System.UriExtensions.AddFragment C# (CSharp) Méthode

        public static Uri AddFragment(this Uri uri, string fragment)
        {
            if (uri == null)
            {
                throw new ArgumentNullException("uri");
            }

            if (uri.Scheme == "urn")
            {
                return AddName(uri, fragment);
            }

            if (fragment != null)
            {
                var iri = new StringBuilder(uri.ToString());
                if (uri.Fragment.Length > 0)
                {
                    int hash = iri.ToString().LastIndexOf('#');
                    iri.Remove(hash, 1);
                    if (iri[hash - 1] != '/')
                    {
                        iri.Insert(hash, '/');
                    }
                }
                else if ((iri[iri.Length - 1] != '/') && (uri.Query.Length == 0))
                {
                    iri.Append('/');
                }

                iri.Append("#");
                iri.Append(fragment);
                return new Uri(iri.ToString());
            }

            return uri;
        }