Question

I am trying to validate user input in WPF with Entlib 5.0. I want to check if value in textbox is a number.

My model:

public class Customer
{
    [Required(ErrorMessage = "Country is required")]
    public double Country { get; set; }
}

Xaml:

<TextBox>
    <TextBox.Text>
         <Binding Path="Country" UpdateSourceTrigger="PropertyChanged"  >
               <Binding.ValidationRules>
                  <vab:ValidatorRule ValidationSpecificationSource="All" SourceType="{x:Type bl:Customer}" SourcePropertyName="Country"/>
                </Binding.ValidationRules>
         </Binding>
    </TextBox.Text>
 </TextBox>

When I am setting the text to texbox Validation.HasError is set to false.

Any ideas how I can validate this situation.

Answer 1

I’ve found the solution.

Binding should looks like this:

<Binding Path="Country" UpdateSourceTrigger="PropertyChanged" NotifyOnValidationError="True" ValidatesOnExceptions="True">
   <Binding.ValidationRules>
       <vab:ValidatorRule ValidationSpecificationSource="All" SourceType="{x:Type bl:Customer}" SourcePropertyName="Country"/>
    </Binding.ValidationRules>
</Binding>