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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Diagnostics;

namespace MyCounter
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.ListBox listBox2;
		private System.Windows.Forms.Label label2;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.listBox1 = new System.Windows.Forms.ListBox();
			this.button1 = new System.Windows.Forms.Button();
			this.listBox2 = new System.Windows.Forms.ListBox();
			this.label2 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 12);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(72, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "显示类别：";
			// 
			// listBox1
			// 
			this.listBox1.ItemHeight = 12;
			this.listBox1.Location = new System.Drawing.Point(8, 32);
			this.listBox1.Name = "listBox1";
			this.listBox1.Size = new System.Drawing.Size(360, 112);
			this.listBox1.TabIndex = 1;
			this.listBox1.SelectedIndexChanged  = new System.EventHandler(this.listBox1_SelectedIndexChanged);
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(272, 8);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(96, 23);
			this.button1.TabIndex = 2;
			this.button1.Text = "检索类别";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// listBox2
			// 
			this.listBox2.ItemHeight = 12;
			this.listBox2.Location = new System.Drawing.Point(8, 168);
			this.listBox2.Name = "listBox2";
			this.listBox2.Size = new System.Drawing.Size(360, 112);
			this.listBox2.TabIndex = 4;
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(8, 152);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(352, 16);
			this.label2.TabIndex = 3;
			this.label2.Text = "显示计数器(先从显示类别列表中选择)：";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(376, 286);
			this.Controls.Add(this.listBox2);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.listBox1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示计数器查询";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		
		private void button1_Click(object sender, System.EventArgs e)
		{//检索类别
			this.listBox1.Items.Clear();
			PerformanceCounterCategory[]  MyType=PerformanceCounterCategory.GetCategories();			
			for (int i=0;i<MyType.Length;i  )
			{
				this.listBox1.Items.Add(MyType[i].CategoryName);
			}			
		}

		private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
		{//检索计数器
			this.listBox2.Items.Clear();
			PerformanceCounterCategory MyType=new PerformanceCounterCategory(this.listBox1.SelectedItem.ToString());
			try
			{
				PerformanceCounter[] MyCounters=MyType.GetCounters();
				foreach (PerformanceCounter Counter in MyCounters)
				{
					this.listBox2.Items.Add(Counter.CounterName);					
				}
			}
			catch(Exception Err)
			{
				MessageBox.Show("获取计数器信息出现错误：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
	}
}