Solved

C#: how to use xpath to escape a token

Posted on 2014-04-30
5
742 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

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

I was working on a PowerPoint add-in the other day and a client asked me "can you implement a feature which processes a chart when it's pasted into a slide from another deck?". It got me wondering how to hook into built-in ribbon events in Office.
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

749 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