NuGet.PackageReferenceFile.SaveDocument C# (CSharp) Method

        private void SaveDocument(XDocument document)
        {
            // Sort the elements by package id and only take valid entries (one with both id and version)
            var packageElements = (from e in document.Root.Elements("package")
                                   let id = e.GetOptionalAttributeValue("id")
                                   let version = e.GetOptionalAttributeValue("version")
                                   where !String.IsNullOrEmpty(id) && !String.IsNullOrEmpty(version)
                                   orderby id
                                   select e).ToList();

            // Remove all elements
            document.Root.RemoveAll();

            // Re-add them sorted
            document.Root.Add(packageElements);

            FileSystem.AddFile(_path, document.Save);
        }