xpath中的转义字符

xpath中只转义单引号和双引号两个字符

//you may want to use constants like HtmlTextWriter.SingleQuoteChar and
//HtmlTextWriter.DoubleQuoteChar intead of strings like "'" and "\""
private static string GenerateConcatForXPath(string a_xPathQueryString)
{
    string returnString = string.Empty;
    string searchString = a_xPathQueryString;
    char[] quoteChars = new char[] { '\'', '"' };
 
    int quotePos = searchString.IndexOfAny(quoteChars);
    if (quotePos == -1)
    {
        returnString = "'" + searchString + "'";
    }
    else
    {
        returnString = "concat(";
        while (quotePos != -1)
        {
            string subString = searchString.Substring(0, quotePos);
            returnString += "'" + subString + "', ";
            if (searchString.Substring(quotePos, 1) == "'")
            {
                returnString += "\"'\", ";
            }
            else
            {
                //must be a double quote
                returnString += "'\"', ";
            }
            searchString = searchString.Substring(quotePos + 1,
                             searchString.Length - quotePos - 1);
            quotePos = searchString.IndexOfAny(quoteChars);
        }
        returnString += "'" + searchString + "')";
    }
    return returnString;
}