Hi,

I've create a xml file using xmlwriter class.

I've a problem to append new data on this file, because the create method of xmlwriter overwrite the xml file.

How can I append datas with xmlwriter without lost previous datas?

Thanks by advance.

Hi Eshohier,

You can use XMLDocument class to load XML file already existing on server. for that first add the namespace "using System.Data.Xml;"

Then create a new instance of XMLDocument like , XMLDocument doc = new XMLDocumen(); Then just load xml by saying doc.Load("pass ur xml file path here"); and then you can create XMLNode and append it to the current xml. lastly you can save xml by saying doc.save("pass ur xml file path");

if

 

Hi Eshohier,

You can use XMLDocument class to load XML file already existing on server. for that first add the namespace "using System.Data.Xml;"

Then create a new instance of XMLDocument like , XMLDocument doc = new XMLDocumen(); Then just load xml by saying doc.Load("pass ur xml file path here"); and then you can create XMLNode and append it to the current xml. lastly you can save xml by saying doc.save("pass ur xml file path");

if

Hi Eshohier,

You can use XMLDocument class to load XML file already existing on server. for that first add the namespace "using System.Data.Xml;"

Then create a new instance of XMLDocument like , XMLDocument doc = new XMLDocumen(); Then just load xml by saying doc.Load("pass ur xml file path here"); and then you can create XMLNode and append it to the current xml. lastly you can save xml by saying doc.save("pass ur xml file path");

if

you

Hi and thanks for your answer.

Can you give me a true example to do this? More explicit to create XML node and append it?

How can I convert my xmlwriter class? 

Hi Eric
With .NET 2.0 there is another new overload of XmlWriter which takes in a TextWriter which is used to specify if you need to append to the file or not
Here is a sample XmlWriterSettings settings = null;
XmlWriter writer = null;

settings.Indent = true;
settings.OmitXmlDeclaration = true;
settings.NewLineOnAttributes = true;

settings = new XmlWriterSettings();

using (StreamWriter fileWriter = new StreamWriter(@"filenamewithpath", true))
{
writer = XmlWriter.Create(fileWriter, settings);

writer.WriteStartElement("Order");
writer.WriteAttributeString("OrderID", txtOrderID.Text);
writer.WriteAttributeString("Date", DateTime.Now.ToShortDateString());
writer.WriteElementString("Amount", txtAmount.Text);
writer.WriteEndElement();

writer.Flush();
}


Girish's method would be required if you would like to insert the nodes at a particular tree hierarchy than just appending at the end.
Happy programming
Anton

there is no need to convert xmlWriter class. 

string xmlFile = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/Candidates.xml");

xmldoc = new XmlDocument();

xmldoc.Load(xmlFile);

root = xmldoc.DocumentElement;

try

{

XmlNode CandidateNode = xmldoc.CreateNode(XmlNodeType.Element, "Candidate", "");

XmlNode id = xmldoc.CreateNode(XmlNodeType.Element, "CandidateId", "");

id.InnerText = "1";

CandidateNode.AppendChild(id);

XmlNode subPositionId = xmldoc.CreateNode(XmlNodeType.Element, "SubPositionId", "");

subPositionId.InnerText = candidate.PositionId.ToString();

CandidateNode.AppendChild(subPositionId);

XmlNode firstName = xmldoc.CreateNode(XmlNodeType.Element, "FirstName", "");

firstName.InnerText = candidate.FirstName;

XmlNode lastName = xmldoc.CreateNode(XmlNodeType.Element, "LastName", "");

lastName.InnerText = candidate.LastName;

CandidateNode.AppendChild(firstName);

CandidateNode.AppendChild(lastName);

root.AppendChild(CandidateNode);

xmldoc.Save(xmlFile);

 

This will help you.