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    <p>I'm not too sure you'll be able to pass runtime parameters into your attribute.</p> <p>You could use <code>DependencyResolver.Current.GetService&lt;DataAccessHelper&gt;()</code> to resolve your dal (given that you've registered DataAccessHelper)</p> <p>You're probably more likely to have registered DataAccessHelper as IDataAccessHelper or something? in which case you'd call <code>GetService&lt;IDataAccessHelper&gt;</code></p> <pre><code>public class EmailIsUnique : ValidationAttribute { private string _errorMessage = "An account with this {0} already exists"; protected override ValidationResult IsValid(object value, ValidationContext validationContext) { IDataAccessHelper Dal = DependencyResolver.Current.GetService&lt;IDataAccessHelper&gt;(); // too slow bool isValid = true; if(value == null) { isValid = false; _errorMessage = "{0} Cannot be empty"; } else { string email = value.ToString(); if (Dal.User.FindByEmail(email) != null) { isValid = false; } } if (isValid) return ValidationResult.Success; else return new ValidationResult(String.Format(_errorMessage, validationContext.DisplayName)); } } </code></pre> <p>or</p> <pre><code>public class EmailIsUnique : ValidationAttribute { [Dependency] public IDataAccessHelper DataAccess {get;set;} private string _errorMessage = "An account with this {0} already exists"; protected override ValidationResult IsValid(object value, ValidationContext validationContext) { bool isValid = true; if(value == null) { isValid = false; _errorMessage = "{0} Cannot be empty"; } else { string email = value.ToString(); if (DataAccess.User.FindByEmail(email) != null) { isValid = false; } } if (isValid) return ValidationResult.Success; else return new ValidationResult(String.Format(_errorMessage, validationContext.DisplayName)); } } </code></pre>
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    1. POHow to pass parameters into a ValidationAttribute?
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    1. USVaibhav Parmar
    1. USJamez
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    1. COSorry I guess my code is a bit confusing. I need to get rid of the service locator pattern here, because it's in a separated project, which should only receive dependencies. Looks like I might have to move this from an attribute to some custom code. Thanks James, appreciate it!
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    2. COIf that's the case, you could consider abstracting your DAL with an interface, registering that interface with your IoC container and using property injection by specifying [Dependency] above the IDataAccesHelper property on your attribute?
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    3. COYes! I just concocted the very same strategy in my head, whilst taking a walk outside, (the first part anyway!). Re the 2nd part that's awesome I didn't know that about Unity, thank you!
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