I am trying to create a notification email that will show the difference between the saved and previously published version.

My plan was to create a AfterSendToPublish event and use the umbraco.cms.businesslogic.utilities.Diff.Diff2Html() method to create the body text. Pretty much exactly the same way the rollback feature works (that is where I got most of the code from).

Can somebody explain how and where documents are “saved” vs “Published”? Maybe I'm comparing the worng versions?

void Document_AfterSendToPublish(Document sender, umbraco.cms.businesslogic.SendToPublishEventArgs e)
    {
        Document currentDoc = sender;
        DocumentVersionList[] versions = currentDoc.GetVersions().OrderByDescending(v => v.Date).ToArray();
        
        Document rollback = new Document(currentDoc.Id, versions[1].Version);
        var props = sender.GenericProperties;

        StringBuilder propertiesCompare = new StringBuilder();

        foreach (Property p in props)
        {
            try
            {
                if (p.Value != null)
                {
                    string thevalue = p.Value.ToString();

                    thevalue = umbraco.library.StripHtml(p.Value.ToString());
                    Property cP = currentDoc.getProperty(p.PropertyType);
                    if (cP != null && cP.Value != null)
                    {
                        string cThevalue = umbraco.library.StripHtml(cP.Value.ToString());

                        propertiesCompare.Append(p.PropertyType.Name + " - " + umbraco.library.ReplaceLineBreaks(umbraco.cms.businesslogic.utilities.Diff.Diff2Html(cThevalue, thevalue)) + "<br />");
                    }
                    else
                    {
                        propertiesCompare.Append(p.PropertyType.Name + " - " + thevalue + "<br />");
                    }
                }
            }
            catch { }
        }

        umbraco.library.SendMail("", "", "Sent To Publish", propertiesCompare.ToString(), true);
    }

Maybe I’m going about this all wrong, if anybody has any better ideas let me know