Change the color of table of contents in beamer

Question

This question discusses how to change the colour of a frame in beamer. You must add a setting outside the frame using {...}. This solution doesn't work for the table of contents. MWE below:

\documentclass{beamer}     
\usetheme{default}

\AtBeginSection[]{
    % with this one both are yellow
    \setbeamercolor{background canvas}{bg=yellow} 
    \begin{frame}
    % with this one both are white
    %\setbeamercolor{background canvas}{bg=yellow} 
    \frametitle{Table of Contents}
    \vfill
    \tableofcontents[currentsection]
    \vfill
\end{frame}
}

\begin{document}

\section{This should be yellow}

\begin{frame}

This should be white

\end{frame}

\end{document}

How can I achieve what is needed? This doesn't help either.

One solution I found is adding the table of content slide manually, using:

{
    \setbeamercolor{background canvas}{bg=yellow} 
    \frame{\tableofcontents[currentsection]}
}

But if I have a many sections, is there a way to automate the above to all ToC frames?

Answer 1

Your original code will work if you add an extra pair of {}:

\documentclass{beamer}     
\AtBeginSection{
    {
    \setbeamercolor{background canvas}{bg=yellow} 
    \begin{frame}
    \frametitle{Table of Contents}
    \vfill
    \tableofcontents[currentsection]
    \vfill
    \end{frame}
    }
}

\begin{document}

\section{This should be yellow}

\begin{frame}    
This should be white
\end{frame}

\end{document}