How to get specific value from a xml string in c#

Question

I have following string

<SessionInfo>
  <SessionID>MSCB2B-UKT3517_f2823910df-5eff81-528aff-11e6f-0d2ed2408332</SessionID>
  <Profile>A</Profile>
  <Language>ENG</Language>
  <Version>1</Version>
</SessionInfo>

now I want to get the value of SessionID. I tried with below ..

var rootElement = XElement.Parse(output);//output means above string and this step has values

but in here,,

var one = rootElement.Elements("SessionInfo");

it didn't work.what can I do that.

and What if the xml string like below.can we use same to get the sessionID

<DtsAgencyLoginResponse xmlns="DTS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="DTS file:///R:/xsd/DtsAgencyLoginMessage_01.xsd">
  <SessionInfo>
    <SessionID>MSCB2B-UKT351ff7_f282391ff0-5e81-524548a-11eff6-0d321121e16a</SessionID>
    <Profile>A</Profile>
    <Language>ENG</Language>
    <Version>1</Version>
  </SessionInfo>
  <AdvisoryInfo />
</DtsAgencyLoginResponse>

Solution 1

rootElement already references <SessionInfo> element. Try this way :

var rootElement = XElement.Parse(output);
var sessionId = rootElement.Element("SessionID").Value;

Solution 2

You can select node by xpath and then get value:

XmlDocument doc = new XmlDocument();
doc.LoadXml(@"<SessionInfo>
                 <SessionID>MSCB2B-UKT3517_f2823910df-5eff81-528aff-11e6f-0d2ed2408332</SessionID>
                 <Profile>A</Profile>
                 <Language>ENG</Language>
                  <Version>1</Version>
              </SessionInfo>");

string xpath = "SessionInfo/SessionID";    
XmlNode node = doc.SelectSingleNode(xpath);

var value = node.InnerText;

Comments

[MakePeaceGreatAgain]

The XElement IS ".NET-Stuff" and comes with LinqToXml. It´s absoutely okay to do it like this.

[Nick Mertin]

The call to String.Format is completely unnecessary here

[MakePeaceGreatAgain]

I guess OP is only interested in a single value, thus he won´t need this overhead of creating the classes and adding the serializer-attributes. The approach of har07 works smart and is absouteley fine for this purpose.

[har07]

@bill I agree with HimBromBeere. Anyway, the keyword is default namespace. The 2nd XML has default namespace xmlns="DTS". Try to search for how to select element in namespace using LINQ-to-XML...