スレッドでのDoEvents

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Threading;



public class SampleForm : System.Windows.Forms.Form {

	private Button button;

	private ProgressBar progressBar;

	private TextBox textBox;



	private const int waitTime = 10000;



	public SampleForm() {

		this.button = new Button();

		this.progressBar = new ProgressBar();

		this.textBox = new TextBox();



		this.button.Dock = DockStyle.Fill;

		this.button.Text = "待つよ";

		this.button.Click += new EventHandler(button_Click);



		this.progressBar.Dock = DockStyle.Bottom;

		this.progressBar.Minimum = 0;

		this.progressBar.Maximum = waitTime;



		this.textBox.Dock = DockStyle.Top;

		this.textBox.Text = "ここをいじって固まってないことを確認しる";



		this.Controls.Add(this.button);

		this.Controls.Add(this.progressBar);

		this.Controls.Add(this.textBox);

	}



	private delegate void SetProgressInvoker(int progress);

	private void SetProgress(int progress) {

		if(this.InvokeRequired) {

			this.Invoke(

				new SetProgressInvoker(this.SetProgress),

				new object[]{ progress }

			);

			return;

		}

		this.progressBar.Value = progress;

	}



	private Thread workerThread = null;

	private void DoWorks() {

		SetProgress(0);

		for(int i=1000;i<=waitTime;i+=1000) {

			Thread.Sleep(1000);

			SetProgress(i);

		}

		this.BeginInvoke(

			new CompleteWorksInvoker(this.CompleteWorks),

			new object[]{ waitTime }

		);

	}

	private delegate void CompleteWorksInvoker(int waitTime);

	private void CompleteWorks(int waitTime) {

		MessageBox.Show(this, string.Format(@"{0}[ms]待ちました", waitTime));



		this.workerThread = null;

		this.button.Enabled = true;

	}

	private void BeginWorks() {

		if(this.workerThread!=null)throw new InvalidOperationException();



		this.workerThread = new Thread(new ThreadStart(this.DoWorks));

		this.workerThread.IsBackground = true;

		this.button.Enabled = false;



		this.workerThread.Start();

	}



	private void button_Click(object sender, EventArgs e) {

		this.BeginWorks();

	}



	[STAThread]

	private static void Main() {

		Application.Run(new SampleForm());

	}

}