How to Get XML Node from XDocument

Question

How to Get an XML Element from XDocument using LINQ    Suppose I have an XDocument Named XMLDoc which is shown below    lt Contacts gt          lt Node gt              lt ID gt 123 lt  ID gt              lt Name gt ABC lt  Name gt          lt  Node gt          lt Node gt              lt ID gt 124 lt  ID gt              lt Name gt DEF lt  Name gt          lt  Node gt   lt  Contacts gt   XElement Contacts   from xml2 in XMLDoc Elements  Contacts   Elements  Node                       where xml2 Element  ID   Value    variable                     select xml2    But I am getting Error  Object Reference is NOT to set        How to get a particular Node from a XML file using LINQ   And I want to update some values in that node    How it is possible       Thanks in advance

User · Answer

The  Elements operation returns a LIST of XElements - but what you really want is a SINGLE element  Add this   XElement Contacts    from xml2 in XMLDoc Elements  Contacts   Elements  Node                       where xml2 Element  ID   Value    variable                     select xml2  FirstOrDefault      This way  you tell LINQ to give you the first  or NULL  if none are there  from that LIST of XElements you re selecting   Marc

User · Answer

test xml    lt  xml version  1 0  encoding  utf-8   gt   lt Contacts gt     lt Node gt       lt ID gt 123 lt  ID gt       lt Name gt ABC lt  Name gt     lt  Node gt     lt Node gt       lt ID gt 124 lt  ID gt       lt Name gt DEF lt  Name gt     lt  Node gt   lt  Contacts gt    Select a single node   XDocument XMLDoc   XDocument Load  test xml    string id    123      id to be selected  XElement Contact    from xml2 in XMLDoc Descendants  Node                       where xml2 Element  ID   Value    id                     select xml2  FirstOrDefault     Console WriteLine Contact ToString       Delete a single node   XDocument XMLDoc   XDocument Load  test xml    string id    123    var Contact    from xml2 in XMLDoc Descendants  Node                  where xml2 Element  ID   Value    id                select xml2  FirstOrDefault     Contact Remove    XMLDoc Save  test xml      Add new node   XDocument XMLDoc   XDocument Load  test xml     XElement newNode   new XElement  Node       new XElement  ID    500        new XElement  Name    Whatever       XMLDoc Element  Contacts   Add newNode   XMLDoc Save  test xml

[c#] How to Get XML Node from XDocument

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