form1.cs

案例经典

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

namespace Example121_检索类别和计数器
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.ListBox listBox2;
		/// <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 Form Designer generated code
		/// <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.button2 = new System.Windows.Forms.Button();
			this.button1 = new System.Windows.Forms.Button();
			this.listBox1 = new System.Windows.Forms.ListBox();
			this.listBox2 = new System.Windows.Forms.ListBox();
			this.SuspendLayout();
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(152, 16);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(72, 24);
			this.button2.TabIndex = 0;
			this.button2.Text = "检索类别";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(32, 16);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(88, 24);
			this.button1.TabIndex = 1;
			this.button1.Text = "检索计数器";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// listBox1
			// 
			this.listBox1.ItemHeight = 12;
			this.listBox1.Location = new System.Drawing.Point(24, 48);
			this.listBox1.Name = "listBox1";
			this.listBox1.ScrollAlwaysVisible = true;
			this.listBox1.Size = new System.Drawing.Size(112, 196);
			this.listBox1.TabIndex = 2;
			// 
			// listBox2
			// 
			this.listBox2.ItemHeight = 12;
			this.listBox2.Location = new System.Drawing.Point(152, 48);
			this.listBox2.Name = "listBox2";
			this.listBox2.ScrollAlwaysVisible = true;
			this.listBox2.Size = new System.Drawing.Size(112, 196);
			this.listBox2.TabIndex = 3;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.listBox2,
																		  this.listBox1,
																		  this.button1,
																		  this.button2});
			this.Name = "Form1";
			this.Text = "Form1";
			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 button2_Click(object sender, System.EventArgs e)
		{
			PerformanceCounterCategory[] myCat2;
			int i;
			this.listBox2.Items.Clear();
			//清除列表
			myCat2 = PerformanceCounterCategory.GetCategories();
			//得到类别
			for (i=0;i<myCat2.Length;i++)
			{
				this.listBox2.Items.Add(myCat2[i].CategoryName);
			}
			//添加类别到listBox2中

		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			this.listBox1.Items.Clear();
			//清除ListBox1中的项

			PerformanceCounterCategory mycat;
			mycat=new PerformanceCounterCategory(
				this.listBox2.SelectedItem.ToString());
			//将listBox2中选中的类别保存在mycat中    
			
			PerformanceCounter[] counters;
			try
			{
				counters=mycat.GetCounters();
				//将mycat类别中的计数器添加到counters数租中    
				foreach (PerformanceCounter counter in counters)
				{
					this.listBox1.Items.Add(counter.CounterName);
					//将计数器名称添加到listBox1
				}
			}
			catch {MessageBox.Show("不能列出此类别计数器");}

		}
	}
}