Vibrant discussion about CSLA .NET and using the framework to build great business applications.
Hello,
I've a Custom Rules that checks if the user entered a valid numerical value (Double.TryParse)
I override the AddBusinessRules Method and added the rule like this:
BusinessRules.AddRule(new Business.CustomRules.Numerical(PreislistePos.PreisNormalProperty));
It works fine, as long as the user enters a numeric value. If the user types in characters, the rule doesn't checks the entered value. And the Property Status will not be shown.
Property:
public static readonly PropertyInfo<decimal> PreisNormalProperty = RegisterProperty<decimal>(c => c.PreisNormal); [Display(ResourceType = typeof(Asego), Name = "PreisNormalText")] public decimal PreisNormal { get { return GetProperty(PreisNormalProperty); } set { SetProperty(PreisNormalProperty, value); } }
XAML:
<TextBox Grid.Column="2" Height="23" Name="preisNettoTextBox" Text="{Binding Path=CurrentSelectedPreislistePos.PreisNetto, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true}" VerticalAlignment="Center" Margin="10,4,30,5" BorderBrush="{Binding Path=IsValid, ElementName=preisNettoStatus, Converter={StaticResource validbrushConverter}}" />
<csla:PropertyStatus x:Name="preisNettoStatus" Property="{Binding Path=PreisNetto, Mode=TwoWay}" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0,0,10,0" IsManipulationEnabled="True" DataContext="{Binding Path=CurrentSelectedPreislistePos}" />
Now my question is, how to "fire" the rule if a user enter a character value in the TextBox?
Thanks and kind regards
Kevin
Hi,
The default value converter is unable to transform the text input from user to a decimal value and so the value is never set in the BO numeric property.
You could create your own value converter and set a "non valid" numerical value in the BO if the input text can not be parsed to a decimal.
In short -
A: your BO property is decimal - and you must use a custom value converter to convert a not valid text to a numeric value
B: You could change the BO value to a string and add extra logic in Rules/DAL to convert to/from string-numeric value.
Good info on ValueConverter can be found here: http://www.wpftutorial.net/ValueConverters.html
Jonny Bekkum, Norway CslaContrib Coordinator
Thank you Jonny for your fast replay :-)
This will work for me, I think I use the "Converter-Option".