Thanks. Appreciate the quick feedback.
When I get a chance I will download the source and do a build. Based on what I saw, the NuGet package install just references the libraries for the project. I take it I need to do that manually once I build the source and copy the libraries?
I will also take a second look at the way I have defined the rule against the object to be more in line with your recommendation.
From: JeremyS [email removed]
Sent: Thursday, November 08, 2012 4:08 AM
To: Patrick Woodall
Subject: Re: NullReferenceException using FluentValidation in MVC3 [FluentValidation:400368]
From: JeremyS
Got it - thanks.
Looking at this, it appears the issue was fixed last month in a patch, however I haven't yet got round to doing a new deployment since then. If you download and build from source, then the error should go away.
As expected, the problem was caused by using RuleFor(t => t). Doing this is not supported (with FluentValidation, rules should be defined against properties, not against the object itself). However, although this isn't supported it shouldn't cause a crash. Someone noticed this issue last month and kindly provided a patch for it.
With the TestIsDefined rule, I'd recommend associating it with one of the properties, eg TestID:
public TestValidator()
{RuleFor(t => t.TestID).Must(TestIsDefined).WithMessage("User must select existing customer or provide at least a new customer name");
}privatebool TestIsDefined(TestModel model, int? testId)
{return (TestID.HasValue || (string.IsNullOrWhiteSpace(model.TestName) &&string.IsNullOrWhiteSpace(model.TestDescription)));
}However, if you really want to use RuleFor(t=>t) then you'll need to call .OverridePropertyName as part of the rule (as FV won't be able to automatically determine which property to associate the rule with).
Jeremy
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