RepositoryItemCheckedComboBoxEdit.AddEnum(Type, Boolean) Method

Adds new items that represent elements of the specified enumeration to the editor drop-down, allowing you to specify whether enumeration constant names or integer values are assigned to the item values.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v19.2.dll

Declaration

C#

public void AddEnum(
    Type enumType,
    bool addEnumeratorIntegerValues
)

VB.NET

Public Sub AddEnum(
    enumType As Type,
    addEnumeratorIntegerValues As Boolean
)

Parameters

Name	Type	Description
enumType	Type	The type of the required enumeration.
addEnumeratorIntegerValues	Boolean	true, if enumeration underlying integer values are assigned to the item values; otherwise, false.

Remarks

The AddEnum 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 or constant value of the enumeration underlying integer type, depending on the addEnumeratorIntegerValues parameter;
• the item Description property (see CheckedListBoxItem.Description) — is set to the value that is automatically generated based on the return value of the ToString() method invoked on the corresponding enumeration constant. You can also specify a custom method that provides an item description using the RepositoryItemCheckedComboBoxEdit.AddEnum<TEnum> method overload with the displayTextConverter parameter.

The created items are added to the RepositoryItemCheckedComboBoxEdit.Items collection.

When a specific item is selected in the CheckedComboBoxEdit control, the CheckedComboBoxEdit.EditValue property is set to the corresponding enumeration constant name or underlying integer value.

Example

The following example demonstrates how to populate the CheckedComboBoxEdit control with items using the RepositoryItemCheckedComboBoxEdit.AddEnum<TEnum> method. The image below shows the result of executing the code in the example.

C#

using System;
using System.ComponentModel;

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 CheckedComboBoxEdit with items
            // generated based on the Day enumeration constants.
            // The method parameter specifies the delagate 
            // that incapsulates the method providing
            // custom item descriptions.
            checkedComboBoxEdit1.Properties.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);
            string result = Convert.ChangeType(d, dayUnderlyingType).ToString() + ". " + d.ToString();
            if (d == Day.Sat || d == Day.Sun) result += " (weekend)";
            return result;
        }
    }
}

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 CheckedComboBoxEdit with items
            ' generated based on the Day enumeration constants.
            ' The method parameter specifies the delagate 
            ' that incapsulates the method providing
            ' custom item descriptions.
            checkedComboBoxEdit1.Properties.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)
            Dim result As String = Convert.ChangeType(d, dayUnderlyingType).ToString() + ". " + d.ToString()
            If d = Day.Sat OrElse d = Day.Sun Then
                result += " (weekend)"
            End If
            Return result
        End Function
    End Class