Modify XML existing content in C

Question

Purpose  I plan to Create a XML file with XmlTextWriter and Modify Update some Existing Content with XmlNode SelectSingleNode    node ChildNode    InnerText   someting  etc   After I created the XML file with XmlTextWriter as below   XmlTextWriter textWriter   new XmlTextWriter  D   learning  cs  myTest xml   System Text Encoding UTF8     I practiced the code below  But failed to save my XML file   XmlDocument doc   new XmlDocument    doc Load  D   learning  cs  myTest xml     XmlNode root   doc DocumentElement  XmlNode myNode   myNode  root SelectSingleNode  descendant  books            textWriter Close     doc Save  D   learning  cs  myTest xml        I found it is not good to produce like my way   Is there any suggestion about it   I am not clear about the concepts and usage of both XmlTextWriter and XmlNode in the same project  Thank you for reading and replies

User · Answer

The XmlTextWriter is usually used for generating (not updating) XML content. When you load the xml file into an XmlDocument, you don't need a separate writer.

Just update the node you have selected and .Save() that XmlDocument.

User · Answer

Using LINQ to xml if you are using framework 3 5  using System Xml Linq   XDocument xmlFile   XDocument Load  books xml     var query   from c in xmlFile Elements  catalog   Elements  book                   select c   foreach  XElement book in query         book Attribute  attr1   Value    MyNewValue     xmlFile Save  books xml

User · Answer

Forming a XML file  XmlTextWriter xmlw   new XmlTextWriter   C  WINDOWS Temp exm xml  System Text Encoding UTF8   xmlw WriteStartDocument                xmlw WriteStartElement  examtimes    xmlw WriteStartElement  Starttime    xmlw WriteString DateTime Now AddHours 0  ToString     xmlw WriteEndElement    xmlw WriteStartElement  Changetime    xmlw WriteString DateTime Now AddHours 0  ToString     xmlw WriteEndElement    xmlw WriteStartElement  Endtime    xmlw WriteString DateTime Now AddHours 1  ToString     xmlw WriteEndElement    xmlw WriteEndElement    xmlw WriteEndDocument      xmlw Close                 To edit the Xml nodes use the below code  XmlDocument doc   new XmlDocument     doc Load   C  WINDOWS Temp exm xml     XmlNode root   doc DocumentElement  Starttime     root FirstChild InnerText    First    XmlNode root1   doc DocumentElement  Changetime     root1 FirstChild InnerText    Second    doc Save   C  WINDOWS Temp exm xml       Try this  It s C  code

User · Answer

Well  If you want to update a node in XML  the XmlDocument is fine - you needn t use XmlTextWriter   XmlDocument doc   new XmlDocument    doc Load  D   build xml    XmlNode root   doc DocumentElement  XmlNode myNode   root SelectSingleNode  descendant  books    myNode Value    blabla   doc Save  D   build xml

[c#] Modify XML existing content in C#

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