ChangingEventArgs Class

Provides data for the RepositoryItem.EditValueChanging event.

Namespace: DevExpress.XtraEditors.Controls

Assembly: DevExpress.XtraEditors.v18.1.dll

Declaration

C#

public class ChangingEventArgs :
    CancelEventArgs

VB.NET

Public Class ChangingEventArgs
    Inherits CancelEventArgs

Related API Members

ChangingEventArgs is the data class for the following events:

• BaseEdit.EditValueChanging
• RepositoryItem.EditValueChanging

Remarks

The RepositoryItem.EditValueChanging event is raised when the edit value is about to be changed. It enables you to prevent the value from changing. Thus, the CancelEventArgs class introduces the ChangingEventArgs.NewValue and ChangingEventArgs.OldValue properties that identify the potential and current edit values. The inherited Cancel property can be used to cancel the action.

ChangingEventArgs objects are automatically created, modified and passed to RepositoryItem.EditValueChanging event handlers.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the ChangingEventArgs class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

mvvm-best-practices-t228317/CS/SimpleBehaviors/ConfirmationBehaviorGenericConfirmationBehaviorClassUserControl.cs#L27

// UI binding for the generic ConfirmationBehavior behavior with some specific parameters
mvvmContext.AttachBehavior<ConfirmationBehavior<ChangingEventArgs>>(editor,
    behavior =>

how-to-create-a-custom-rangetrackbarcontrol-with-multiple-tick-marks-e4443/CS/CustomRangeTrackBar.cs#L76

protected override void OnEditValueChanging(DevExpress.XtraEditors.Controls.ChangingEventArgs e)
{

how-to-create-a-custom-font-edit-control-that-supports-a-skinned-font-dialog-e3683/CS/CustomControlBinder.cs#L56

static void TextEdit_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
{

how-to-create-a-text-editor-to-show-auto-completion-suggestions-in-the-popup-e3055/CS/TextEditPopUp/RepositoryItemTextEditPopUp.cs#L67

void RepositoryItemTextEditPopUp_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
{

how-to-validate-the-image-inserted-into-the-picture-editor-e820/CS/Form1.cs#L117

private void pictureEdit1_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e) {
    const int ImgWidth = 24;

VB.NET

mvvm-best-practices-t228317/VB/SimpleBehaviors/ConfirmationBehaviorGenericConfirmationBehaviorClassUserControl.vb#L25

' UI binding for the generic ConfirmationBehavior behavior with some specific parameters
mvvmContext.AttachBehavior(Of ConfirmationBehavior(Of ChangingEventArgs))(editor,
                  Sub(behavior)

how-to-create-a-custom-rangetrackbarcontrol-with-multiple-tick-marks-e4443/VB/CustomRangeTrackBar.vb#L82

Protected Overrides Sub OnEditValueChanging(ByVal e As DevExpress.XtraEditors.Controls.ChangingEventArgs)
    lockEditValueChanged = True

how-to-create-a-custom-font-edit-control-that-supports-a-skinned-font-dialog-e3683/VB/CustomControlBinder.vb#L53

Private Shared Sub TextEdit_EditValueChanging(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.Controls.ChangingEventArgs)
    Dim currentTextEdit As TextEdit = TryCast(sender, TextEdit)

how-to-create-a-text-editor-to-show-auto-completion-suggestions-in-the-popup-e3055/VB/TextEditPopUp/RepositoryItemTextEditPopUp.vb#L70

Private Sub RepositoryItemTextEditPopUp_EditValueChanging(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.Controls.ChangingEventArgs)
    If e.NewValue IsNot Nothing Then

how-to-validate-the-image-inserted-into-the-picture-editor-e820/VB/Form1.vb#L111

Private Sub pictureEdit1_EditValueChanging(ByVal sender As Object, ByVal e As DevExpress.XtraEditors.Controls.ChangingEventArgs) Handles pictureEdit1.EditValueChanging
    Const ImgWidth As Integer = 24

Inheritance

Object

EventArgs

CancelEventArgs

ChangingEventArgs

ItemCheckingEventArgs