Exception when creating XML file on c# with WriteStartElement()

Question

So here is the code that throws the exception

    #region Header
            if (textBox2.Text != "")
            {
                try
                {
                    xmlTW.WriteStartElement("Header");
                    xmlTW.WriteRaw(Environment.NewLine);
                    xmlTW.WriteString(textBox2.Text);
                    xmlTW.WriteRaw(Environment.NewLine);
                    xmlTW.WriteEndElement();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
            #endregion


            #region Body
            if (textBox3.Text != "")
            {
                try
                {
                    xmlTW.WriteStartElement("Rectangles");
                    xmlTW.WriteRaw(Environment.NewLine + textBox3.Text + Environment.NewLine);
                    xmlTW.WriteEndElement();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
            #endregion

So, the problem is that the code will run smoothly only if one of the two textboxes is filled with data, if both of them contain text i get an invalid operation exception at WriteEndDocument();

I know it must be something simple, but i just can't figure it out :P . Any help is appreciated.

Thanks in advance.

Do you have this at the beginning of the document? <?xml version="1.0" encoding="utf-8"?> — Emmanouil Chountasis
– Emmanouil Chountasis, Commented May 27, 2013 at 18:58

YK1 · Accepted Answer · 2013-05-27 19:30:12Z

4

Well-formed XML must have a Single root element. Following is well-formed XML:

<Header>
Some text
</Header>

It is well-formed because Header is root element there. However, following is not well-formed:

<Header>
Some text
</Header>
<Rectangles>
Some other text
</Rectangles>

To correct it, you got to put it in some root element.

<myRoot>
<Header>
Some text
</Header>
<Rectangles>
Some other text
</Rectangles>
</myRoot>

edited May 27, 2013 at 19:30

answered May 27, 2013 at 19:00

YK1

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1 Comment

Mitsosp Over a year ago

Thanks a lot, didn't know i had to wrap everything in a generic container.

Mzf · Accepted Answer · 2013-05-27 19:08:03Z

3

You need to set the XmlWriterSettings ConformanceLevel to Fragment.

This will enable you keep the xml struct that you wanted without adding root element

var xmlWriterSettings = new XmlWriterSettings();
xmlWriterSettings.ConformanceLevel = ConformanceLevel.Fragment;

and create you xml write like this:

XmlWriter xmlTW = XmlWriter.Create("myFile.xml", xmlWriterSettings)

This link can help you start working with XmlWriter

answered May 27, 2013 at 19:08

Mzf

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2 Comments

Mitsosp Over a year ago

Oh i see , this is very helpful, both answers are accepted, but i already solved it using the above solution.Will keep in mind your solution as well,also thanks for the tutorial.I will upvote once i reach the rep required. Thanks again.

YK1 Over a year ago

This may probably resolve exception. However, I think its better practice to keep your XML well-formed.

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