FAQ Database Discussion Community


FluentValidation not working for a null property

c#,wpf,fluentvalidation,idataerrorinfo
I'm using FluentValidation with IDataErrorInfo, and I have a validator defined as follows: public class StsInfoValidator : AbstractValidator<StsInfo> { public StsInfoValidator() { RuleFor(x => x.SomeProperty).Cascade(CascadeMode.StopOnFirstFailure) .NotNull().NotEmpty().WithMessage("SomeProperty is required."); } } However, passing in a null property doesn't seem to trigger the validator: #region IDataErrorInfo public string this[string columnName] { get...

Different ControlTemplates for ErrorTemplate

c#,wpf,binding,controltemplate,idataerrorinfo
In my application I have a ControlTemplate which I use to show that the input of a TextBox is invalid. The ControlTemplate is defined as: <ControlTemplate x:Key="TextBoxErrorTemplate" TargetType="Control"> <Grid ClipToBounds="False"> <Border BorderBrush="Red" BorderThickness="1" Margin="-1"> <AdornedElementPlaceholder Name="adornedElement" /> </Border> <Image HorizontalAlignment="Right" VerticalAlignment="Top" Width="16" Height="16" Margin="0,-9,-8,0"...

Validate a field only if it is populated

c#,wpf,idataerrorinfo
I am having a problem with validating phone numbers. In our system we have two phone numbers which you can store. The problem I am having is that these are optional fields. So I want it to validate the phone number IF and only IF the user has tried to...

How to use Exception Messages for IDataErrorInfo on WPF

c#,wpf,mvvm,idataerrorinfo
i was wondering how to best validate some user inputs on the WPF mvvm pattern? I've implemented IDataErrorInfo in my ViewModel. But I don't know how to use this interface with raising an exception. My purpose is to not have any logic in my viewModel. So the validation has to...

Combobox and IDataErrorInfo

wpf,vb.net,mvvm,combobox,idataerrorinfo
This is my problem. When I select an item from the combobox, (combobox is populated) I have always red outline. Why ? <ComboBox x:Name="Cmb_USER" TabIndex="5" ItemsSource="{Binding User_USER, ValidatesOnExceptions=True, ValidatesOnDataErrors=True,NotifyOnValidationError=True}" IsEditable="True" DisplayMemberPath ="DescUser" Text="{Binding Path=USER}" Margin="114,105,98,179"/> Public Property User_USER As ObservableCollection(Of Model_User) Private p_USER As String Public Property USER() As String...