Nome da peça entre 2 hl no toc

Question

Como adicionar 2 linhas a todos os nomes de peças no toc como nesta imagem.

\documentclass[a4paper,11pt,openany,french]{book}
\usepackage[french]{babel}
\usepackage{geometry}
\geometry{paperwidth=21cm,paperheight=29.7cm, body={18cm,25.7cm}, top=2.5cm, left=1.5cm}
\usepackage[pdftex,pdfauthor={Moi},pdftitle={Bonjour},pdfpagemode={UseOutlines},bookmarks,bookmarksopen,bookmarksnumbered,pdfstartview={FitH},colorlinks,linkcolor={blue},citecolor={blue},urlcolor={red}]{hyperref}

\begin{document}
{

\frontmatter
\tableofcontents
\cleardoublepage

\chapter*{Preface}

\mainmatter

\part{kafhkahj}
\chapter{lafhjlahf}
\chapter{lafhsfsffasf}
\chapter{l54gfvsahf}

\part{pokjk}
\chapter{32546}

}
\end{document}

Answer 1

Aqui está uma solução simples com titletoc:

\documentclass[a4paper,11pt,openany,french]{book}
\usepackage{babel}
\usepackage{geometry}
\geometry{body={18cm,25.7cm}, top=2.5cm, left=1.5cm}
\usepackage{mfirstuc, titlecaps}
\newcommand{\Partname}{Partie}%
    \usepackage{titletoc}
     \titlecontents{part}[0pt]{\bfseries\protect\addvspace{15pt}\titlerule[1pt]\addvspace{1ex}}%
    {}{\Partname~}%numbered, unnumbered
     {\hfill\contentspage}[\addvspace{0.7ex}{\titlerule[1pt]}\addvspace{1.5ex}]
\usepackage[pdftex]{hyperref}

\begin{document}
{

\frontmatter
\tableofcontents
\cleardoublepage

\chapter*{Préface}

\part{kafhkahj}
\chapter{lafhjlahf}
\chapter{lafhsfsffasf}
\chapter{l54gfvsahf}

\part{pokjk}
\chapter{32546}

}
\end{document}