Adding elements to an xml file in C

Question

I have an XML file formatted like this    lt Snippets gt     lt Snippet name  abc  gt       lt SnippetCode gt        testcode1      lt  SnippetCode gt     lt  Snippet gt      lt Snippet name  xyz  gt       lt SnippetCode gt             testcode2      lt  SnippetCode gt     lt  Snippet gt           lt  Snippets gt    I can successfully load the elements using XDocument  but I have trouble adding new elements  there are many functions and most of which I tried didn t work well for me   How would this be done  The new element would contain the snippet name tag and the snippet code tag  My previous approach was to open the file  and manually create the element using a string which although works  is a very bad idea   What I have tried   XDocument doc   XDocument Load spath   XElement root   new XElement  Snippet    root Add new XElement  name    name goes here     root Add new XElement  SnippetCode    SnippetCode     doc Element  Snippets   Add root   doc Save spath     And the result is this    lt Snippet gt       lt name gt name goes here lt  name gt       lt SnippetCode gt      code goes here      lt  SnippetCode gt   lt  Snippet gt    It works fine except that the name tag is generated incorrectly  It should be    lt Snippet name  abc  gt     but I can t generate that properly

User · Answer

I ve used XDocument Root Add to add elements   Root returns XElement which has an Add function for additional XElements

User · Answer

If you want to add an attribute  and not an element  you have to say so   XElement root   new XElement  Snippet    root Add new XAttribute  name    name goes here     root Add new XElement  SnippetCode    SnippetCode       The code above produces the following XML element    lt Snippet name  name goes here  gt     lt SnippetCode gt SnippetCode lt  SnippetCode gt   lt  Snippet gt

User · Answer

You need to create a new XAttribute instead of XElement   Try something like this   public static void Test         var xdoc   XDocument Parse             lt Snippets gt              lt Snippet name  abc  gt               lt SnippetCode gt                testcode1              lt  SnippetCode gt             lt  Snippet gt              lt Snippet name  xyz  gt               lt SnippetCode gt                     testcode2              lt  SnippetCode gt             lt  Snippet gt            lt  Snippets gt          xdoc Root Add          new XElement  Snippet               new XAttribute  name    name goes here                new XElement  SnippetCode    SnippetCode               xdoc Save   C  TEMP FOO XML        This generates the output    lt  xml version  1 0  encoding  utf-8   gt   lt Snippets gt     lt Snippet name  abc  gt       lt SnippetCode gt        testcode1      lt  SnippetCode gt     lt  Snippet gt     lt Snippet name  xyz  gt       lt SnippetCode gt             testcode2      lt  SnippetCode gt     lt  Snippet gt     lt Snippet name  name goes here  gt       lt SnippetCode gt SnippetCode lt  SnippetCode gt     lt  Snippet gt   lt  Snippets gt

User · Answer

You re close  but you want name to be an XAttribute rather than XElement    XDocument doc   XDocument Load spath     XElement root   new XElement  Snippet      root Add new XAttribute  name    name goes here       root Add new XElement  SnippetCode    SnippetCode       doc Element  Snippets   Add root     doc Save spath

User · Answer

This is extension to answers above  if your xml has namespace defined  xmlns  then you will get a nasty side effect when adding children - xmlns      being added to your new child element   What you want to do  assuming element you are adding belongs to same namespace as his parent  is to take namespace from parent element parentElement GetDefaultNamespace      var child   new XElement parentElement GetDefaultNamespace    Snippet   new XAttribute  Attr1    42    new XAttribute  Attr2    22     child Add new XAttribute  Attr3    777     parentElement Add child     for parent elements with multiple namespaces you can choose which one to use by changing from parentElement GetDefaultNamespace    Snippet  to parentElement GetNamespaceOfPrefix  namespacePrefixThatGoesWithColon    Snippet  e g  var child   new XElement parentElement GetNamespaceOfPrefix  namespacePrefixThatGoesWithColon    Snippet   new XAttribute  Attr1    42    new XAttribute  Attr2    22

User · Answer

lt Snippet name  abc  gt     name is an attribute  not an element  That s why it s failing  Look into using SetAttribute on the  lt Snippet gt  element    root SetAttribute  name    name goes here      is the code you need with what you have

User · Answer

Id be inclined to create classes that match the structure and add an instance to a collection then serialise and deserialise the collection to load and save the document

[c#] Adding elements to an xml file in C#

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