IValidatableObject.Validate does not fire if DataAnnoations add ValidationResult - asp.net-mvc

Question

With a standard ASP.NET MVC controller and view and a model that both implements IValidatableObject and has DataAnnotations, the Validate method never fires if the DataAnnotations generate an exception.
Here's the model...
public class ModelStaticDA : IValidatableObject {
public long Id { get; set; }
[EmailAddress]
public string EmailAddress { get; set; }
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) {
yield return new ValidationResult("MODEL NOT VALID!")
}
}
Here's the view (client validation is disabled for this demo)...
#model BindingAndValidation.Models.ModelStaticDA
#{
ViewBag.Title = "Create";
HtmlHelper.ClientValidationEnabled = false;
}
<h2>Create</h2>
#using (Html.BeginForm())
{
#Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>ModelStaticDA</h4>
<hr />
#Html.ValidationSummary(true)
<div class="form-group">
#Html.LabelFor(model => model.EmailAddress, new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.TextBoxFor(model => model.EmailAddress)
#Html.ValidationMessageFor(model => model.EmailAddress)
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
If you post something like "invalid" to EmailAddress, only the DataAnnotation message displays. If you post a valid e-mail address, the message from Validate displays.
Is this the correct behavior? If so, why? If not, what am I doing wrong?

Answer 1

You are doing everything right, that's the behavior. My guess it was designed this way to avoid having to validate again while working with the properties inside the Validate method, you know that when it's called you are working with valid data, and you can do things that require valid data.