Longtable 和 rowcolor 问题

Question

以下是我正在处理mwe的标题中多余空白的问题。如果我没记错的话，longtable这主要是由于。@{\extracolsep{\fill}}

\documentclass[letterpaper]{article}
\usepackage[letterpaper,tmargin=2cm,bmargin=2.5cm,lmargin=2.5cm,rmargin=2.5cm]{geometry}
\usepackage{booktabs,array,longtable}
\usepackage[dvipsnames,table]{xcolor}
\usepackage{enumitem}
\begin{document}
\renewcommand{\labelenumi}{\bfseries Unit\ \arabic{enumi}.}
\renewcommand{\arraystretch}{1.5}
\setlength\LTleft{0pt}%
\setlength\LTright{0pt}%
\begin{longtable}{@{\extracolsep{\fill}}|c|>{\centering\arraybackslash}p{8.5em}|>{\raggedright\arraybackslash}p{.5\textwidth}|p{6.5em}|@{}}
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endfirsthead
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endhead
    %\hline
    %--------------------------------------------- Week 1-3 ---------------------------------------------
    text 
    & 
    text
    &
    text
    & 
    text\tabularnewline
    \hline%
\end{longtable}
\end{document}

关于如何删除空白处或至少是什么导致空白处的任何建议？

Answer 1

看看以下解决方案是否适合您：

\documentclass[letterpaper]{article}
\usepackage[showframe, % only for see if table width fit text width               
           letterpaper,
           tmargin=2cm,bmargin=2.5cm,lmargin=2.5cm,rmargin=2.5cm]{geometry}
\usepackage{array, booktabs, longtable}
\usepackage[dvipsnames,table]{xcolor}
\usepackage{enumitem}

\begin{document}
\renewcommand{\labelenumi}{\bfseries Unit\ \arabic{enumi}.}
\renewcommand{\arraystretch}{1.5}
\begin{longtable}{|>{\centering}p{\dimexpr0.1\linewidth-2\tabcolsep-1.25\arrayrulewidth\relax}
                  |>{\centering}p{\dimexpr0.2\linewidth-2\tabcolsep-1.25\arrayrulewidth\relax}
                  |>{\raggedright}p{\dimexpr.5\textwidth-2\tabcolsep-1.25\arrayrulewidth\relax}
                  | p{\dimexpr0.2\linewidth-2\tabcolsep-1.25\arrayrulewidth\relax}|}
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endfirsthead
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endhead
    text
    &
    text
    &
    text
    &
    text\tabularnewline
    \hline%
\end{longtable}
\end{document}

我没有费心重新计算列的宽度，但这不应该是什么大问题:)

Answer 2

为了实现一个\textwidth宽度恰好为 的 longtable，我建议您加载，这样就可以将ltablex的功能带给。我冒昧地简化了您的序言，特别是您不必加载，因为它也不会为您做任何事情：longtabletabularxarraylongtabletabularxltablex

\documentclass[letterpaper]{article}
\usepackage[tmargin=2cm,bmargin=2.5cm, hmargin=2.5cm, showframe]{geometry}
\usepackage{booktabs,ltablex}
\usepackage[dvipsnames,table]{xcolor}
\usepackage{enumitem}

\begin{document}

\renewcommand{\labelenumi}{\bfseries Unit\ \arabic{enumi}.}
\renewcommand{\arraystretch}{1.5}
\keepXColumns
\begin{tabularx}{\linewidth}{|c|>{\centering\arraybackslash}p{8.5em}|>{\raggedright\arraybackslash}X|p{6.5em}|@{}}
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endfirsthead
    \hline
        \rowcolor{gray!10}\textbf{text} & \textbf{text} & \textbf{text} & \textbf{text}\tabularnewline%
    \hline
    \endhead
    %\hline
    %--------------------------------------------- Week 1-3 ---------------------------------------------
    text
    &
    text
    &
    text
    &
    text \\
    \hline%
\end{tabularx}

\end{document}