add vdots to a listing without breaking the box

Question

I have a problem when I try to add \vdots in an escaped string inside of a listing environment. The box is cut. How can I avoid the break of the box?

The code is this:

\lstset{language=[Sharp]C,,basicstyle=\footnotesize, showspaces=false,showtabs=false,,breaklines=true,showstringspaces=false,breakatwhitespace=true,frame=trBL, escapeinside={(*@}{@*)}}
\begin{lstlisting}
        private void Form1_Load(object sender, EventArgs e)
        {
            XDocument doc = XDocument.Load("XMLFile1.xml");
            textBox1.Text = doc.Descendants("dos").Single().Value.Replace("\n","\r\n");
            int val = textBox1.Lines.Count();
            (*@{\center\vdots}@*)
            XmlDocument doc2 = new XmlDocument();
            doc2.Load("XMLFile1.xml");
            textBox2.Text = doc2.GetElementsByTagName("dos")[0].InnerText;
        }
\end{lstlisting}

Answer 1

You can use \raisebox with its two optional arguments to set the official height and depth to zero to avoid the extra vertical spacing which rips the frame open. You can also adjust the vertical position to make the dots be appear vertical centered as well. The horizontal centering can be done using \centerline (or with \hfill <code> \hfill\null):

\documentclass{article}
\usepackage{listings}
\usepackage{mathdots}

\begin{document}
\lstset{language=[Sharp]C,,basicstyle=\footnotesize, showspaces=false,showtabs=false,,breaklines=true,showstringspaces=false,breakatwhitespace=true,frame=trBL, escapeinside={(*@}{@*)}}
\begin{lstlisting}
private void Form1_Load(object sender, EventArgs e)
{
    XDocument doc = XDocument.Load("XMLFile1.xml");
    textBox1.Text = doc.Descendants("dos").Single().Value.Replace("\n","\r\n");
    int val = textBox1.Lines.Count();
(*@\centerline{\raisebox{-1pt}[0pt][0pt]{$\vdots$}}@*)
    XmlDocument doc2 = new XmlDocument();
    doc2.Load("XMLFile1.xml");
    textBox2.Text = doc2.GetElementsByTagName("dos")[0].InnerText;
}
\end{lstlisting}
\end{document}

(I removed the spaces in front of the listing because the will push the code to much to the right)

Answer 2

Do not use \center, it's wrongly used.

You can just escape the symbol, and be sure it is not too tall.

\documentclass{article}
\usepackage{listings}
\usepackage{mathdots}

\begin{document}
\lstset{language=[Sharp]C,,basicstyle=\footnotesize, showspaces=false,showtabs=false,,breaklines=true,showstringspaces=false,breakatwhitespace=true,frame=trBL, escapeinside={(*@}{@*)}}
\begin{lstlisting}
        private void Form1_Load(object sender, EventArgs e)
        {
            XDocument doc = XDocument.Load("XMLFile1.xml");
            textBox1.Text = doc.Descendants("dos").Single().Value.Replace("\n","\r\n");
            int val = textBox1.Lines.Count();
(*@\makebox[\linewidth][c]{$\smash{\vdots}$}@*)
            XmlDocument doc2 = new XmlDocument();
            doc2.Load("XMLFile1.xml");
            textBox2.Text = doc2.GetElementsByTagName("dos")[0].InnerText;
        }
\end{lstlisting}

Answer 3

use it this way:

(*@{\hspace*{3cm}\vdots}@*)