ImageComboBoxItemCollection Class

Represents a collection of items displayed within the dropdown list of ImageComboBoxEdit editors.

Namespace: DevExpress.XtraEditors.Controls

Assembly: DevExpress.XtraEditors.v19.1.dll

Declaration

C#

public class ImageComboBoxItemCollection :
    ComboBoxItemCollection,
    IEnumerable<ImageComboBoxItem>,
    IEnumerable

VB.NET

Public Class ImageComboBoxItemCollection
    Inherits ComboBoxItemCollection
    Implements IEnumerable(Of ImageComboBoxItem),
               IEnumerable

Related API Members

The following members return ImageComboBoxItemCollection objects:

• RepositoryItemImageComboBox.Items

Remarks

The collection of items displayed within the dropdown list of an ImageComboBoxEdit editor can be accessed via the RepositoryItemImageComboBox.Items property. This property returns an ImageComboBoxItemCollection object that manages the collection of items. You can use this object’s members to add, delete, access individual items and perform other common collection management tasks.

Individual items within the collection are represented by ImageComboBoxItem objects.

Example

The following code shows how to create an ImageComboBoxEdit control at runtime. In the custom AddItems method, several items are added using the ImageComboBoxItemCollection.Add method. For each item, we specify the caption, value and image index. The ImageCollection that stores images for items is created and populated at design time. It is assigned to the RepositoryItemImageComboBox.SmallImages property, providing images for items.

The ComboBoxEdit.SelectedIndexChanged event is used to display information on the selected item. The event handler displays the caption, value and index of the selected item in the form’s title.

The following image shows the form when the last item is selected.

C#

using DevExpress.Utils;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Controls;

//ImageCollection storing images for items
private DevExpress.Utils.ImageCollection imageCollection1;

//image combo box editor created at runtime
DevExpress.XtraEditors.ImageComboBoxEdit rtImageComboBox;

private void Form1_Load(object sender, EventArgs e) {
    rtImageComboBox = CreateImageComboBoxEdit(new Rectangle(220, 10, 120, 20), this);
    AddItems(rtImageComboBox, imageCollection1);
    //select the last item
    rtImageComboBox.SelectedIndex = rtImageComboBox.Properties.Items.Count - 1;
}

//create the editor
private ImageComboBoxEdit CreateImageComboBoxEdit(Rectangle bounds, Control container) {
    ImageComboBoxEdit editor = new ImageComboBoxEdit();
    editor.Bounds = bounds;
    container.Controls.Add(editor);
    editor.SelectedIndexChanged += new EventHandler(imageComboBoxEdit_SelectedIndexChanged);
    return editor;
}

//add items
private void AddItems(ImageComboBoxEdit editor, ImageCollection imgList) {
    for (int i = 0; i < 7; i++)
        editor.Properties.Items.Add(new ImageComboBoxItem("Item " + (i + 1).ToString(), i, i));
    editor.Properties.SmallImages = imgList;
}

//display information on the selected item
void imageComboBoxEdit_SelectedIndexChanged(object sender, EventArgs e) {
    ImageComboBoxEdit editor = sender as ImageComboBoxEdit;
    this.Text = "SelectedIndexChanged: index " + editor.SelectedIndex.ToString() +
        " / value " + editor.EditValue.ToString() + " / display text " + editor.Text;
}

VB.NET

Imports DevExpress.Utils
Imports DevExpress.XtraEditors
Imports DevExpress.XtraEditors.Controls

'image combo box editor created at runtime
Private rtImageComboBox As DevExpress.XtraEditors.ImageComboBoxEdit

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _
  Handles MyBase.Load
    rtImageComboBox = CreateImageComboBoxEdit(New Rectangle(220, 10, 120, 20), Me)
    AddItems(rtImageComboBox, imageList1)
    rtImageComboBox.SelectedIndex = rtImageComboBox.Properties.Items.Count - 1
End Sub

'create the editor
Private Function CreateImageComboBoxEdit(ByVal bounds As Rectangle, _
  ByVal container As Control) As ImageComboBoxEdit
    Dim editor As New ImageComboBoxEdit
    editor.Bounds = bounds
    container.Controls.Add(editor)
    AddHandler editor.SelectedIndexChanged, _
      New EventHandler(AddressOf imageComboBoxEdit_SelectedIndexChanged)
    Return editor
End Function

'add items
Private Sub AddItems(ByVal editor As DevExpress.XtraEditors.ImageComboBoxEdit, _
  ByVal imgList As ImageCollection)
    For i As Integer = 0 To 6
        editor.Properties.Items.Add(New ImageComboBoxItem("Item " & (i + 1).ToString(), i, i))
    Next
    editor.Properties.SmallImages = imgList
End Sub

'display information on a selected item
Sub imageComboBoxEdit_SelectedIndexChanged(ByVal sender As Object, _
  ByVal e As EventArgs)
    Dim editor As ImageComboBoxEdit = CType(sender, ImageComboBoxEdit)
    Me.Text = "SelectedIndexChanged: index " + editor.SelectedIndex.ToString() + _
     " / value " + editor.EditValue.ToString() + " / display text " + editor.Text
End Sub

Inheritance

Object

CollectionBase

ComboBoxItemCollection

ImageComboBoxItemCollection