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C# 使用 PerformanceCounter 获取 CPU 和 硬盘的使用率：

先看界面：

建一个 Windows Form  桌面程序，代码如下：

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;

namespace PerformanceCounterApp
{
    public partial class MainForm : Form
    {
        private BackgroundWorker backgroundWorker;
        private bool isWorking = false;

        public MainForm()
        {
            InitializeComponent();
        }

        private void Form_Load(object sender, EventArgs e)
        {
            cpuLabel.Text = string.Empty;
            diskLabel.Text = string.Empty;
            backgroundWorker = new BackgroundWorker();
            backgroundWorker.WorkerReportsProgress = true;
            backgroundWorker.WorkerSupportsCancellation = true;
            backgroundWorker.DoWork += BackgroundWorker_DoWork;
            backgroundWorker.ProgressChanged += BackgroundWorker_ProgressChanged;
            backgroundWorker.RunWorkerCompleted += BackgroundWorker_RunWorkerCompleted;
        }

        private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            //PerformanceCounter diskp = new PerformanceCounter("PhysicalDisk", "% Disk Time", "_Total");
            isWorking = true;
            backgroundWorker.ReportProgress(0, "Loading.../");
            PerformanceCounter cpup = new PerformanceCounter("Processor", "% Processor Time", "_Total");
            PerformanceCounter diskp = new PerformanceCounter("PhysicalDisk", "Disk Read Bytes/sec", "_Total");
            try
            {
                do
                {
                    Thread.Sleep(150);
                    var cpuv1 = (int)cpup.NextValue();
                    var diskv1 = (int)diskp.NextValue();
                    Thread.Sleep(150);
                    var cpuv2 = (int)cpup.NextValue();
                    var diskv2 = (int)diskp.NextValue();
                    Thread.Sleep(150);
                    var cpuv3 = (int)cpup.NextValue();
                    var diskv3 = (int)diskp.NextValue();
                    Thread.Sleep(150);
                    var cpuv4 = (int)cpup.NextValue();
                    var diskv4 = (int)diskp.NextValue();
                    var cpuv = (cpuv1 + cpuv2 + cpuv3 + cpuv4) / 4;
                    var diskv = (diskv1 + diskv2+ diskv3 + diskv4) / 4;
                    string data = $"{cpuv}%/{diskv}";
                    backgroundWorker.ReportProgress(0,data);
                } while (!backgroundWorker.CancellationPending);
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                cpup.Dispose();
                diskp.Dispose();
                isWorking = false;
            }
        }
        private void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            string[] data = e.UserState.ToString().Split('/');
            cpuLabel.Text = $"CPU: {data[0]}";
            diskLabel.Text = $"Disk: {data[1]} Bytes/sec";
        }
        private void BackgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            var result = e.Result;
            var cc = e.Cancelled;
        }


        private void startButton_Click(object sender, EventArgs e)
        {
            if (backgroundWorker.CancellationPending) return;
            if (isWorking)
            {
                startButton.Text = "Start";
                backgroundWorker.CancelAsync();
            }
            else
            {
                startButton.Text = "Stop";
                backgroundWorker.RunWorkerAsync();
            } 
        }

        private void Form_Closed(object sender, FormClosedEventArgs e)
        {
            if (isWorking)
            {
                startButton.Enabled = false;
                backgroundWorker.CancelAsync();
            }
        }
    }
}