NServiceBus.Community.Validation/src/NServiceBus.FluentValidation.Tests/Snippets/ContextValidator.cs at main · NServiceBusCommunity/NServiceBus.Community.Validation · GitHub

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// ReSharper disable UnusedVariable

#region FluentValidation_ContextValidator

public class ContextValidator :
    AbstractValidator<TheMessage>
{
    public ContextValidator() =>
        RuleFor(_ => _.Content)
            .Custom((propertyValue, validationContext) =>
            {
                var messageHeaders = validationContext.Headers();
                var bag = validationContext.ContextBag();
                if (propertyValue != "User" ||
                    messageHeaders.ContainsKey("Auth"))
                {
                    return;
                }

                validationContext.AddFailure("Expected Auth header to exist");
            });
}

#endregion