xml - how to change the sequence of nodes.

[PerplexedB]

The following (see the full code below) successfully adds a page in a section in Onenote. What I don't seem to be able to do is to get the lastly created page on top of the section. Here's the code that is puzzling me.

 onenoteApp.GetHierarchy(sectionId, OneNote.HierarchyScope.hsPages, out string xmlPages);
 var docPages = XDocument.Parse(xmlPages);
 var lastNode = docPages.LastNode;
 lastNode.Remove();
 docPages.AddFirst(lastNode);

GetHIerachy() just loads xml into xmlPages.

The problem is stricly XML, I don't think OneNote is a problem (at this stage), as docPage.document (the xml string) is in the same state at the end as when docPages was Parsed.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
using OneNote = Microsoft.Office.Interop.OneNote;

namespace CreateOneNotePage
{
    class Program
    {
        static OneNote.Application onenoteApp = new OneNote.Application();
        static XNamespace ns = null;
        static void Main(string[] args)
        {
            onenoteApp.GetHierarchy(null, OneNote.HierarchyScope.hsNotebooks, out string xml);
            GetNamespace();
            string notebookId = GetObjectId(null, OneNote.HierarchyScope.hsNotebooks, "CreateOnenotePage");
            string sectionId = GetObjectId(notebookId, OneNote.HierarchyScope.hsSections, "Projects");
            string pageId = CreatePage(sectionId, "TEst" + DateTime.Now.ToString("hhmmss"));
            Console.WriteLine(pageId);
            Console.ReadKey();
        }

        private static void GetNamespace()
        {
            string xml;

            onenoteApp.GetHierarchy(null, OneNote.HierarchyScope.hsNotebooks, out xml);
            var doc = XDocument.Parse(xml);
            ns = doc.Root.Name.Namespace;
        }
        static string GetObjectId(string parentId, OneNote.HierarchyScope scope, string objectName)
        {
            string xml;
            onenoteApp.GetHierarchy(parentId, scope, out xml);

            var doc = XDocument.Parse(xml);
            var nodeName = "";

            switch (scope)
            {
                case (OneNote.HierarchyScope.hsNotebooks): nodeName = "Notebook"; break;
                case (OneNote.HierarchyScope.hsPages): nodeName = "Page"; break;
                case (OneNote.HierarchyScope.hsSections): nodeName = "Section"; break;
                default:
                    return null;
            }

            var node = doc.Descendants(ns + nodeName).Where(n => n.Attribute("name").Value == objectName).FirstOrDefault();

            return node.Attribute("ID").Value;
        }
        static string CreatePage(string sectionId,string pageName)
        {
            onenoteApp.CreateNewPage(sectionId, out string pageId);
            onenoteApp.GetPageContent(pageId, out string xml, OneNote.PageInfo.piAll);
            var doc = XDocument.Parse(xml);
            var title = doc.Descendants(ns + "T").First();
            title.Value = pageName;
            onenoteApp.UpdatePageContent(doc.ToString());
            onenoteApp.GetHierarchy(sectionId, OneNote.HierarchyScope.hsPages, out string xmlPages);
            var docPages = XDocument.Parse(xmlPages);
            var lastNode = docPages.LastNode;
            lastNode.Remove();
            docPages.AddFirst(lastNode);
            onenoteApp.UpdateHierarchy(docPages.ToString());
            return pageId;
        }
    }
}

[rproffitt]

I worry about deleting a thing before I move a thing. Since your oject lastNode is removed in line 4, I worry what line 5 would do.
Also check out the answer at https://stackoverflow.com/questions/2437158/whats-the-best-way-to-move-a-child-up-in-a-net-xmldocument where an insert method is used and remove is not used at all.

[PerplexedB]

Thank you very much. My problem inow s that docPages is a XNode and not an XmlNode. Only the latter seems to have a InserBefore method.

Would you have an idea how I should change my code so that I get XmlNodes?

[rproffitt]

Just a thought. Microsoft has their API all over the map but looking at https://msdn.microsoft.com/en-us/library/system.xml.linq.xnode_methods(v=vs.110).aspx

I see the XNode.AddBeforeSelf Method (Object) method which looks interesting. That is, since no insert, maybe this to the first object?

[PerplexedB]

You were right. It works now. Well OneNote does not seem not very happy, but that's another problem.
Many thanks for your help.

       static string CreatePage(string sectionId,string pageName)
        {
            onenoteApp.CreateNewPage(sectionId, out string pageId);
            onenoteApp.GetPageContent(pageId, out string xml, OneNote.PageInfo.piAll);
            var doc = XDocument.Parse(xml);
            var title = doc.Descendants(ns + "T").First();
            title.Value = pageName;
            onenoteApp.UpdatePageContent(doc.ToString());
            onenoteApp.GetHierarchy(sectionId, hsScope: OneNote.HierarchyScope.hsPages, pbstrHierarchyXmlOut: out string xmlPages);
            var xDoc = XDocument.Parse(xmlPages);
            var xPages = xDoc.Descendants(ns + "Page");
            XElement xFirstPage = xPages.FirstOrDefault();
            XElement xLastPage = xPages.Where(x => x.Attribute("ID").Value == pageId).FirstOrDefault();
            xFirstPage.AddBeforeSelf(xLastPage);
            xLastPage.Remove();
            onenoteApp.UpdateHierarchy(xDoc.ToString());
            return pageId;
        }
    }