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copied!<p>Okay, I found a better solution that lets me use my previous library architecture. </p> <p>I was able to keep the UserMetadata class in a separate library from UserEntity. Here is what the dependency graph looks like:</p> <p>UserMetadata [depends on] DuplicateUserValidationAttribute [depends on] IDuplicateUserValidator</p> <p>The actual DuplicateUserValidator implementation class is in my service layer, and looks something like this:</p> <pre><code>public class DuplicateUserValidator : Validator<string>, IDuplicateUserValidator { public DuplicateUserValidator() : base(null, null) { } [Dependency] public IRepository<UserEntity> UserRepository { get; set; } protected override string DefaultMessageTemplate { get { throw new NotImplementedException(); } } protected override void DoValidate(string stringToValidate, object currentTarget, string key, ValidationResults validationResults) { if (this.UserRepository == null) throw new InvalidOperationException("This should not happen"); // actual code to perform validation... } } </code></pre> <p>The trick is getting the DuplicateUserValidatorAttribute to not depend on DuplicateUserValidator:</p> <pre><code>public class DuplicateUserValidatorAttribute : ValidatorAttribute { protected override Validator DoCreateValidator(Type targetType) { var validator = Unity.Container.Resolve<IDuplicateUserValidator>() as Validator; validator.Tag = Tag; validator.MessageTemplate = GetMessageTemplate(); return validator; } } </code></pre> <p>All I needed to do from there was add a mapping to the unity config. When the singleton resolves the IDuplicateUserValidator, it injects my implementation class from the service layer, honoring the [Dependency] attribute on the UserRepository property.</p>

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