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C#: how to use xpath to escape a token

Posted on 2014-04-30
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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)
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Question by:badtz7229
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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;" )
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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>
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LVL 18

Accepted Solution

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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.
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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");

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