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_4
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ProgressBar progressBar1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private Thread fThread = null;

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

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

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

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

			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			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.progressBar1 = new System.Windows.Forms.ProgressBar();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// progressBar1
			// 
			this.progressBar1.Location = new System.Drawing.Point(24, 32);
			this.progressBar1.Name = "progressBar1";
			this.progressBar1.Size = new System.Drawing.Size(264, 23);
			this.progressBar1.TabIndex = 0;
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(24, 80);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(136, 40);
			this.button1.TabIndex = 1;
			this.button1.Text = "Start Thread";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(168, 80);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(120, 40);
			this.button2.TabIndex = 2;
			this.button2.Text = "Stop Thread";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(704, 429);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.button2,
																		  this.button1,
																		  this.progressBar1});
			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());
		}

		private void UpdateProgress() 
		{
			if (progressBar1.Value == progressBar1.Maximum) 
			{
				progressBar1.Value = progressBar1.Minimum ;
			}
			progressBar1.PerformStep() ;
		}


		public void ThreadProc() 
		{

			try 
			{
				MethodInvoker mi = new MethodInvoker(this.UpdateProgress);
				while (true) 
				{
					this.BeginInvoke(mi);
					Thread.Sleep(500) ;
				}
			}
			catch (ThreadInterruptedException e) 
			{
				Console.WriteLine("Interruption Exception in Thread: {0}", e );
			}
			catch (Exception we) 
			{
				Console.WriteLine("Exception in Thread: {0}", we );
			}
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			//Start the background thread
			fThread = new Thread(new ThreadStart(ThreadProc));
			fThread.IsBackground = true;
			fThread.Start();


		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			fThread.Interrupt();
			fThread = null;
		}
	}
}