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ImageList.ImageCollection Class

Encapsulates the collection of Image objects in an ImageList.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public sealed class ImageCollection : IList, ICollection, IEnumerable
public final class ImageCollection implements IList, ICollection, 
	IEnumerable
public final class ImageCollection implements IList, ICollection, 
	IEnumerable
Not applicable.

This is used to manage the images in the ImageList programmatically, providing methods to add and remove image objects.

The following code example shows how to select, remove, and display images, from the Images property of the ImageList class, which is an ImageList.ImageCollection type.

namespace myImageRotator
{
	using System;
	using System.Drawing;
	using System.ComponentModel;
	using System.Windows.Forms;
 
	public class Form1 : System.Windows.Forms.Form
	{
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.ImageList imageList1;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		protected Graphics myGraphics;
		private System.Windows.Forms.Panel panel1;
		private System.Windows.Forms.Label label5;
		private int currentImage = 0;
 
		public Form1()
		{
			InitializeComponent();
			imageList1 = new ImageList () ;

			// The default image size is 16 x 16, which sets up a larger
			// image size. 
			imageList1.ImageSize = new Size(255,255);
			imageList1.TransparentColor = Color.White;

			// Assigns the graphics object to use in the draw options.
			myGraphics = Graphics.FromHwnd(panel1.Handle);
		}
 
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.label3 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.button4 = new System.Windows.Forms.Button();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            this.imageList1 = new System.Windows.Forms.ImageList(this.components);
            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
            this.panel1 = new System.Windows.Forms.Panel();
            this.label5 = new System.Windows.Forms.Label();
            this.SuspendLayout();

            this.listBox1.Location = new System.Drawing.Point(16, 16);
            this.listBox1.Size = new System.Drawing.Size(400, 95);
            this.listBox1.TabIndex = 0;

            this.label3.Location = new System.Drawing.Point(24, 168);
            this.label3.Text = "label3";

            this.button1.Location = new System.Drawing.Point(96, 128);
            this.button1.Size = new System.Drawing.Size(104, 23);
            this.button1.Text = "Show Next Image";
            this.button1.Click += new System.EventHandler(this.button1_Click);

            this.button2.Location = new System.Drawing.Point(208, 128);
            this.button2.Size = new System.Drawing.Size(104, 23);
            this.button2.Text = "Remove Image";
            this.button2.Click += new System.EventHandler(this.button2_Click);

            this.button3.Location = new System.Drawing.Point(320, 128);
            this.button3.Text = "Clear List";
            this.button3.Click += new System.EventHandler(this.button3_Click);

            this.button4.Location = new System.Drawing.Point(16, 128);
            this.button4.Text = "Open Image";
            this.button4.Click += new System.EventHandler(this.button4_Click);

            this.pictureBox1.Location = new System.Drawing.Point(328, 232);
            this.pictureBox1.Size = new System.Drawing.Size(336, 192);

            this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
            this.imageList1.TransparentColor = System.Drawing.Color.Transparent;

            this.panel1.Location = new System.Drawing.Point(8, 240);
            this.panel1.Size = new System.Drawing.Size(296, 184);

            this.label5.Location = new System.Drawing.Point(168, 168);
            this.label5.Size = new System.Drawing.Size(312, 40);
            this.label5.Text = "label5";

            this.ClientSize = new System.Drawing.Size(672, 461);
            this.Controls.Add(this.label5);
            this.Controls.Add(this.panel1);
            this.Controls.Add(this.pictureBox1);
            this.Controls.Add(this.button4);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.listBox1);
            this.ResumeLayout(false);
        }

        // Display the image.
        private void button1_Click (object sender, System.EventArgs e)
		{
			if(imageList1.Images.Empty != true)
			{
				if(imageList1.Images.Count-1 > currentImage)
				{
					currentImage++;
				}
				else
				{
					currentImage=0;
				}
				panel1.Refresh();
                
                // Draw the image in the panel.
				imageList1.Draw(myGraphics,10,10,currentImage);

                // Show the image in the PictureBox.
				pictureBox1.Image = imageList1.Images[currentImage];
				label3.Text = "Current image is " + currentImage ;
				listBox1.SelectedIndex = currentImage;
				label5.Text = "Image is " + listBox1.Text ;
            }
		}
 
        // Remove the image.
		private void button2_Click (object sender, System.EventArgs e)
		{
			imageList1.Images.RemoveAt(listBox1.SelectedIndex);
			listBox1.Items.Remove(listBox1.SelectedItem);
		}
 
        // Clear all images.
		private void button3_Click (object sender, System.EventArgs e)
		{
			imageList1.Images.Clear();
			listBox1.Items.Clear();
		}
 
        // Find an image.
		private void button4_Click (object sender, System.EventArgs e)
		{
			openFileDialog1.Multiselect = true ;
			if(openFileDialog1.ShowDialog() == DialogResult.OK)
			{
				if (openFileDialog1.FileNames != null)
				{
					for(int i =0 ; i < openFileDialog1.FileNames.Length ; i++ )
					{
						addImage(openFileDialog1.FileNames[i]);
					}
				}
				else
					addImage(openFileDialog1.FileName);
			}
            
		}
 
		private void addImage(string imageToLoad)
		{
			if (imageToLoad != "")
			{
				imageList1.Images.Add(Image.FromFile(imageToLoad));
				listBox1.BeginUpdate();
				listBox1.Items.Add(imageToLoad);
				listBox1.EndUpdate();
			}
		}
        [STAThread]
        public static void Main(string[] args) 
		{
			Application.Run(new Form1());
		}
	}
}

System.Object
  System.Windows.Forms.ImageList.ImageCollection

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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