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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

CheckedComboBoxEdit Class

An editor that displays a list of check boxes in a drop-down menu. Users can select multiple items.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v19.1.dll

Expanded Syntax

Expanded Remarks

Populate a CheckedComboBox with Items

You can populate a CheckedComboBox with items manually, bind it to a data source, or pass a bit field (flag) enumerator to the editor so that it converts all flags into items.

Add Items Manually

Open the editor smart tag menu and click "Edit Items".

In code, you can modify the Items collection.

Populate with Bit Fields (Flags)

To auto-populate a CheckedComboBox editor with flags, use the RepositoryItemCheckedComboBoxEdit.SetFlags method.

The following figure illustrates the result. Note that the flag that has the "0" value ("None" in the sample above) is selected when all other items are unchecked.

CheckedComboBoxEdit does not support combined flags (values that combine two or more regular flags). If you use an enumeration with such flags, remove them from the editor Items collection as shown in the following sample.

Bind to a Data Source

To populate a CheckedComboBoxEdit from an external source, you need to specify three properties.

You can set up all three settings at design time: invoke the smart tag menu and check the "Use data bound items" option.

See the Data Binding Common Concepts section to for more information.

Item Settings

  • ListBoxItem.Value - every list box item must have a unique value. This value is used to identify currently selected items. In the code sample from the "Add Items" section above, the first parameter of each "Add" method is an item value.

  • CheckedListBoxItem.Description - if you do not specify this property, users will see item values converted to strings at runtime. The Description property allows you to set up visible item captions that differ from values.

  • CheckedListBoxItem.CheckState - allows you to identify whether the item is checked, and change its check state in code. Note that although the CheckState enumeration provides the "Indeterminate" value, the editor does not support this state and displays all indeterminate items as unchecked.

  • CheckedListBoxItem.Enabled - set this property to false to disable the item.

Get Checked Items

The editor's EditValue property returns a combination of all checked items' values. For non-flag items, this is a string that contains item values, separators (comma by default, you can change the separator with the RepositoryItemCheckedComboBoxEdit.SeparatorChar property), and spaces.

For editors that display bit fields, the EditValue property returns an object of the flag enumerator type.

If you change the RepositoryItemCheckedComboBoxEdit.EditValueType to "EditValueTypeCollection.List", EditValue for an editor that shows non-flag items will return a System.Collections.Generic.List<object> instead of a string.

You can also call the RepositoryItemCheckedComboBoxEdit.GetCheckedItems method instead of reading the EditValue property value.

Set Checked Items

There are multiple ways to check or uncheck items.

  • You cannot modify the EditValue property directly for standalone CheckedComboBoxEdit controls. Instead, use the SetEditValue method.
  • Call the CheckAll method to check all editor items at once.

Limit the Maximum Checked Item Number

CheckedComboBox editors are designed to allow users to check any number of drop-down list items they need.

  • If you need no more than one item checked at a time, use the ComboBoxEdit or LookUpEdit editor instead.

  • If you need to limit a number of simultaneously checked items (more than one), handle the editor's Popup event to access an embedded CheckedListBoxControl and modify its behavior. The sample below locks all drop-down list items when there are three checked items.

Additional Settings

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          System.Windows.Forms.Control
             ControlBase
                BaseControl
                   BaseEdit
                      TextEdit
                         ButtonEdit
                            PopupBaseEdit
                               PopupContainerEdit
                                  CheckedComboBoxEdit

Expanded See Also

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