System.IO.Packaging.PackagePart.GetRelationships C# (CSharp) Méthode

        public PackageRelationshipCollection GetRelationships()
        {
            CheckIsRelationship();
            relationshipsCollection.Relationships.Clear();
            relationshipsCollection.Relationships.AddRange(Relationships.Values);
            return relationshipsCollection;
        }

        /// <summary>
        ///By package because  ChangeDocumentType not working well
        /// </summary>
        /// <param name="documentStream"></param>
        private void ChangeDocmToDocxUsingPackage(Stream documentStream)
        {
            // Open the document in the stream and replace the custom XML part
            using (System.IO.Packaging.Package packageFile = System.IO.Packaging.Package.Open(documentStream, FileMode.Open, FileAccess.ReadWrite))
            {
                System.IO.Packaging.PackagePart packagePart = null;
                // Find part containing the correct namespace
                foreach (var part in packageFile.GetParts())
                {
                    if (part.ContentType.Equals("application/vnd.ms-word.document.macroEnabled.main+xml", StringComparison.OrdinalIgnoreCase))
                    {
                        packagePart = part;
                        break;
                    }
                }
                if (packagePart != null)
                {
                    using (MemoryStream source = new MemoryStream())
                    {
                        CopyStream(packagePart.GetStream(), source);

                        var saveRelationBeforeDelPart = new List <PackageRelationship>();
                        foreach (var item in packagePart.GetRelationships())
                        {
                            saveRelationBeforeDelPart.Add(item);
                        }

                        Uri uriData = packagePart.Uri;
                        // Delete the existing XML part
                        if (packageFile.PartExists(uriData))
                        {
                            packageFile.DeletePart(uriData);
                        }

                        // Load the custom XML data
                        var pkgprtData = packageFile.CreatePart(uriData, "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml", System.IO.Packaging.CompressionOption.SuperFast);

                        source.Position = 0;//reset position
                        CopyStream(source, pkgprtData.GetStream(FileMode.Create));

                        foreach (var copyRel in saveRelationBeforeDelPart)
                        {
                            pkgprtData.CreateRelationship(copyRel.TargetUri, copyRel.TargetMode, copyRel.RelationshipType, copyRel.Id);
                        }
                    }
                }
            }
        }