How to call a method after fluent validation faliure

Question

I want to run a method if a fluent validation method fails.

RuleFor(x => x.SheepName)
            .Must(x => x.SheepName == null)
            .When(x => x.HasSheep == false)
            .Otherwise(callMethod());

So in this case, if the HasSheep value is false but the SheepName is still given, then I want to run a method (in the example the method is called 'callMethod()').

I have made up the .Otherwise statement, so looking for what this whole line '.Otherwise(callMethod());' needs to be..

Answer 1

Current version:

OnFailure (and OnAnyFailure) were removed in V11. From the release notes:

If you were previously using OnFailure or OnAnyFailure to perform custom logic after validation, we recommend using a Custom validator instead.

Older versions:

You can use OnFailure(…), as documented here

You can make use of the OnAnyFailure and OnFailure (as of 8.0) callbacks to run a method if validation fails.

RuleFor(x => x.SheepName)
       .Must(x => x.SheepName == null)
       .When(x => x.HasSheep == false)
       .OnFailure(x => callMethod());