BaseListBoxControl.AddEnum<TEnum>(Converter<TEnum, String>) Method

Adds new items that represent elements of the specified enumeration to the control, allowing you to customize item descriptions.

Namespace: DevExpress.XtraEditors

Assembly: DevExpress.XtraEditors.v24.2.dll

Declaration

C#

public void AddEnum<TEnum>(
    Converter<TEnum, string> displayTextConverter
)

VB.NET

Public Sub AddEnum(Of TEnum)(
    displayTextConverter As Converter(Of TEnum, String)
)

Parameters

Name	Type	Description
displayTextConverter	Converter<TEnum, String>	A System.Converter delegate that generates item descriptions.

Type Parameters

Name
TEnum

Remarks

The AddEnum<TEnum> method retrieves an array of the constants in the specified enumeration. Based on the retrieved constants, the ListBoxItem objects are created:

• the item Value property (see ListBoxItem.Value) — is set to the corresponding enumeration constant name. Instead of the enumeration constant name, the Value property can also be set to the constant value of the enumeration underlying integer type. For this purpose, call the BaseListBoxControl.AddEnum method overload with the addEnumeratorIntegerValues parameter set to true;
• the item Description property (see CheckedListBoxItem.Description and ImageListBoxItem.Description) — is set to the value generated by the delegate specified with the displayTextConverter parameter.

The created items are added to the Items (see BaseCheckedListBoxControl.Items and BaseImageListBoxControl.Items) collection.

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