scrlayer-scrpage

Question 1

下面我删除了所有不相关的内容。

您可以为第一页定义一个页面样式附加项并将其与一起使用\thispagestyle。其余页面将使用默认页面样式。

\documentclass[%
 paper=a4,       
 fontsize=10pt,  
 ngerman         
 ]{scrartcl}

\usepackage[]{graphicx}
\usepackage{xcolor}

\usepackage{scrlayer-scrpage}

% not doing this will keep the page numbers etc. on the second page
%\clearscrheadfoot 
\setheadsepline{0.4pt}                        
\setfootsepline{0.4pt}                            
\setkomafont{pagehead}{\bfseries}                 
\setkomafont{pagefoot}{\normalfont\footnotesize}  

\newpairofpagestyles{firstpage}
  {%
    \rohead{{\large Hausaufgabe}\\{\Large Wirtschaftsinformatik}}%
    \cohead{\textcolor{gray}{{\small Ardit Abrashi}}}%
  }

% just for dummy content
\usepackage{duckuments}

\begin{document}
\thispagestyle{firstpage}

\subsection*{MwSt-Rechner}
\begin{center}
  \includegraphics{example-image-duck}
\end{center} 
\subsection*{Code des Programms}

\blindduck[all]
\blindduck[all]

\end{document}

Answer

下面我删除了所有不相关的内容。

您可以为第一页定义一个页面样式附加项并将其与一起使用\thispagestyle。其余页面将使用默认页面样式。

\documentclass[%
 paper=a4,       
 fontsize=10pt,  
 ngerman         
 ]{scrartcl}

\usepackage[]{graphicx}
\usepackage{xcolor}

\usepackage{scrlayer-scrpage}

% not doing this will keep the page numbers etc. on the second page
%\clearscrheadfoot 
\setheadsepline{0.4pt}                        
\setfootsepline{0.4pt}                            
\setkomafont{pagehead}{\bfseries}                 
\setkomafont{pagefoot}{\normalfont\footnotesize}  

\newpairofpagestyles{firstpage}
  {%
    \rohead{{\large Hausaufgabe}\\{\Large Wirtschaftsinformatik}}%
    \cohead{\textcolor{gray}{{\small Ardit Abrashi}}}%
  }

% just for dummy content
\usepackage{duckuments}

\begin{document}
\thispagestyle{firstpage}

\subsection*{MwSt-Rechner}
\begin{center}
  \includegraphics{example-image-duck}
\end{center} 
\subsection*{Code des Programms}

\blindduck[all]
\blindduck[all]

\end{document}

Question 2

您还可以scrheadings对第一页和plain所有其他页面使用页面样式。

\PassOptionsToPackage{head height=27pt}{typearea}% removes the warning regarding the head height

%--- your preamble without the unrelated stuff:
\documentclass[%
  %paper=a4,% default
  fontsize=10pt,
  parskip=half-,% do not change \parskip and \parindent manually!
  ngerman,
  ]{scrartcl}
\usepackage{babel}

\usepackage{graphicx}
\usepackage{xcolor}

\usepackage[
  manualmark,
  headsepline=0.4pt,% do not use outdated macro \setheadsepline
  footsepline,% do not use outdated macro \setheadsepline
  plainfootsepline
  ]{scrlayer-scrpage}% sets page style scrheadings automatically

\pagestyle{plain}% plain style for all pages except first page

\clearpairofpagestyles% replaces outdated \clearscrheadfoot
\cfoot*{\pagemark}% pagemark in the center of the footer

\newcommand*\obenzentral[1]{\chead{#1}}
\newcommand*\rechts[1]{\rohead{#1}}

\setkomafont{pagehead}{\bfseries}
\setkomafont{pagefoot}{\normalfont\footnotesize}
%---

\obenzentral{%
  {\large Hausaufgabe}\\ 
  {\Large Wirtschaftsinformatik}%
}
\rechts{\textcolor{gray}{\small Ardit Abrashi}}

\usepackage{blindtext}% only for dummy text

\begin{document}

\thispagestyle{scrheadings}% page style scrheadings on first page
\subsection*{MwSt-Rechner}
\begin{center}
  \includegraphics{example-image}
\end{center} 

\subsection*{Code des Programms}
\Blindtext
\end{document}

headsepline如果所有页面上都应该有，则添加plainheadsepline到scrlayer-scrpage选项中。

补充说明：

不要使用\setheadsepline来切换头带。这是一个过时的scrpage2宏。请使用选项headsepline=0.4pt或简单选项，headsepline因为0.4pt这是默认宽度。

不要手动更改\parindent和\parsep。您可以使用选项parskip=half或parskip=half-。

Answer