undefined control sequence.

[apprenticius]

Why I get an undefined control sequence für the macro \Test outside of the \foreach loop?

\documentclass{article}
\usepackage{booktabs,datatool}

\newcommand*\hash[3]{%
	\expandafter\edef\csname #1_#2\endcsname{#3}%
	\expandafter\def\csname #1\endcsname##1{\csname #1_##1\endcsname}%
}

\newcommand*\setfullpath[2]{%
	\def\fullpath{#1/#2}%
}

\def\dirs{../folderA,../folderB}

\begin{document}
\foreach \dir in \dirs{%
	\setfullpath\dir{file.csv}
	\DTLloaddb{File}\fullpath
	\DTLforeach{File}{
		\one=CsvFileAttr1,
		\two=CsvFileAttr2%
	}{%
		\hash{Test}{\one}two
	}
	\Test{ContentOfAttr1}\\ % this one works fine.
}

\Test{ContentOfAttr1}\\  % this one crashes with "undefined control sequence. \Test"
\end{document}

[hmenke]

The body of a \foreach loop forms a TeX group, which means that definition inside the body will be local to that group. The simplest workaround is to just make your definitions global.

\newcommand*\hash[3]{%
	\expandafter\xdef\csname #1_#2\endcsname{#3}%
	\expandafter\gdef\csname #1\endcsname##1{\csname #1_##1\endcsname}%
}

[apprenticius]

Thanks alot! - This does the job!