RepositoryItemRadioGroup.SelectedIndexChanged Event

Occurs on changing the index of the selected item in the radio group editor.

Namespace: DevExpress.XtraEditors.Repository

Assembly: DevExpress.XtraEditors.v24.1.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

[DXCategory("Events")]
public event EventHandler SelectedIndexChanged

VB.NET

<DXCategory("Events")>
Public Event SelectedIndexChanged As EventHandler

Event Data

The SelectedIndexChanged event's data class is EventArgs.

Remarks

The SelectedIndexChanged event occurs on changing the value of the RadioGroup.SelectedIndex property. This property provides the index of the selected item, within the RepositoryItemRadioGroup.Items collection.

The index of the selected value is changed when:

• another item is selected. In this case, RadioGroup.SelectedIndex is set to the index of the selected item.
• when the specified BaseEdit.EditValue value does not belong to the collection. In this instance, RadioGroup.SelectedIndex is set to -1.

You can handle the SelectedIndexChanged event to get notification that the user has selected another item from the RepositoryItemRadioGroup.Items collection.

The editor’s RadioGroup.SelectedIndexChanged event is equivalent to the current one.

Example

This example demonstrates how to programmatically create a radio group, add two items to the collection, initialize their properties and assign a handler to the RadioGroup.SelectedIndexChanged event. The created radio group will be used to control the visibility of a standard button control. This example assumes that a button has already been placed on the form.

The image below shows the example application.

C#

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

// ...
public Form1() {
   InitializeComponent();
   CreateRadioEditors();
}

private void CreateRadioEditors() {
    // Creates and initializes radio group items
    RadioGroupItem item1 = new RadioGroupItem();
    item1.Description = "Hide Button";
    RadioGroupItem item2 = new RadioGroupItem();
    item2.Description = "Show Button";
    // Creates and initializes the radio group
    RadioGroup radioEdit1 = new RadioGroup();
    radioEdit1.Properties.Items.Add(item1);
    radioEdit1.Properties.Items.Add(item2);
    radioEdit1.Name = "radioEdit1";
    radioEdit1.Location = new System.Drawing.Point(button1.Location.X, button1.Location.Y + 40);
    radioEdit1.Width = button1.Width;
    radioEdit1.Height = 100;
    // Sets the editor's selection based on the button's visibility
    if (button1.Visible) radioEdit1.SelectedIndex = 1;
    // Assigns a handler for the SelectedIndexChanged event
    radioEdit1.SelectedIndexChanged += new EventHandler(SelectedIndexChanged);
    this.Controls.Add((Control)radioEdit1);
}

private void SelectedIndexChanged(object sender, System.EventArgs e) {
    RadioGroup edit = sender as RadioGroup;
    if (edit.SelectedIndex == 0) button1.Visible = false;
    else button1.Visible = true;
}

VB.NET

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

Public Sub New()
   InitializeComponent()
   CreateRadioEditors()
End Sub

Private Sub CreateRadioEditors()
    ' Creates and initializes radio group items
    Dim item1 As New RadioGroupItem()
    item1.Description = "Hide Button"
    Dim item2 As New RadioGroupItem()
    item2.Description = "Show Button"
    ' Creates and initializes the radio group
    Dim radioEdit1 As New RadioGroup()
    radioEdit1.Properties.Items.Add(item1)
    radioEdit1.Properties.Items.Add(item2)
    radioEdit1.Name = "radioEdit1"
    radioEdit1.Location = New System.Drawing.Point(button1.Location.X, button1.Location.Y + 40)
    radioEdit1.Width = button1.Width
    radioEdit1.Height = 100
    ' Sets the editor's selection based on the button's visibility
    If button1.Visible Then
        radioEdit1.SelectedIndex = 1
    End If
    ' Assigns a handler for the SelectedIndexChanged event
    AddHandler radioEdit1.SelectedIndexChanged, AddressOf SelectedIndexChanged
    Me.Controls.Add(CType(radioEdit1, Control))
End Sub

Private Sub SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim edit As RadioGroup = TryCast(sender, RadioGroup)
    If edit.SelectedIndex = 0 Then
        button1.Visible = False
    Else
        button1.Visible = True
    End If
End Sub