MARQUER UN DOCUMENT OPENXML EN TANT QUE FINAL

using System;
using System.Collections.Generic;
using System.Text;
using System.IO.Packaging;
using System.IO;
using System.Xml;
using System.Diagnostics;

namespace CS.Utilities 
{
    public static class OpenXMLHelper
    {

        public static void MarkAsFinal(String docxPath)
        {
            MarkAsFinal(docxPath, true);
        }

        public static void MarkAsFinal(String docxPath, Boolean markAsFinal)
        {

            const String K_customPropertiesContentType = "application/vnd.openxmlformats-officedocument.custom-properties+xml";
            const String K_customPropertiesRelationType = @"http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties";


            // chargement du package
            Package package = Package.Open(docxPath);

            // on positionne une propriété du package mais cela ne suffit pas pour que le document soit marqué comme "Final"
            if (markAsFinal)
                package.PackageProperties.ContentStatus = "Final";
            else if (package.PackageProperties.ContentStatus == "Final")
                package.PackageProperties.ContentStatus = String.Empty;

            // On va éditer les Custom Properties du document

            // Récuperation de l'uri de la partie
            Uri uri = new Uri(@"/docProps/custom.xml", UriKind.Relative);


            // obtention ou création de la partie (les custom properties) 
            PackagePart part;
            if (package.PartExists(uri))
            {
                part = package.GetPart(uri);
            }
            else
            {
                part = package.CreatePart(uri, K_customPropertiesContentType);
                XmlDocument basicDoc = new XmlDocument();
                basicDoc.LoadXml(@"<?xml version=""1.0"" encoding=""UTF-8"" standalone=""yes""?>
                                <Properties xmlns=""http://schemas.openxmlformats.org/officeDocument/2006/custom-properties"" xmlns:vt=""http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"">
                                </Properties>");
                StreamWriter sw = new StreamWriter(part.GetStream(FileMode.Create, FileAccess.ReadWrite));
                basicDoc.Save(sw);
                sw.Close();
                sw.Dispose();
            }

            // modification de la partie 
            XmlDocument doc = new XmlDocument();
            doc.Load(part.GetStream());

            XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
            nsmgr.AddNamespace("vt", "http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes");
            nsmgr.AddNamespace("def", "http://schemas.openxmlformats.org/officeDocument/2006/custom-properties");


            // on modifie notre document XML pour qu'il ait ces tags 
            //<property fmtid=""{D5CDD505-2E9C-101B-9397-08002B2CF9AE}"" pid=""2"" name=""_MarkAsFinal"">
            //    <vt:bool>true</vt:bool>
            //</property>

            XmlNode node = doc.SelectSingleNode(@"/def:Properties/def:property[@name=""_MarkAsFinal""]/vt:bool", nsmgr);
            if (node != null)
            {
                node.InnerText = markAsFinal ? "true" : "false";
            }
            else
            {
                node = doc.SelectSingleNode(@"/def:Properties/def:property[@name=""_MarkAsFinal""]", nsmgr);
                if (node != null)
                {
                    XmlNode valueNode = doc.CreateElement("vt:bool", "http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes");
                    valueNode.InnerText = markAsFinal ? "true" : "false";
                    node.AppendChild(valueNode);
                }
                else
                {
                    XmlNode markAsFinalNode = doc.CreateElement("property", "http://schemas.openxmlformats.org/officeDocument/2006/custom-properties");

                    XmlAttribute fmtIDAttribute = doc.CreateAttribute("fmtid");
                    fmtIDAttribute.Value = "{D5CDD505-2E9C-101B-9397-08002B2CF9AE}";
                    markAsFinalNode.Attributes.Append(fmtIDAttribute);

                    // le pid minimum est 2, on regarde le maximum et on lui rajoute 1 
                    XmlNodeList pidNodes = doc.SelectNodes(@"/def:Properties/def:property/@pid", nsmgr);
                    int pid = 1;
                    foreach (XmlNode pidNode in pidNodes)
                    {
                        if (int.Parse(pidNode.Value) > pid)
                            pid = int.Parse(pidNode.Value);
                    }

                    pid += 1;

                    XmlAttribute pidAttribute = doc.CreateAttribute("pid");
                    pidAttribute.Value = pid.ToString();
                    markAsFinalNode.Attributes.Append(pidAttribute);

                    XmlAttribute nameAttribute = doc.CreateAttribute("name");
                    nameAttribute.Value = "_MarkAsFinal";
                    markAsFinalNode.Attributes.Append(nameAttribute);

                    XmlNode valueNode = doc.CreateElement("vt:bool", "http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes");
                    valueNode.InnerText = markAsFinal ? "true" : "false";
                    markAsFinalNode.AppendChild(valueNode);

                    doc.DocumentElement.AppendChild(markAsFinalNode);
                }

                package.CreateRelationship(uri, TargetMode.Internal, K_customPropertiesRelationType);
            }

            // enregistrement du document 
            doc.Save(part.GetStream());

            package.Flush();
            package.Close();
        }
   }
}