How could we convert a displayed property value before it gets displayed.

Hi everyone,

I’m currently trying to figure out how I could implement an extension in FluentValidation to be able to convert the displayed value of a property. This might seems strange, but in the framework we are using right now, some values are saved in specific units but displayed in another one. Therefore, I would like the validation to display the unit correctly.

As an example, I might have a class with a property Weight that is saved in kg but displayed in lb. When I do validate the property using Fluent Validation, the value that is being validated is in kg (which is good), but the error displayed is in kg (which is bad).

I know that I could have override all the validation to use custom message, but I was trying to find an easier solution. I’ve tried to replace some of the Fluent Validation option, but some classes are not accessible (they are internal). Therefore I’m a little bit stuck.

The other solution would be to validate the converted unit, which would work but requires some changes in the current framework, which I don’t think is a good solution.

Thanks for your help.

[JeremySkinner]

Thanks, I’m glad its working. I’ll close this for now.

For the next release I’ll extend this to make AbstractComparisonValidator.GetComparisonValue public too.

[JeremySkinner]

How’re you defining your rule? It should be populated if the comparison is a constant value. If you’re comparing to another property then MemberToCompare will be populated instead. You could also retrieve it from the MessageFormatter (which I think you were doing before)