\documentclass{article}
\usepackage{arydshln}
\usepackage{bidi}
\title{Testing \textsf{arydshln} Package in LTR and RTL modes}
\author{}
\date{}
\begin{document}
\maketitle
\section{LTR Mode}
\begin{center}
\begin{tabular}{|l::c;{2pt/2pt}r|}\hline
A&B&C\\\hdashline[1pt/1pt]
AAA&BBB&CCC\\\cdashline{1-2}[.4pt/1pt]
\multicolumn{2}{|l;{2pt/2pt}}{AB}&C\\\hdashline\hdashline
\end{tabular}
\end{center}
\section{RTL Mode}
\begin{RTL}
\begin{center}
\begin{tabular}{|r::c;{2pt/2pt}l|}\hline
A&B&C\\\hdashline[1pt/1pt]
AAA&BBB&CCC\\\cdashline{1-2}[.4pt/1pt]
\multicolumn{2}{|r;{2pt/2pt}}{AB}&C\\\hdashline\hdashline
\end{tabular}
\end{center}
\end{RTL}
\end{document}