using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Text;
using?System.Windows.Forms;

namespace?AsynchronousTasks
{
????public?partial?class?MainForm?:?Form
????{
????????private?System.ComponentModel.BackgroundWorker?backgroundCalculator;

????????public?MainForm（）
????????{
????????????InitializeComponent（）;

????????????//?Prepare?the?background?worker?for?asynchronous?prime?number?calculation
????????????backgroundCalculator?=?new?BackgroundWorker（）;
????????????//?Specify?that?the?background?worker?provides?progress?notifications
????????????backgroundCalculator.WorkerReportsProgress?=?true;
????????????//?Specify?that?the?background?worker?supports?cancellation
????????????backgroundCalculator.WorkerSupportsCancellation?=?true;
????????????//?The?DoWork?event?handler?is?the?main?work?function?of?the?background?thread
????????????backgroundCalculator.DoWork?+=?new?DoWorkEventHandler（backgroundCalculator_DoWork）;
????????????//?Specify?the?function?to?use?to?handle?progress?notifications
????????????backgroundCalculator.ProgressChanged?+=?new?ProgressChangedEventHandler（backgroundCalculator_ProgressChanged）;
????????????//?Specify?the?function?to?run?when?the?background?worker?finishes
????????????//?There?are?three?conditions?possible?that?should?be?handled?in?this?function:
????????????//?1.?The?work?completed?successfully
????????????//?2.?The?work?aborted?with?errors
????????????//?3.?The?user?cancelled?the?process
????????????backgroundCalculator.RunWorkerCompleted?+=?new?RunWorkerCompletedEventHandler（backgroundCalculator_RunWorkerCompleted）;

????????????updateStatus（String.Empty）;

????????}

????//?This?region?implements?calculating?primes?in?a?synchronous?fashion
????#region?Synchronous?calculation

????????//?Synchronously?calculate?the?next?prime?number?
????????//?starting?with?a?specified?number.
????????private?int?getNextPrimeSync（int?start）
????????{
????????????int?percentComplete?=?0;

????????????start++;
????????????while?（!isPrime（start））
????????????{
????????????????//?start?was?not?prime.??Try?next?number?higher.
????????????????start++;

????????????????//?Report?progress
????????????????percentComplete++;
????????????????//?With?prime?number?calculation?there?is?no?way?to?determine
????????????????//?how?far?along?you?are?so?simply?move?the?progress?bar
????????????????//?and?reset?as?needed
????????????????updateProgress（percentComplete?%?100）;
????????????}
????????????return?start;
????????}

????????private?void?nextPrimeButton_Click（object?sender?EventArgs?e）
????????{
????????????updateStatus（“Calculating...“）;

			int?start;
			Int32.TryParse（textBoxPrime.Text?out?start?）;

			if?（start?==?0）
			{
				reportError（“The?number?must?be?a?valid?integer“）;
			}
			else
			{
				try
				{
					int?prime?=?getNextPrimeSync（start）;
					reportPrime（prime）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3037??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\AsynchronousTasks.csproj

?????文件????????173??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\AsynchronousTasks.csproj.user

?????文件??????24576??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\bin\Debug\AsynchronousTasks.exe

?????文件??????32256??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\bin\Debug\AsynchronousTasks.pdb

?????文件???????5632??2005-09-23?06:56??Windows?Forms\AsynchronousTasks\AsynchronousTasks\bin\Debug\AsynchronousTasks.vshost.exe

?????目錄??????????0??2007-08-18?15:34??Windows?Forms\AsynchronousTasks\AsynchronousTasks\bin\Debug

?????目錄??????????0??2007-08-18?15:33??Windows?Forms\AsynchronousTasks\AsynchronousTasks\bin

?????文件???????8168??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Form1.cs

?????文件???????7828??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Form1.Designer.cs

?????文件???????6017??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Form1.resx

?????文件????????341??2007-08-18?15:41??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\AsynchronousTasks.csproj.FileList.txt

?????文件????????842??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\AsynchronousTasks.csproj.GenerateResource.Cache

?????文件??????24576??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\AsynchronousTasks.exe

?????文件????????180??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\AsynchronousTasks.MainForm.resources

?????文件??????32256??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\AsynchronousTasks.pdb

?????文件????????180??2007-08-18?15:34??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\AsynchronousTasks.Properties.Resources.resources

?????目錄??????????0??2007-08-18?15:33??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug\TempPE

?????目錄??????????0??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj\Debug

?????目錄??????????0??2007-08-18?15:34??Windows?Forms\AsynchronousTasks\AsynchronousTasks\obj

?????文件????????542??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Program.cs

?????文件???????1281??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties\AssemblyInfo.cs

?????文件???????2368??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties\Resources.Designer.cs

?????文件???????5612??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties\Resources.resx

?????文件???????1119??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties\Settings.Designer.cs

?????文件????????249??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties\Settings.settings

?????目錄??????????0??2007-08-18?10:12??Windows?Forms\AsynchronousTasks\AsynchronousTasks\Properties

?????文件????????900??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks\README.htm

?????目錄??????????0??2007-08-18?15:40??Windows?Forms\AsynchronousTasks\AsynchronousTasks

?????文件????????940??2005-06-29?12:28??Windows?Forms\AsynchronousTasks\AsynchronousTasks.sln

????..A..H.?????12288??2007-08-18?15:41??Windows?Forms\AsynchronousTasks\AsynchronousTasks.suo

............此處省略367個文件信息