FluentValidation - 仅当值不是 null 时，检查值才是表达式

Question

I am trying to Validate that a Cron Expression is valid only when the property is not null

My code looks like this,

 RuleFor(team => team.PlayTimeSlot)
                .Must(IsValidSchedule)
                .When(team => !string.IsNullOrEmpty(team.PlayTimeSlot));

 public bool IsValidSchedule(string schedule)
        {
        // Some Schedule validation logic
        }

However this does not work. What am I missing?

Answer 1

I would try to separate everything into methods as an alternative like this:

RuleFor(team => team.PlayTimeSlot)
        .When(playTimeValid)
        .Must(IsValidSchedule);

public bool isValidSchedule()
{
    return true
}
public bool playTimeValid(TeamModel team)
{
    if !string.isnullorempty(team.playtimeslot)
    return true
}

Can you Try that with your code?