鉴于以下情况WE
\documentclass[12pt]{article}
\usepackage{unicode-math}
\usepackage{mathtools}
\usepackage[most]{tcolorbox}
\newtcolorbox{mybox}{
sharp corners
}
\newcounter{mycounter}
\setcounter{mycounter}{0}
\newcommand{\myentry}[1]{%
\addcontentsline{toc}{subsection}{%
\textbf{\thesection.\themycounter}~\texorpdfstring{\boldmath #1}{a}%
}%
}
\newcommand{\mysample}[1]{\begin{mybox}
\textbf{Sample \themycounter:} \begin{equation*}
#1
\end{equation*}
\end{mybox}}
\usepackage{hyperref}
\begin{document}
\tableofcontents
\section{Samples}
\myentry{$\symbf{a+b=c}$}
\mysample{a+b = c}
\myentry{$\symbf{x+y =z}$}
\mysample{x + y = z}
\end{document}
我打算mycounter在读完计数器后增加。但当我这样做时
\newcommand{\myentry}[1]{%
\addcontentsline{toc}{subsection}{%
\textbf{\thesection.\refstepcounter{mycounter}\themycounter}~\texorpdfstring{\boldmath #1}{a}%
}%
}
\protect并在每次调用之前添加一个\myentry{...}，我收到以下错误
Missing \endcsname inserted. \protect\myentry{$\symbf{a+b = c}$}
我怎样才能解决这个问题？