/// <summary>
/// Adds the error to model state correctly for a property so we can use it on the client side.
/// </summary>
/// <param name="modelState"></param>
/// <param name="result"></param>
/// <param name="parts">
/// Each model state validation error has a name and in most cases this name is made up of parts which are delimited by a '.'
/// </param>
internal static void AddValidationError(this System.Web.Http.ModelBinding.ModelStateDictionary modelState,
ValidationResult result, params string[] parts)
{
// if there are assigned member names, we combine the member name with the owner name
// so that we can try to match it up to a real field. otherwise, we assume that the
// validation message is for the overall owner.
// Owner = the component being validated, like a content property but could be just an HTML field on another editor
var withNames = false;
var delimitedParts = string.Join(".", parts);
foreach (var memberName in result.MemberNames)
{
modelState.TryAddModelError($"{delimitedParts}.{memberName}", result.ToString());
withNames = true;
}
if (!withNames)
{
modelState.TryAddModelError($"{delimitedParts}", result.ToString());
}
}