TikZ \foreach 循环与 \csname 宏列表

Question

我在 TikZ foreach 循环中遇到了宏定义列表的问题。宏由\csname...构建\endcsname。我尝试过使用多个\expandafter或 ##1 代替 #1，但没有成功：元素列表不被视为多个元素，而被视为完整的字符串。

这是我的 MWE：

\documentclass[border=10pt]{standalone}

\usepackage{tikz}

% Macro to read in configuration parameters
\newcommand*\ReadCfg[3]{%
    \expandafter\xdef\csname#1#2list\endcsname{#3}%
}

% Provide list for upper positions (this macro will be looped by \foreach)
% \jobname is 'AUT'
\providecommand\ListUpper{%
    \expandafter\csname\jobname upperlist\endcsname%
}

% This configuration will be later provided by external file
\ReadCfg{AUT}{upper}{Elem1,Elem2,Elem3}

\begin{document}
\begin{tikzpicture}
    \foreach \e in \ListUpper {
        \typeout{***\space\e} % \e is interpreted as "Elem1,Elem2,Elem3" instead of single elements
   }
\end{tikzpicture}
\end{document}

那么，我如何循环遍历元素列表？

谢谢你！

Answer 1

\documentclass[border=10pt]{standalone}

\usepackage{tikz}

% Macro to read in configuration parameters
\newcommand*\ReadCfg[3]{%
    \expandafter\xdef\csname#1#2list\endcsname{#3}%
}

% Provide list for upper positions (this macro will be looped by \foreach)
% \jobname is 'AUT'
\providecommand\ListUpper{%
  \csname\jobname upperlist\endcsname%
}

% This configuration will be later provided by external file
\ReadCfg{AUT}{upper}{Elem1,Elem2,Elem3}

\begin{document}
\begin{tikzpicture}
  \edef\tmpA{\ListUpper}
  \foreach \e in \tmpA {
        \typeout{***\space\e} % \e is interpreted as "Elem1,Elem2,Elem3" instead of single elements
   }
\end{tikzpicture}

\end{document}

来自AUT.log：