有应用程序标题
/// </summary>
/// <returns>应用程序标题范型</returns>
public static List<string> FindAllApps(int Handle)
{
List<string> Apps = new List<string>();
int hwCurr;
hwCurr = GetWindow(Handle, GW_HWNDFIRST);
while (hwCurr > 0)
{
int IsTask = (WS_VISIBLE | WS_BORDER);
int lngStyle = GetWindowLongA(hwCurr, GWL_STYLE);
bool TaskWindow = ((lngStyle & IsTask) == IsTask);
if (TaskWindow)
{
int length = GetWindowTextLength(new IntPtr(hwCurr));
StringBuilder sb = new StringBuilder(2 * length + 1);
GetWindowText(hwCurr, sb, sb.Capacity);
string strTitle = sb.ToString();
if (!string.IsNullOrEmpty(strTitle))
{
Apps.Add(strTitle);
}
}
hwCurr = GetWindow(hwCurr, GW_HWNDNEXT);
}
return Apps;
}
#endregion
}
}
然后是执行代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;
namespace CSharpPerformance
{//该程序可以实时监控程序本身对应进程的工作集、私有工作集和CPU使用率
class Program
{
static void Main(string[] args)
{
//获取当前进程对象
Process cur = Process.GetCurrentProcess();
PerformanceCounter curpcp = new PerformanceCounter("Process", "Working Set - Private", cur.ProcessName);
PerformanceCounter curpc = new PerformanceCounter("Process", "Working Set", cur.ProcessName);
PerformanceCounter curtime = new PerformanceCounter("Process", "% Processor Time", cur.ProcessName);
//上次记录CPU的时间
TimeSpan prevCpuTime = TimeSpan.Zero;
//Sleep的时间间隔
int interval = 1000;
PerformanceCounter totalcpu = new PerformanceCounter("Processor", "% Processor Time", "_Total");
SystemInfo sys = new SystemInfo();
const int KB_DIV = 1024;
const int MB_DIV = 1024 * 1024;
const int GB_DIV = 1024 * 1024 * 1024;
while (true)
{
//第一种方法计算CPU使用率
//当前时间
TimeSpan curCpuTime = cur.TotalProcessorTime;
//计算
double value = (curCpuTime - prevCpuTime).TotalMilliseconds / interval / Environment.ProcessorCount * 100;
prevCpuTime = curCpuTime;
Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集(进程类)", cur.WorkingSet64 / 1024,value);//这个工作集只是在一开始初始化，后期不变
Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集 ", curpc.NextValue() / 1024,value);//这个工作集是动态更新的
//第二种计算CPU使用率的方法
Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}%", cur.ProcessName, "私有工作集 ", curpcp.NextValue() / 1024,curtime.NextValue()/Environment.ProcessorCount);
//Thread.Sleep(interval);
//第一种方法获取系统CPU使用情况
Console.Write("\r系统CPU使用率：{0}%", totalcpu.NextValue());
//Thread.Sleep(interval);
//第二章方法获取系统CPU和内存使用情况
Console.Write("\r系统CPU使用率：{0}%，系统内存使用大小：{1}MB({2}GB)", sys.CpuLoad, (sys.PhysicalMemory - sys.MemoryAvailable) / MB_DIV, (sys.PhysicalMemory - sys.MemoryAvailable) / (double)GB_DIV);
Thread.Sleep(interval);
}
Console.ReadLine();
}
}
}
以上程序可以正常运行，没隔1S刷新一次，实现动态显示本程序对应进程的CPU和内存使用情况。
原文链接：http://www.cnblogs.com/maowang1991/p/3285983.html
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