如何在biblatex的\printbibliography中显示bib文件与bibkey

希望使用\printbibliography输出参考文献时，每个条目末尾同时显示该条目的bibkey和它所在的.bib文件名，期望格式如下：

[1] J. Doe, ``An interesting article," Journal of Interesting Stuff, vol. 42, no. 3,
pp. 123–456, 2020. [doe2020 @ file1.bib]

当前已实现bibkey的显示，以下是现有最小工作示例（MWE）：

现有LaTeX代码 #

\documentclass[12pt]{article}

\usepackage[a4paper,margin=2.05cm]{geometry}
\usepackage[backend=biber,
    maxbibnames=99,
    style=ieee,
    sorting=ynt,
    defernumbers=true
]{biblatex}
\usepackage{doi}
\usepackage{hyperref}

% 显示每条目的bibkey
\DeclareFieldFormat{bibkey}{\path{[#1]}}
\renewbibmacro{finentry}{\printfield[bibkey]{entrykey}\finentry}

\addbibresource{file1.bib}
\addbibresource{file2.bib}

\begin{document}
\nocite{*}    
\printbibliography
\end{document}

对应.bib文件内容 #

file1.bib #

@article{smith2020,
  author = {John Smith},
  title = {A Great Paper},
  journal = {Journal of Important Things},
  year = {2020},
  volume = {1},
  pages = {1--10},
  sourcefile = {mybibfile.bib}
}

@article{doe2020,
  author  = {John Doe},
  title   = {An Interesting Article},
  journal = {Journal of Interesting Stuff},
  year    = {2020},
  volume  = {42},
  number  = {3},
  pages   = {123-456},
}

file2.bib #

@article{source1:entry1,
  author = {Author One},
  title = {Title One},
  journal = {Journal One},
  year = {2020},
}

@article{source2:entry1,
  author = {Author Two},
  title = {Title Two},
  journal = {Journal Two},
  year = {2021},
}

解决方案 #

Biber会自动为每个参考文献条目记录其来源的.bib文件名，存储在datafield字段中，无需手动在bib条目里添加额外字段。只需修改finentry宏，同时输出entrykey（bibkey）和datafield（文件名）即可。

修改后的LaTeX代码中，替换原有显示bibkey的宏定义部分，改为：

% 同时显示bibkey与来源.bib文件名
\DeclareFieldFormat{bibkeywithfile}{\path{[#1 @ #2]}}
\renewbibmacro{finentry}{
  \printtext[bibkeywithfile]{\printfield{entrykey}\space @\space \printfield{datafield}}
  \finentry
}

完整修改后的LaTeX代码 #

\documentclass[12pt]{article}

\usepackage[a4paper,margin=2.05cm]{geometry}
\usepackage[backend=biber,
    maxbibnames=99,
    style=ieee,
    sorting=ynt,
    defernumbers=true
]{biblatex}
\usepackage{doi}
\usepackage{hyperref}

% 同时显示bibkey与来源.bib文件名
\DeclareFieldFormat{bibkeywithfile}{\path{[#1 @ #2]}}
\renewbibmacro{finentry}{
  \printtext[bibkeywithfile]{\printfield{entrykey}\space @\space \printfield{datafield}}
  \finentry
}

\addbibresource{file1.bib}
\addbibresource{file2.bib}

\begin{document}
\nocite{*}    
\printbibliography
\end{document}

编译后，每个参考文献条目末尾会按照期望格式显示[bibkey @ filename.bib]，例如[doe2020 @ file1.bib]。

内容的提问来源于stack exchange，提问作者ASarkar