Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

C#: how to use xpath to escape a token

Posted on 2014-04-30
5
724 Views
Last Modified: 2014-05-06
how do i use the below:

XmlNode node = doc.SelectSingleNode("/edt/ce[normalize-space(desc)='" + msg + "']/code");

in the event that the msg parameter contains an apostrophe or other special characters (since it is a string). (i.e. - Can't create Server object). This string exists in the xml . the <desc> tag does contain  special characters as well (since it's a string).

how do i escape special grammar characters like commas ,colon, parenthesis,  dash, slash , underscore)
0
Comment
Question by:badtz7229
  • 3
  • 2
5 Comments
 
LVL 18

Expert Comment

by:zc2
ID: 40032721
Replace the invalid characters in the msg with entities, something like
msg = msg.replace( "'", "&#x27;" )
0
 

Author Comment

by:badtz7229
ID: 40032729
if i use a replace it won't find it in the xml then.
for example
msg =  Can't create Server object

and my xml file contains

<edt name="errors">
      <ce>
            <code>111</code>
            <desc>Not here</desc>
      </ce>
      <ce>
            <code>222</code>
            <desc>Can't create Server object </desc>
      </ce>
</edt>
0
 
LVL 18

Accepted Solution

by:
zc2 earned 500 total points
ID: 40032786
You are right, entity does not work.
If the apostrophe only could be in the string, then we could avoid using it in the xpath:
XmlNode node = doc.SelectSingleNode("/edt/ce[normalize-space(desc)=\"" + msg + "\"]/code");
0
 

Author Comment

by:badtz7229
ID: 40032801
@ zc2
your last comment worked successfully.
thanks.
0
 
LVL 18

Expert Comment

by:zc2
ID: 40032848
This should work even if the search string contains both single and double quote characters:
            msg = "concat('" + msg.Replace( "'", "',\"'\",'" ) + "')";
            XmlNode node = doc.SelectSingleNode("/edt/ce[normalize-space(desc)=" + msg + "]/code");

Open in new window

0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
SqlDataBase 7 53
what are list of ebay api errors 1 28
C# Gridview 1 47
defining NULL or 0 10 44
This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question