How to delete node from XML file using C

Question

Possible Duplicate    How to remove an XmlNode from XmlNodeList     Hi  How can i delete a set of nodes from an XML file    Here is a code snippet   string path     C  Documents and Settings e454935 Desktop NUnitSettings xml   FileStream fs   new FileStream path  FileMode Open  FileAccess Read  FileShare ReadWrite   System Xml XmlDocument xmldoc   new System Xml XmlDocument    xmldoc Load fs   fs Close    xmldoc DocumentElement RemoveChild xmldoc DocumentElement ChildNodes 1    FileStream WRITER   new FileStream path  FileMode Truncate  FileAccess Write  FileShare ReadWrite   xmldoc Save WRITER   WRITER Close       I tried the following code simply to delete a node and got  Object reference not set to an instance of an object   at   xmldoc DocumentElement RemoveChild xmldoc DocumentElement ChildNodes 1      Here is a sample XML file    lt  xml version  1 0   gt   lt Xml1 gt     lt Settings gt       lt Setting name  DisplayFormat  value  Full    gt       lt Setting name  File1  value  a    gt       lt Setting name  File1  value  b    gt       lt Setting name  File1  value  c    gt       lt Setting name  File1  value  d    gt     lt  Settings gt   lt  Xml1 gt    Actually from this file i want to delete the Four File1 nodes which has the values  a b c d  and then i want to add a node    lt Setting name  File1  value  e    gt    How can i do this

User · Answer

You can use Linq to XML to do this   XDocument doc   XDocument Load  input xml    var q   from node in doc Descendants  Setting           let attr   node Attribute  name           where attr    null  amp  amp  attr Value     File1          select node  q ToList   ForEach x   gt  x Remove     doc Save  output xml

User · Answer

DocumentElement is the root node of the document so childNodes 1  doesn t exist in that document  childNodes 0  would be the  lt Settings gt  node

User · Answer

It may be easier to use XPath to locate the nodes that you wish to delete  This stackoverflow thread might give you some ideas   In your case you will find the four nodes that you want using this expression   XmlDocument doc   new XmlDocument    doc Load fileName   XmlNodeList nodes   doc SelectNodes    Setting  name  File1

User · Answer

Deleting nodes from XML              XmlDocument doc   new XmlDocument                doc Load path               XmlNodeList nodes   doc SelectNodes    Setting  name  File1                  for  int i   nodes Count - 1  i  gt   0  i--                                nodes i  ParentNode RemoveChild nodes i                              doc Save path     Adding attribute to Nodes in XML      XmlDocument originalXml   new XmlDocument        originalXml Load path       XmlNode menu   originalXml SelectSingleNode    Settings        XmlNode newSub   originalXml CreateNode XmlNodeType Element   Setting   null       XmlAttribute xa   originalXml CreateAttribute  name        xa Value    qwerty       XmlAttribute xb   originalXml CreateAttribute  value        xb Value    555       newSub Attributes Append xa       newSub Attributes Append xb       menu AppendChild newSub       originalXml Save path

[c#] How to delete node from XML file using C#

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