View Image Files

// view jpeg, bitmap and gif (also animated) images
// this is a Windows GUI program with Buttons, ListBox, PictureBox,
// and an OpenFileDialog
// compiled with C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe

using System;
using System.Drawing;        // image
//using System.Collections;
using System.Windows.Forms;  // GUI stuff
using System.IO;             // Path.GetFileName()

namespace PicView1
{
    // summary description for Form1.
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.Button OpenFileButton;
        private System.Windows.Forms.OpenFileDialog openFileDialog1;
        private System.Windows.Forms.PictureBox pictureBox1;
        private System.Windows.Forms.Button QuitButton;
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            InitializeComponent();
        }
        
        // a must, clean up any resources being used
        protected override void Dispose( bool disposing )
        {
            if (disposing)
            {
                if (components != null) 
                {
                     components.Dispose();
                }
            }
            base.Dispose(disposing);
        }

        // these are the GUI components used
        private void InitializeComponent()
        {
            this.QuitButton = new System.Windows.Forms.Button();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
            this.OpenFileButton = new System.Windows.Forms.Button();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // QuitButton
            // 
            this.QuitButton.Location = new System.Drawing.Point(440, 344);
            this.QuitButton.Name = "QuitButton";
            this.QuitButton.Size = new System.Drawing.Size(144, 23);
            this.QuitButton.TabIndex = 1;
            this.QuitButton.Text = "Quit";
            this.QuitButton.Click += new System.EventHandler(this.QuitButton_Click);
            // 
            // pictureBox1
            // 
            this.pictureBox1.Location = new System.Drawing.Point(8, 8);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(424, 360);
            this.pictureBox1.TabIndex = 2;
            this.pictureBox1.TabStop = false;
            // 
            // openFileDialog1
            // 
            this.openFileDialog1.Filter = "jpeg|*.jpg|Bitmap|*.bmp|gif|*.gif";
            this.openFileDialog1.Title = "Open Image File";
            // 
            // OpenFileButton
            // 
            this.OpenFileButton.Location = new System.Drawing.Point(440, 8);
            this.OpenFileButton.Name = "OpenFileButton";
            this.OpenFileButton.Size = new System.Drawing.Size(144, 23);
            this.OpenFileButton.TabIndex = 0;
            this.OpenFileButton.Text = "Open File";
            this.OpenFileButton.Click += new System.EventHandler(this.OpenFileButton_Click);
            // 
            // listBox1
            // 
            this.listBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
            this.listBox1.ItemHeight = 16;
            this.listBox1.Location = new System.Drawing.Point(440, 48);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(144, 276);
            this.listBox1.TabIndex = 3;
            this.listBox1.SelectedIndexChanged += new System.EventHandler(this.ListBox1SelectedIndexChanged);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
            this.ClientSize = new System.Drawing.Size(592, 376);
            this.Controls.Add(this.listBox1);
            this.Controls.Add(this.pictureBox1);
            this.Controls.Add(this.QuitButton);
            this.Controls.Add(this.OpenFileButton);
            this.Name = "Form1";
            this.Text = "Picture Viewer";
            this.ResumeLayout(false);
        }

        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void OpenFileButton_Click(object sender, System.EventArgs e)
        {
            string fname;
          
            // show the openFile dialog box
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                fname = openFileDialog1.FileName;
                pictureBox1.Image = Image.FromFile(fname);
                this.Text = String.Concat("Viewer (" + fname + ")");
                listBox1.Items.Add(Path.GetFileName(fname));
            }
        }

        private void QuitButton_Click(object sender, System.EventArgs e)
        {
            this.Close();
        }
        
        // select past filename from the ListBox items
        void ListBox1SelectedIndexChanged(object sender, System.EventArgs e)
        {
            string fname = listBox1.SelectedItems[0].ToString();
            this.Text = fname;
            pictureBox1.Image = Image.FromFile(fname);
        }
    }
}