\thefield, entrykey an \xifinlist

Question

I try to use \thefield in combination with \xifinlist. That works for all field, except for entrykey.

See this MWE

\documentclass{article}
\usepackage[style=verbose]{biblatex}
\addbibresource{\jobname.bib}
\begin{filecontents}{\jobname.bib}
@book{CPG,
    title={CPG},

}
\end{filecontents}
\listadd{\toto}{CPG}
\renewbibmacro{begentry}{
  \xifinlist{\thefield{entrykey}}{\toto}{oui}{non}

  \xifinlist{\thefield{title}}{\toto}{oui}{non}
}
\begin{document}
\nocite{CPG}
\printbibliography
\end{document}

I expected the first test would result "oui", but it results "non".

Any idea?

Answer 1

The problem is that biblatex detokenize the entrykey field.

So

\documentclass{article}
\usepackage[style=verbose]{biblatex}
\addbibresource{\jobname.bib}
\begin{filecontents}{\jobname.bib}
@book{CPG,
    title={CPG},

}
\end{filecontents}
\listeadd{\toto}{\detokenize{CPG}}
\renewbibmacro{begentry}{
  \xifinlist{\thefield{entrykey}}{\toto}{oui}{non}

  \xifinlist{\thefield{title}}{\toto}{oui}{non}
}
\begin{document}
\nocite{CPG}
\printbibliography
\end{document}

Solve my issue.