How to write an xml attribute without replace all attributes?

Question

I'm using this:

public void WriteSettings(string key, string value)
{
    XmlWriterSettings xmlSettings = new XmlWriterSettings();
    xmlSettings.Indent = true;
    xmlSettings.NewLineOnAttributes = true;

    XmlWriter writer = XmlWriter.Create(TMP_FULLPATH, xmlSettings);
    writer.WriteStartElement("settings");
    writer.WriteAttributeString(key, value);
    writer.WriteEndAttribute();
    writer.WriteEndDocument();
    writer.Flush();
    writer.Close();
}

But any modification replaces all attributes with only the last remaining attribute that I am trying to add. For example:

current XML:

<?xml version="1.0" encoding="utf-8"?>
<settings TitleFormat="name:%name% date:%date%" />

when I do:

WriteSettings("foo", "baa");

the XML is:

<?xml version="1.0" encoding="utf-8"?>
<settings foo="baa" />

instead of:

<?xml version="1.0" encoding="utf-8"?>
<settings TitleFormat="name:%name% date:%date%" foo="baa" />

How can I fix that?

Marc Gravell · Accepted Answer · 2011-12-29 13:18:51Z

1

You are writing a new file, with no consideration at all of the old. To update a document, you must load it into a DOM, edit the DOM, and save the DOM:

var doc = new XmlDocument();
doc.Load(path);
doc.DocumentElement.SetAttribute(key, value);
doc.Save(path);

answered Dec 29, 2011 at 13:18

Marc Gravell

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Comments

abatishchev · Accepted Answer · 2011-12-29 13:19:56Z

1

you are creating new file each time you call XmlWriter.Create(), do something like this.

edited Dec 29, 2011 at 13:19

abatishchev

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answered Dec 29, 2011 at 13:18

Brijesh Mishra

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