ValidationEventArgs.IsValid Property

Gets or sets a value specifying whether the value is valid.

Namespace: DevExpress.Xpf.Editors

Assembly: DevExpress.Xpf.Core.v19.2.dll

Declaration

C#

public bool IsValid { get; set; }

VB.NET

Public Property IsValid As Boolean

Property Value

Type	Description
Boolean	true if the value is valid; otherwise, false.

Remarks

Use the IsValid property to specify whether a new value meets your validation criteria, and can be posted to the editor.

If the entered value is not valid, set the IsValid property to false. In this instance, this value will not be posted to the editor and an error icon defined by the ValidationEventArgs.ErrorType, will be displayed within the editor. The error description (error tooltip) can be specified using the ValidationEventArgs.ErrorContent property.

Related GitHub Examples

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

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#

dxscheduler-for-wpf-complete-implementation-of-a-custom-edit-appointment-form-e3374/CS/CustomAppointmentForm.xaml.cs#L137

    return;
e.IsValid = IsValidInterval(Controller.Start.Date, Controller.Start.Date.TimeOfDay, Controller.End.Date, ((DateTime)e.Value).TimeOfDay);
e.ErrorContent = SchedulerLocalizer.GetString(SchedulerStringId.Msg_InvalidEndDate);

how-to-change-the-appearance-of-editors-when-validation-error-occurs-e3097/CS/WPFCustomValidationErrorPresenter/MainWindow.xaml.cs#L30

if (parameter > 3) {
    e.IsValid = false;
    e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Default;

wpf-data-grid-validate-data-rows/CS/DXGrid_ValidateRow/Window1.xaml.cs#L28

    DateTime endDate = ((Task)e.Row).EndDate;
    e.IsValid = startDate < endDate;
}

mvvm-how-to-use-validationrules-to-validate-values-entered-into-gridcontrol-e3233/CS/WpfApplication1/GridColumnValidationHelper.cs#L40

if(!result.IsValid) {
    e.IsValid = false;
    e.ErrorContent = result.ErrorContent;

wpf-data-grid-initialize-new-item-row-with-default-values/CS/DXGrid_NewItemRow/Window1.xaml.cs#L22

if (e.RowHandle == GridControl.NewItemRowHandle) {
    e.IsValid = !string.IsNullOrEmpty(((Person)e.Row).ProductName);
    e.Handled = true;

VB.NET

how-to-change-the-appearance-of-editors-when-validation-error-occurs-e3097/VB/WPFCustomValidationErrorPresenter/MainWindow.xaml.vb#L32

If parameter > 3 Then
    e.IsValid = False
    e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Default

wpf-data-grid-validate-data-rows/VB/DXGrid_ValidateRow/Window1.xaml.vb#L21

    Dim endDate As Date = CType(e.Row, Task).EndDate
    e.IsValid = startDate < endDate
End Sub

mvvm-how-to-use-validationrules-to-validate-values-entered-into-gridcontrol-e3233/VB/WpfApplication1/GridColumnValidationHelper.vb#L46

If (Not result.IsValid) Then
    e.IsValid = False
    e.ErrorContent = result.ErrorContent

wpf-data-grid-initialize-new-item-row-with-default-values/VB/DXGrid_NewItemRow/Window1.xaml.vb#L24

If e.RowHandle = DataControlBase.NewItemRowHandle Then
    e.IsValid = Not String.IsNullOrEmpty(CType(e.Row, Person).ProductName)
    e.Handled = True

validate-cell-editors/VB/DXGrid_ValidatingEditors/Window1.xaml.vb#L32

If Not(discount > 0 AndAlso discount <= 30) Then
    e.IsValid = False
    e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Critical