RepositoryItemImageComboBox.AddEnum<TEnum>() Method

Populates this RepositoryItemImageComboBox with items generated from values of the specific enumeration.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v24.1.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

public void AddEnum<TEnum>()

VB.NET

Public Sub AddEnum(Of TEnum)

Type Parameters

Name
TEnum

Remarks

Many DevExpress editors and control provide the capability to fetch enumeration values and generate items using these values. To do this, use the required AddEnum/AddEnum<T> method overload. These overloads provide various parameters.

• addEnumeratorIntegerValues

  Typically, an editor item has the Value and Description properties. An item value is passed to the editor’s BaseEdit.EditValue property, while an item description is shown to end-users on screen. By default, when you populate an editor from an enumeration, these two values are the same. If the addEnumeratorIntegerValues parameter is set to true, item values will store numeric constants related to enumeration values, not their constant names.

• displayTextConverter

  This parameter allows you to specify a delegate that encapsulates a method which modifies item descriptions. Note that you can do the same thing by declaring Description attributes before enumeration values as shown below.

  C#

  public enum Actions {
      Add = 2,
      Remove = 4,
      New = 8,
      Save = 16,
      [Description("Save All")]
      SaveAll = 32,
      None
  }
  

  VB.NET

  Public Enum Actions
      Add = 2
      Remove = 4
      [New] = 8
      Save = 16
      <Description("Save All")>
      SaveAll = 32
      None
  End Enum
  

• skipComposite

  When set to true, this parameter prevents the editor from generating items that correspond to enumeration values with composite bit-flags. Refer to the Non-exclusive members and the Flags attribute article section to learn more.

• skipNone

  This parameter allows you to skip enumeration values that do not have manually assigned numeric values.

The figure below illustrates various DevExpress editors populated from a sample enumeration.

Example

The following example shows how to populate the CheckedListBoxControl and ImageListBoxControl with items using the BaseListBoxControl.AddEnum and BaseListBoxControl.AddEnum<TEnum> methods.

The image below shows the result of executing the code in the example. It is assumed that the controls are dropped on the form at design time.

C#

using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public enum Day {
        // The Description attribute can be used
        // to provide descriptions for items.
        [Description("Saturday")]
        Sat = 7,
        Sun = 1,
        Mon,
        Tue,
        Wed,
        Thu,
        Fri
    };
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        public Form1() {
            InitializeComponent();
            // Populates the CheckedListBoxControl with items
            // generated based on the Day enumeration constants.
            // The second parameter set to true specifies
            // item values to be set to enumeration constant
            // integer values instead of constant names.
            checkedListBoxControl1.AddEnum(typeof(Day), true);

            // Populates the ImageListBoxControl with items
            // generated based on the Day enumeration constants.
            // The method parameter specifies the delegate 
            // that encapsulates the method providing
            // custom item descriptions.
            imageListBoxControl1.AddEnum<Day>(new Converter<Day,string>(MyConverter));
        }

        // Returns a custom string based on the specified day.
        public static string MyConverter(Day d) {
            Type dayType = d.GetType();
            Type dayUnderlyingType = Enum.GetUnderlyingType(dayType);
            return Convert.ChangeType(d, dayUnderlyingType).ToString() + ". " + d.ToString();
        }
    } 
}

VB.NET

Imports System.ComponentModel

    Public Enum Day
        ' The Description attribute can be used
        ' to provide descriptions for items.
        <Description("Saturday")> _
        Sat = 7
        Sun = 1
        Mon
        Tue
        Wed
        Thu
        Fri
    End Enum
    Public Partial Class Form1
        Inherits DevExpress.XtraEditors.XtraForm 
        Public Sub New()
            InitializeComponent()
            ' Populates the CheckedListBoxControl with items
            ' generated based on the Day enumeration constants.
            ' The second parameter set to true specifies
            ' item values to be set to enumeration constant
            ' integer values instead of constant names.
            checkedListBoxControl1.AddEnum(GetType(Day), True)

            ' Populates the ImageListBoxControl with items
            ' generated based on the Day enumeration constants.
            ' The method parameter specifies the delegate 
            ' that encapsulates the method providing
            ' custom item descriptions.
            imageListBoxControl1.AddEnum(Of Day)(New Converter(Of Day, String)(AddressOf MyConverter))
        End Sub

        ' Returns a custom string based on the specified day.
        Public Shared Function MyConverter(d As Day) As String
            Dim dayType As Type = d.[GetType]()
            Dim dayUnderlyingType As Type = [Enum].GetUnderlyingType(dayType)
            Return Convert.ChangeType(d, dayUnderlyingType).ToString() + ". " + d.ToString()
        End Function
    End Class