c# xml xpath create attribute if not in document -

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how can create attribute if doesn't exist?

/document/setup/info/att/group[@name='manu']/osis:attr[@name='time']/@value

some of documents have value attribute don't.

xml (with time no value attribute):

<?xml version="1.0" encoding="utf-8"?> <document xmlns="http://www.ns.com/ns/ns">   <setup>     <info>       <filepath>\\computer1\project\e2002307\e2002307.drg</filepath>       <att>         <group class="custom" name="manu" desc="attributes"             ord="6">           <attr num="119" name="xyz" desc="zyx" type="s" ord="1" value="s355">             <valid perm="e" max="100"/>           </attr>           <attr num="120" name="thick" desc="thick." type="r" ord="2" value="5">             <valid perm="e" min="0" max="99999"/>           </attr>           <attr num="121" name="units" desc="units." type="s" ord="4" value="mm">             <valid perm="e" expr="mm" max="80"/>           </attr>           <attr num="123" name="time" desc="minutes." type="r" ord="24">             <valid perm="e" min="0"/>           </attr>           <attr num="124" name="x" desc="x direction." type="r" ord="11" value="3">             <valid perm="e" min="0"/>           </attr>           <attr num="125" name="y" desc="y direction." type="r" ord="12" value="1">             <valid perm="e" min="0"/>           </attr>         </group>

modify xpath bit make return <attr> elements don't have value attribute instead of returning attribute :

/document/setup/info/att/group[@name='manu']/osis:attr[@name='time' , not(@value)]

then loop through xpath result , add attribute needed :

xmldocument doc; ..... var query = "/document/setup/info/att/group[@name='manu']/osis:attr[@name='time' , not(@value)]"; var nodes = doc.selectnodes(query, xmlns); foreach(xmlnode node in nodes) {     xmlattribute attr = doc.createattribute("value");     attr.value = "foo";             node.attributes.append(attr); }

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