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ImageList.ImageCollection Class

Definition

Encapsulates the collection of Image objects in an ImageList.

C#
public sealed class ImageList.ImageCollection : System.Collections.IList
Inheritance
ImageList.ImageCollection
Implements

Examples

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.

C#
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)
            {
                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());
        }
    }
}

Remarks

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

Properties

Count

Gets the number of images currently in the list.

Empty

Gets a value indicating whether the ImageList has any images.

IsReadOnly

Gets a value indicating whether the list is read-only.

Item[Int32]

Gets or sets an Image at the specified index within the collection.

Item[String]

Gets an Image with the specified key from the collection.

Keys

Gets the collection of keys associated with the images in the ImageList.ImageCollection.

Methods

Add(Icon)

Adds the specified icon to the ImageList.

Add(Image, Color)

Adds the specified image to the ImageList, using the specified color to generate the mask.

Add(Image)

Adds the specified image to the ImageList.

Add(String, Icon)

Adds an icon with the specified key to the end of the collection.

Add(String, Image)

Adds an image with the specified key to the end of the collection.

AddRange(Image[])

Adds an array of images to the collection.

AddStrip(Image)

Adds an image strip for the specified image to the ImageList.

Clear()

Removes all the images and masks from the ImageList.

Contains(Image)

Not supported. The Contains(Object) method indicates whether a specified object is contained in the list.

ContainsKey(String)

Determines if the collection contains an image with the specified key.

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetEnumerator()

Returns an enumerator that can be used to iterate through the item collection.

GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
IndexOf(Image)

Not supported. The IndexOf(Object) method returns the index of a specified object in the list.

IndexOfKey(String)

Determines the index of the first occurrence of an image with the specified key in the collection.

MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
Remove(Image)

Not supported. The Remove(Object) method removes a specified object from the list.

RemoveAt(Int32)

Removes an image from the list.

RemoveByKey(String)

Removes the image with the specified key from the collection.

SetKeyName(Int32, String)

Sets the key for an image in the collection.

ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

ICollection.CopyTo(Array, Int32)

Copies the items in this collection to a compatible one-dimensional array, starting at the specified index of the target array.

ICollection.IsSynchronized

Gets a value indicating whether access to the collection is synchronized (thread safe).

ICollection.SyncRoot

Gets an object that can be used to synchronize access to the collection.

IList.Add(Object)

Adds the specified image to the ImageList.

IList.Contains(Object)

This API supports the product infrastructure and is not intended to be used directly from your code.

Implements the Contains(Object) method. Throws a NotSupportedException in all cases.

IList.IndexOf(Object)

This API supports the product infrastructure and is not intended to be used directly from your code.

Implements the IndexOf(Object) method. Throws a NotSupportedException in all cases.

IList.Insert(Int32, Object)

Implements the Insert(Int32, Object) method. Throws a NotSupportedException in all cases.

IList.IsFixedSize

Gets a value indicating whether the ImageList.ImageCollection has a fixed size.

IList.Item[Int32]

Gets or sets an image in an existing ImageList.ImageCollection.

IList.Remove(Object)

Implements the Remove(Object). Throws a NotSupportedException in all cases.

Extension Methods

Cast<TResult>(IEnumerable)

Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable)

Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable)

Enables parallelization of a query.

AsQueryable(IEnumerable)

Converts an IEnumerable to an IQueryable.

Applies to

Product Versions
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9