程序代码：

using System;
using System.Collections.Generic;
using using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace Sample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private int[] count = new int[13];
        private int flag = 1;

        private void RefData()  //每一秒更新一次
        {
            PerformanceCounter pc;

            pc = new PerformanceCounter("Process", "Handle Count", "_Total");  //句柄
            count[0] = Convert.ToInt32(pc.NextValue());

            pc = new PerformanceCounter("Process", "Thread Count", "_Total");  //线程
            count[1] = Convert.ToInt32(pc.NextValue());

            Process[] p = Process.GetProcesses();  //进程
            count[2] = p.Length;

            pc = new PerformanceCounter("Memory", "Available KBytes");  //可用物理内存
            count[4] = Convert.ToInt32(pc.NextValue());

            pc = new PerformanceCounter("Memory", "Cache Bytes");  //获取系统缓存，这里不对，谁知道这里应该怎么写？
            count[5] = Convert.ToInt32(pc.NextValue() / 1024);

            pc = new PerformanceCounter("Memory", "Committed Bytes");  //使用中的物理内存
            count[6] = Convert.ToInt32(pc.NextValue() / 1024);

            pc = new PerformanceCounter("Memory", "Pool Paged Bytes");  //核心内存分页
            count[10] = Convert.ToInt32(pc.NextValue() / 1024);

            pc = new PerformanceCounter("Memory", "Pool Nonpaged Bytes"); //核心内存未分页
            count[11] = Convert.ToInt32(pc.NextValue() / 1024);

            count[9] = count[10] + count[11];  //核心内存总数，为分页和未分页核心内存的和

            if (flag == 1)
            {
                count[3] = count[4] + count[6];  //一次性统计物理内存总数,这里是使用的物理内存和没有使用中的物理内存之和，有点偏差，请问如何改？就是如何获取物理内存总量！

                pc = new PerformanceCounter("Memory", "Commit Limit");  //一次性统计最大物理内存使用量
                count[7] = Convert.ToInt32(pc.NextValue() / 1024);

                count[8] = count[6];

                flag = 0;
            }
            else
            {
                pc = new PerformanceCounter("Memory", "Committed Bytes");   //获取内存使用最大值，与前次比较
                int i = Convert.ToInt32(pc.NextValue() / 1024);
                if (i > count[8])
                {
                    count[8] = i;
                }
            }

            pc = new PerformanceCounter("Process", "Page File Bytes", "_Total");  //页面文件使用量
            count[12] = Convert.ToInt32(pc.NextValue() / 1024);
        }

        private void Form1_Load(object sender, EventArgs e)
        {          
            label4.Text = "";
            label5.Text = "";
            label6.Text = "";

            label10.Text = "";
            label11.Text = "";
            label12.Text = "";

            label16.Text = "";
            label17.Text = "";
            label18.Text = "";

            label22.Text = "";
            label23.Text = "";
            label24.Text = "";

            label25.Text = "";
            label30.Text = "";

            progressBar1.Value = 0;

            timer1.Interval = 1000;
            timer1.Enabled = true;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            RefData();

            label4.Text = count[0].ToString();
            label5.Text = count[1].ToString();
            label6.Text = count[2].ToString();

            label10.Text = count[3].ToString();
            label11.Text = count[4].ToString();
            label12.Text = count[5].ToString();

            label16.Text = count[6].ToString();
            label17.Text = count[7].ToString();
            label18.Text = count[8].ToString();

            label22.Text = count[9].ToString();
            label23.Text = count[10].ToString();
            label24.Text = count[11].ToString();

            label25.Text = (count[12] / 1024).ToString() + "MB";

            progressBar1.Value = Convert.ToInt32(count[12] / 1024.0 / 2048.0 * 100);

            label30.Text = label25.Text + "/2048MB";
        }
    }
}
/*CPU使用率的问题:
PerformanceCounter("Process","% Processor Time","_Total");
PerformanceCounter("Processor","% Processor Time","_Total");
上面两句来得到的CPU使用率时时为0，为何?(XP SP3系统，难道是不支持？)请问应该怎么写？还是有其他间接的方法？
****************/