/// <summary>
/// Adds an <see cref="ContentPropertyValidationResult"/> error to model state for a property so we can use it on the client side.
/// </summary>
/// <param name="modelState"></param>
/// <param name="result"></param>
/// <param name="propertyAlias"></param>
/// <param name="culture">The culture for the property, if the property is invariant than this is empty</param>
internal static void AddPropertyError(this System.Web.Http.ModelBinding.ModelStateDictionary modelState,
ValidationResult result, string propertyAlias, string culture = "", string segment = "")
{
modelState.AddPropertyValidationError(new ContentPropertyValidationResult(result, culture, segment), propertyAlias, culture, segment);
}