BaseEdit.ValidationErrorTemplate Property

Gets or sets the template used to display an editor’s validation error messages. This is a dependency property.

Namespace: DevExpress.Xpf.Editors

Assembly: DevExpress.Xpf.Core.v26.1.dll

Declaration

C#

public DataTemplate ValidationErrorTemplate { get; set; }

VB.NET

Public Property ValidationErrorTemplate As DataTemplate

Property Value

Type	Description
DataTemplate	A DataTemplate that defines the visualization of the editor’s error messages.

Remarks

The DataContext of elements inside the template is a BaseValidationError object. Bind to BaseValidationError.ErrorContent to display the error message, or to BaseValidationError.ErrorType to change the appearance based on error severity.

The following code sample changes the error template for all TextEdit controls nested in a DataLayoutControl:

<dx:ThemedWindow
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:InputValidationExample"
        xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol" 
        xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors" 
        xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core" 
        x:Class="InputValidationExample.MainWindow"
        Title="MainWindow" Height="450" Width="650">
    <Grid>
        <dxlc:DataLayoutControl 
            CurrentItem="{Binding}" 
            AutoGenerateItems="False" 
            HorizontalAlignment="Left" 
            Width="250">
            <dxlc:DataLayoutControl.Resources>
                <DataTemplate x:Key="errorTemplate" >
                    <Image Source="{dx:DXImage 'Images/XAF/State_Validation_Warning.png'}"/>
                </DataTemplate>
                <Style TargetType="dxe:TextEdit">
                    <Setter 
                        Property="ValidationErrorTemplate" 
                        Value="{StaticResource errorTemplate}"/>
                </Style>
            </dxlc:DataLayoutControl.Resources>
            <dxlc:DataLayoutItem Label="User ID">
                <dxe:TextEdit EditValue="{Binding UserID, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}"/>
            </dxlc:DataLayoutItem>
            <dxlc:DataLayoutItem Label="Name">
                <dxe:TextEdit EditValue="{Binding Name, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />
            </dxlc:DataLayoutItem>
        </dxlc:DataLayoutControl>
    </Grid>
</dx:ThemedWindow>

The image below illustrates the result: