Hey

I'm trying to make a check that looks at a page when it's published to check if a given UmbracoUrlAlias already exisits.

But when I check the value on the published node, the value is null...

My function:

private void ContentService_Publishing(IContentService sender, ContentPublishingEventArgs e)
    {
        foreach (var node in e.PublishedEntities)
        {
            using (UmbracoContextReference contextReference = _umbracoContext.EnsureUmbracoContext())
            {
                UmbracoContext context = contextReference.UmbracoContext;
                IPublishedContent content = context.Content.GetById(node.Id);
                var altUrl = node.GetValue<string>("umbracoUrlAlias");
                if (!string.IsNullOrEmpty(altUrl) & altUrl != null)
                {
                    var roots = context.Content.GetAtRoot();
                    foreach (var root in roots)
                    {
                        var UrlAliasExists = root.DescendantsOrSelf().Where(x => x.Id != node.Id && altUrl.ToString() == x.Value<string>("umbracoUrlAlias")).ToList();

                        //var UrlAliasExists = root.Descendants().Where(x => x.Id != node.Id && altUrl.ToString() == x.Value<string>("umbracoUrlAlias")).ToList();
                        if (UrlAliasExists.Any())
                        {
                            e.Cancel = true;
                            e.Messages.Add(new Umbraco.Core.Events.EventMessage("fejl i url alias", string.Format("alias [{0}] der er valgt bruges allerede", node.GetValue("umbracourlalias")), Umbraco.Core.Events.EventMessageType.Error));

                        }
                    }
                }
            }
        }
    }

My variable "altUrl" are always null... ?

Have tried: - node.GetValue

Anyone that can see what i'm doing wrong ?

Version: Umbraco 8.6.3