Add child element in xml using XmlDocument C#

Question

I want to add a child elements below root elements but to be the first child elements. My current xml is like this

<?xml version="1.0" encoding="utf-8"?>
<testsuites>
 <testsuite name="classname" tests="9" failures="3" errors="6" time="2919" disabled="0" skipped="0">
  <testcase name="Setup1" time="5" classname="classname">
  </testcase>
  <testcase name="Setup2" time="49" classname="classname">
  </testcase>
  <testcase name="Setup3" time="357" classname="classname">
  </testcase>
 </testsuite>
</testsuites>

After add the element , i want it look like this

<?xml version="1.0" encoding="utf-8"?>
<testsuites>
 <properties name ="namedata" value="valuedata">
 </properties>
  <testsuite name="classname" tests="9" failures="3" errors="6" time="2919" disabled="0" skipped="0">
   <testcase name="Setup1" time="5" classname="classname">
   </testcase>
   <testcase name="Setup2" time="49" classname="classname">
   </testcase>
   <testcase name="Setup3" time="357" classname="classname">
   </testcase>
  </testsuite>
</testsuites>

What i did is

XmlDocument report = new XmlDocument();
report.Load(fileOfReport);
XmlElement root = report.CreateElement("properties");
root.SetAttribute("property name", "namedata");
root.SetAttribute("value","valuedata");
var items = report.GetElementsByTagName("testsuite");
for(int i=0; i<items.Count; i++){
    child.AppendChild(items[i]);
}
report.AppendChild(root);
report.Save(fileOfReport);

The code shows properties as a root elements which include testsuite, but actually i want it as a child elemetns which is parallel with testsuite. How should i re-structure that? Note, i can only use xmlDocument not xDocument

Thanks

Attribute name can't contain a space. That's what 0x20 is. Change property name to propertyName and it should work just fine. — MarcinJuraszek
– MarcinJuraszek, Commented May 30, 2017 at 23:06
First validate the XML you're using. And then add the new child to it. — Dirty Developer
– Dirty Developer, Commented May 30, 2017 at 23:07
Thanks @MarcinJuraszek. Your answer is right. I correct it. But i have another issue. I update the question already. Thank you very much — Jiang Jiali
– Jiang Jiali, Commented May 30, 2017 at 23:27
<propertyname ="namedata" value="valuedata"> is not xml. — Alexander Petrov
– Alexander Petrov, Commented May 31, 2017 at 0:15
@AlexanderPetrov thanks for your advice. I correct it. Sorry, i am still new to XML area. — Jiang Jiali
– Jiang Jiali, Commented May 31, 2017 at 18:55

Alexander Petrov · Accepted Answer · 2017-05-30 23:47:02Z

1

XmlDocument has plenty of useful methods. In this case, the PrependChild is convenient.

XmlDocument report = new XmlDocument();
report.Load(fileOfReport);

XmlElement root = report.CreateElement("properties");
root.SetAttribute("propertyname", "namedata");
root.SetAttribute("value", "valuedata");

report.DocumentElement.PrependChild(root);

report.Save(fileOfReport);

answered May 30, 2017 at 23:47

Alexander Petrov

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3 Comments

Jiang Jiali Over a year ago

Looks like PrependChild is the right methods to call. But i run your solution, it is still missing <properties> </properties> in the xml. it only shows <properties value property name>

Alexander Petrov Over a year ago

@JiangJiali - I just copied your code creating the element. Show valid xml, so I can write the code of its creation. Your xml in the question is incorrect.

Jiang Jiali Over a year ago

Please look the second section of my xml file, that is what I want.

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