Application.DoEvents メソッド

	private void InitializePictureBox()
	{
		this.pictureBox1 = new System.Windows.Forms.PictureBox();
		this.pictureBox1.BorderStyle = 
			System.Windows.Forms.BorderStyle.FixedSingle;
		this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
		this.pictureBox1.Location = new System.Drawing.Point(72, 112);
		this.pictureBox1.Name = "pictureBox1";
		this.pictureBox1.Size = new System.Drawing.Size(160, 136);
		this.pictureBox1.TabIndex = 6;
		this.pictureBox1.TabStop = false;
	}

	private void InitializeOpenFileDialog()
	{
		this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();

		// Set the file dialog to filter for graphics files.
		this.openFileDialog1.Filter = 
			"Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" + 
			"All files (*.*)|*.*";

		// Allow the user to select multiple images.
		this.openFileDialog1.Multiselect = true;
		this.openFileDialog1.Title = "My Image Browser";
		
	}

	private void fileButton_Click(System.Object sender, System.EventArgs e)
	{
		openFileDialog1.ShowDialog();
	}


	// This method handles the FileOK event.  It opens each file 
	// selected and loads the image from a stream into pictureBox1.
	private void openFileDialog1_FileOk(object sender, 
		System.ComponentModel.CancelEventArgs e)
	{

		this.Activate();
		 string[] files = openFileDialog1.FileNames;

		// Open each file and display the image in pictureBox1.
		// Call Application.DoEvents to force a repaint after each
		// file is read.        
		foreach (string file in files )
		{
			System.IO.FileInfo fileInfo = new System.IO.FileInfo(file);
			System.IO.FileStream fileStream = fileInfo.OpenRead();
			pictureBox1.Image = System.Drawing.Image.FromStream(fileStream);
			Application.DoEvents();
			fileStream.Close();

			// Call Sleep so the picture is briefly displayed, 
			//which will create a slide-show effect.
			System.Threading.Thread.Sleep(2000);
		}
		pictureBox1.Image = null;
	}

To run this example paste the following code in a form containing
a PictureBox named PictureBox1, an OpenFileDialog named OpenFileDialog1, 
and a button named fileButton.  Call the InitializePictureBox and 
InitializeOpenFileDialog methods from the form's constructor or 
Load method. When the example is running, display the dialog by clicking
the button.