Validation of property on keypress

[Canice]

 

Hello,

Is it possible to perform validation on keypress instead of lost focus, similar to UpdateSourceTrigger in WPF?

I'm using the WPF RadPropertyGrid control with AutoGeneratePropertyDefinitions set to true.

 

                    <t:RadPropertyGrid Name="VdiPropertyGrid"  Grid.Column="2" 
                                      Item="{Binding Path=DataContext.SelectedPropertyInspector, RelativeSource={RelativeSource FindAncestor,  AncestorType={x:Type UserControl}}}"
                                      HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"    IsGrouped ="True"                        
                                      ScrollViewer.CanContentScroll="False" ScrollViewer.VerticalScrollBarVisibility="Auto"
                                      DescriptionPanelVisibility="Visible" SearchBoxVisibility="Visible" ForceCursor="True" SelectionMode="Single" 
                                      AutoGeneratePropertyDefinitions="True"                                   
                                      AutoGeneratingPropertyDefinition="RadPropertyGrid_OnAutoGeneratingPropertyDefinition" ItemChanged="VdiPropertyGrid_ItemChanged"    >

                        <t:RadPropertyGrid.Resources>
                            <Style TargetType="{x:Type TextBox}">
                                <Style.Triggers>
                                    <Trigger Property="Validation.HasError" Value="True">
                                        <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}" />
                                    </Trigger>
                                </Style.Triggers>
                            </Style>


                        </t:RadPropertyGrid.Resources>
                    </t:RadPropertyGrid>

 

Regards,
Canice.

[Dinko | Tech Support Engineer]

Hi Canice,

Thank you for the provided code snippet.

Looking at the code snippet you have subscribe to the AutoGeneratingPropertyDefinition event. Can you try adding the following code inside the event handler? In a few words I am using the Binding property of the PropertyDefinition and setting the UpdateSourceTrigger to PropertyChanged. 

void RadPropertyGrid_OnAutoGeneratingPropertyDefinition(object sender, Telerik.Windows.Controls.Data.PropertyGrid.AutoGeneratingPropertyDefinitionEventArgs e)
{
    //  IDataErrorInfo
    (e.PropertyDefinition.Binding as Binding).ValidatesOnDataErrors = true;
    (e.PropertyDefinition.Binding as Binding).NotifyOnValidationError = true;
    (e.PropertyDefinition.Binding as Binding).UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
    //// DataAnnotations
    (e.PropertyDefinition.Binding as Binding).ValidatesOnExceptions = true;
}

In addition, you can check our RadPropertyGrid Validation SDK example in our GitHub repository.

Regards,
Dinko
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