How to update an XML file (read and write)

Hi all,

I have the code to read values in an XML file:
XmlTextReader tr = new XmlTextReader(filename);
while (tr.Read())
{
if (tr.NodeType == XmlNodeType.Element)
{
tr.Read(); ...

Now I want to update some values in this XML file and save it.

I need to change the read only access to write access. I already try XmlTextWriter, but it didn't work well.

Can anybody send me a very simple sample code in C# to do it

Thanks a ot in advance,

Bertrand

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How to update an XML file (read and write)

Dr.Virusi
You cannot simultaneously read and write to the same file. You may:
- read the xml file into XmlDocument, close the reader, update the document, save it to the same filename.
- open the reader from filename and xmltextwriter to a temp file, do read and write with two different files, after you close both reader and writer, move the temp file over the input file.
I hope this answers your question.
crazy_boss

ouah....not sure I like this approach.

I just want to replace one field in my XML file. Can I open it, read and search the word I want to replace. Add the new value and save the document and close it

Your idea is good but seems very time and resource consuming if I only want to do a real update.

Also, if you could write some code that shows how to open the Writer and proceed the Update().

Thanks,

B.
adam99

XmlWriter can be created with XmlWriter.Create("FileName.xml")

See http://msdn2.microsoft.com/en-us/library/system.xml.xmlwriter_methods(VS.80).aspx.

Simplest approch for you would be to use XmlDocument:

XmlDocument doc = new XmlDocument();

doc.Load("FileName.xml");

// Edit doc ...

doc.Save("FileName.xml");

See http://msdn2.microsoft.com/en-us/library/system.xml.xmldocument.aspx.
How to update an XML file (read and write)

Answer this question

How to update an XML file (read and write)

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How to update an XML file (read and write)

How to update an XML file (read and write)

Dr.Virusi

crazy_boss

adam99