form1.cs

《c#技术内幕代码》

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

namespace ch12_2
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label NumThreads;
		private System.Windows.Forms.Label Counter;
		private int                        fCounter;
		private ArrayList                  fThreadList;

		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			fThreadList = new ArrayList();

		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();

					for ( int i=0; i<fThreadList.Count; ++i )
					{
						Thread fThread = (Thread)fThreadList[ i ];
						fThread.Abort();
					}

				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.NumThreads = new System.Windows.Forms.Label();
			this.Counter = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(32, 104);
			this.button1.Name = "button1";
			this.button1.TabIndex = 0;
			this.button1.Text = "&Start";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(136, 104);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(88, 24);
			this.button2.TabIndex = 1;
			this.button2.Text = "&Stop";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(32, 40);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(152, 16);
			this.label1.TabIndex = 2;
			this.label1.Text = "Number of Threads Running:";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(32, 64);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(100, 16);
			this.label2.TabIndex = 3;
			this.label2.Text = "Counter:";
			// 
			// NumThreads
			// 
			this.NumThreads.Location = new System.Drawing.Point(192, 40);
			this.NumThreads.Name = "NumThreads";
			this.NumThreads.Size = new System.Drawing.Size(64, 16);
			this.NumThreads.TabIndex = 4;
			// 
			// Counter
			// 
			this.Counter.Location = new System.Drawing.Point(192, 64);
			this.Counter.Name = "Counter";
			this.Counter.Size = new System.Drawing.Size(64, 16);
			this.Counter.TabIndex = 5;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(272, 165);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.Counter,
																		  this.NumThreads,
																		  this.label2,
																		  this.label1,
																		  this.button2,
																		  this.button1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		protected void ThreadFunc()
		{
			Boolean done = false;
			while ( !done )
			{
				Thread.Sleep(1000);
				fCounter ++;
				this.Counter.Text = fCounter.ToString();
			}
		}


		private void button1_Click(object sender, System.EventArgs e)
		{
			Thread fThread = new Thread( new ThreadStart(ThreadFunc) );
			fThread.Start();
			fThreadList.Add( fThread );

			this.NumThreads.Text = fThreadList.Count.ToString();
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			// Stop the last one.
			Thread fThread = (Thread)fThreadList[ fThreadList.Count - 1 ];
			fThread.Abort();
			fThreadList.Remove( fThread );
			this.NumThreads.Text = fThreadList.Count.ToString();

		}
	}
}