I have implemented validation as per the TempHire reference application, and note that DataAnnotations may also be used on individual properties (I am using code first approach).

 

I am using DevExpress controls that apparantly do not support dataannotations but rather the IDataErrorInfo approach. I have added the IDataErrorInfo interface to my class and have placed the correct validation code in the 'string IDataErrorInfo.this[string columnName]' method. Yet still the control does not show an error. I suspect it is an MVVM thing or the fact I seem to be mixing two types of validation.

 

Anyone have any pointers?

 

Thanks

Mark

I have changed the control to a TextBox thus simplifying the issue by using standard out of the box controls. I would expect a red outline to be displayed. I should note that I am using WPF.

I have read: http://drc.ideablade.com/devforce-2012/bin/view/Documentation/cocktail-validation - http://drc.ideablade.com/devforce-2012/bin/view/Documentation/cocktail-validation

and http://drc.ideablade.com/devforce-2012/bin/view/Documentation/verification-ui - http://drc.ideablade.com/devforce-2012/bin/view/Documentation/verification-ui

(this one seems to hint at more code required for WPF to get this to work)

and the code sample at: http://drc.ideablade.com/devforce-2012/bin/view/Documentation/code-sample-validation-wpf - http://drc.ideablade.com/devforce-2012/bin/view/Documentation/code-sample-validation-wpf

My binding appears correct:

<TextBox Text="{Binding ReportedBy, Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=true}"/>

In the model I have tried:

and even added:

If I attempt save the record it will display a validation error dialog listing the fields in question that are at fault, but still no difference to the TextBox

I have also added the custom style as recommended in the sample:

<Style TargetType="{x:Type TextBox}">
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<DockPanel>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
<AdornedElementPlaceholder/>
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
<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>
<Setter Property="Validation.ErrorTemplate">
<Setter.Value>
<ControlTemplate>
<DockPanel>
<TextBlock Foreground="Red" FontSize="20">!</TextBlock>
<AdornedElementPlaceholder/>
</DockPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
<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>