Hello

I'm currently trying to prevent deletion and unpublishing of certain pages and media. I've got the following code:

private void ContentService_UnPublishing(IPublishingStrategy sender, PublishEventArgs<IContent> e)
{
    foreach (var item in e.PublishedEntities)
    {
        if (this.IDsNotToBeDeleted.Contains(item.Id.ToString()))
        {
            e.Cancel = true;
            e.Messages.Add(CreateWarningMessage(item.ContentType.Name));
            break;
        }
    }
}

private void ContentService_Trashing(IContentService sender, MoveEventArgs<IContent> e)
{
    foreach (var moveInfoItem in e.MoveInfoCollection)
    {
        if (this.IDsNotToBeDeleted.Contains(moveInfoItem.Entity.Id.ToString()))
        {
            e.Cancel = true;
            e.Messages.Add(CreateWarningMessage(moveInfoItem.Entity.Name));
            break;
        }
    }
}

private static EventMessage CreateWarningMessage(string name)
{
    var eventMessage = new EventMessage("Warning", string.Format("Can not delete {0}", name), EventMessageType.Error);
    return eventMessage;
}

The message appears for the Trashing event (content), but doesn't work for Unpublishing event (content), the Unpublish button just hangs with the spinner spinning, and in the console I get the following error:

Failed to load resource: the server responded with a status of 400 (Bad Request) - http://localhost:888/umbraco/backoffice/UmbracoApi/Content/PostUnPublish?id=1066

With Media Trashing event, I get a similar problem - no message is displayed and an error appears in the console:

POST http://localhost:888/umbraco/backoffice/UmbracoApi/Media/DeleteById?id=1129 400 (Bad Request)

Any information on how to get these working would be great :-)

Cheers!