WPFのBackgroundWorkerのサンプル

BackgroundWorkerSample.xaml

<Window x:Class="WpfBackGroundWorker.Window1"
		xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
		xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
		Title="Window1" Height="300" Width="300">
	<Grid>
		<ProgressBar Name="ProgressBar1" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="12,12,0,0" Height="16" Width="254" Minimum="0" Maximum="100" Value="0"/>
		<Button Content="START" Height="23" HorizontalAlignment="Left" Margin="12,34,0,0" Name="btnStart" VerticalAlignment="Top" Width="75" Click="btnStart_Click"/>
		<Button Content="STOP" Height="23" HorizontalAlignment="Right" Margin="0,34,110,0" Name="btnStop" VerticalAlignment="Top" Width="75" Click="btnStop_Click"/>
	</Grid>
</Window>

BackgroundWorkerSample.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.ComponentModel;
using System.Windows.Media.Animation;
using System.Threading;

namespace WpfBackGroundWorker
{
	/// <summary>
	/// Window1.xaml の相互作用ロジック
	/// </summary>
	public partial class Window1 : Window
	{
		System.ComponentModel.BackgroundWorker Worker;

		public Window1()
		{
			InitializeComponent();
		}

		private void btnStart_Click(object sender, RoutedEventArgs e)
		{
			this.btnStart.IsEnabled = false;
			this.btnStop.IsEnabled = true;
			this.ProgressBar1.Value = 0;

			this.Worker = new System.ComponentModel.BackgroundWorker();
			this.Worker.DoWork += new System.ComponentModel.DoWorkEventHandler(Worker_DoWork);
			this.Worker.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(Worker_ProgressChanged);
			this.Worker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);

			// 進捗状況の報告をできるようにする
			this.Worker.WorkerReportsProgress = true;
			// キャンセル処理をできるようにする
			this.Worker.WorkerSupportsCancellation = true;
			// バックグラウンド処理の実行
			this.Worker.RunWorkerAsync();
		}

		private void btnStop_Click(object sender, RoutedEventArgs e)
		{
			if (this.Worker == null) return;

			// バックグラウンド処理をキャンセルする
			this.Worker.CancelAsync();

			MessageBox.Show(String.Format("現在値は{0}です", this.ProgressBar1.Value));
		}

		// 時間のかかる処理を実行
		void Worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
		{
			for (int value = 1; value <= 100; value++) {
				if (this.Worker.CancellationPending)
					break;

				this.Worker.ReportProgress(value);
				// 500mSecスリープ
				System.Threading.Thread.Sleep(100);
			}
		}

		// 現在値の更新
		void Worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
		{
			// プログレスバーの現在値を更新する
			this.ProgressBar1.Value = e.ProgressPercentage;
		}

		// 「時間のかかる処理」終了時の処理
		void Worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
		{
			// ［START］/［STOP］ボタンの初期化
			this.btnStart.IsEnabled = true;
			this.btnStop.IsEnabled = false;
			this.btnStart.IsEnabled = true;
			this.btnStop.IsEnabled = false;
		}
	}
}