Populating TreeView from OPML(XML) file

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Hello, I have a windows form with a textBox and a treeView, the textBox contains the location of an OPML file("c://documents/file.opml"). How can I parse the file and transform some extracted text into System.Windows.Forms.TreeView?
Here is an exemple of the content of the file:

C#

<?xml version="1.0" encoding="utf-8"?>
<opml version="1.1">
<head>
	<title>My Subscriptions</title>
</head>
<body>
	<outline text="Catégorie1" >
		<outline text="Sience" >
			<outline text="Science Signaling" xmlUrl="http://stke.sciencemag.org/rss/current.xml" htmlUrl="http://stke.sciencemag.org/" description="Science Signaling, the Signal Transduction Knowledge Environment" language="en" type="RSS" />
		</outline>
		<outline text="Sport" >
			<outline text="L'Equipe.fr Actu Golf" xmlUrl="http://www.lequipe.fr/rss/actu_rss_Golf.xml" htmlUrl="http://www.lequipe.fr" description="L'Equipe.fr, Toute l'actualité du golf" type="RSS" />
			<outline text="L'Equipe.fr Actu Rallye" xmlUrl="http://www.lequipe.fr/rss/actu_rss_Rallye.xml" htmlUrl="http://www.lequipe.fr" description="L'Equipe.fr, Toute l'actualité des rallyes" type="RSS" />
		</outline>
	</outline>
	<outline text="Catégorie2" >
		<outline text="economy" >
			<outline text="Business Daily" xmlUrl="http://downloads.bbc.co.uk/podcasts/worldservice/bizdaily/rss.xml" htmlUrl="http://www.bbc.co.uk/programmes/p002vsxs" description="Examining the big issues facing the global economy, Business Daily demystifies the world of money. From giant industries like aviation and automotive to the smallest scale start-up, Business Daily asks the big questions about free trade, technology and investment. There is also analysis of management and marketing trends, and what business jargon really means - together with reports on business news from around the world via the BBC's global network of reporters." type="RSS" />
			<outline text="Business &#38; Economy Coverage | PBS NewsHour Podcast | PBS" xmlUrl="http://www.pbs.org/newshour/rss/podcast_business.xml" htmlUrl="http://www.pbs.org/newshour/topic/business/" description="The latest news, analysis and reporting about Business &#38; Economy from the PBS NewsHour and its website, the feed is updated periodically with interviews, background reports and updates to put the news in a larger context." type="RSS" />
		</outline>
		<outline text="politic" >
			<outline text="Power and Politics with Evan Solomon from the 
CBC News Network (Highlights)" xmlUrl="http://www.cbc.ca/podcasting/includes/powerandpolitics.xml" htmlUrl="http://www.cbc.ca/podcasting" description="Get daily access to the movers and shakers when Evan interviews the country's most influential figures. From politicians to writers to leaders from all parts of the country." type="RSS" />
			<outline text="Politics Weekly" xmlUrl="http://www.guardian.co.uk/politics/series/politicsweekly/podcast.xml" htmlUrl="http://www.guardian.co.uk/audio" description="Political analysis from the Guardian and Observer's top journalists and commentators" type="RSS" />
		</outline>
	</outline>
</body>
</opml>

Here is what i want to show:

-Categorie1
   -sience
      Sience Signaling
   -sport
      L'Equipe.fr Actu Golf
      L'Equipe.fr Actu Rally
-Categorie2
   -economy
      Business Daily
      Business &#38; Economy Coverage | PBS NewsHour Podcast | PBS
   -politic
      Power and Politics with Evan Solomon from the...
      Politics Weekly

Posted 16-May-13 12:23pm

Nnorss

Updated 17-May-13 11:35am

v9

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Comments

Sergey Alexandrovich Kryukov 16-May-13 18:30pm

The question about TreeView makes no sense unless you specify a fully-specified type name. There are several unrelated classes with the simple name TreeView.
You always need to tag the UI library or application type you use if UI is concerned.
—SA

Nnorss 16-May-13 18:40pm

Ok Sergey i updated the question and specified the ui.

Sergey Alexandrovich Kryukov 16-May-13 19:13pm

Where did you specify it? Tag it. Don't say "Treeview" or even "TreeView". Full name, please.
—SA

Nnorss 16-May-13 19:47pm

Sorry but i don't understand what do you mean by "Full name"?

Sergey Alexandrovich Kryukov 16-May-13 19:58pm

:Doh:... fully qualified. Called "FullName" in .NET. How did you write code so far? Did you ever look at someObject.GetType().FullName?
Not "TreeView", System.Window.Controls.TreeView, or one of the other names like that...
—SA

Sergey Alexandrovich Kryukov 16-May-13 19:59pm

Honestly, you published 8 answers! Have some mercy, don't answer anymore...
—SA

Nnorss 16-May-13 20:41pm

I'm sorry this is my second week with c#, i will take that into consideration... I answer my questions because i think it can helps beginners like me, i think i shouldn't do that anymore. By all the way thank you for attention.

Sergey Alexandrovich Kryukov 16-May-13 21:03pm

Sorry, but I'm kind of shocked that you cannot answer simple question about which of the TreeView classes do you use, even after my explanations. Don't you think the question goes nowhere?

After all, what prevents you from loaded the help page on your TreeView class, I have no idea which one, and find required operations on Nodes, Node. You only need Add...

—SA

Matt T Heffron 16-May-13 21:15pm

Sergey, it appears that about half an hour before this comment of yours, Nnorss modified the question to show "System.Windows.Forms.TreeView"...

Sergey Alexandrovich Kryukov 16-May-13 21:33pm

Thank you for the note; now I can see it, but look at OP's last comment "Sorry but I dont know wich of the TreeView classes i use. I'm in visual Studio and I see only one TreeView Control, I have no ideas about the classes of TreeView".
—SA

Matt T Heffron 16-May-13 21:17pm

It is considered abuse of the site (particularly the points system) to Answer your own questions. If you've discovered something that helps to clarify the question, or to focus on a particular difficulty, use the Improve question above.

Nnorss 16-May-13 21:21pm

Oww Ok, it wasn't my attention, thanks for the information.

Nnorss 16-May-13 21:18pm

Sorry but I dont know wich of the TreeView classes i use. I'm in visual Studio and I see only one TreeView Control, I have no ideas about the classes of TreeView.

Sergey Alexandrovich Kryukov 16-May-13 21:35pm

You cannot program with classes without knowing what a class is. You even put its name in the question. You need understand what you are really doing, but just write code and see if it works...
—SA

Nnorss 16-May-13 21:56pm

I know what is a classe! When you told me that there are several unrelated classes with the simple name TreeView, I thought that there are many types of TreeView Forms! I readed some tutorials about c# TreeView and some about parsing with regex, I searched on the internet, and I still dont find how can extract what I want from the OMPL file and transform it into TreeView.

Sergey Alexandrovich Kryukov 17-May-13 20:02pm

OK, now it's better, but this is the impression from your writing... I tried to answer, please see. This is really simple stuff.
—SA

3 solutions

Solution 2

You have to read the OPML file as XmlDocument and read through nodes. Then add each node to the TreeNodes. Code is available on following link.

http://channel9.msdn.com/Forums/TechOff/180598-Loading-OPML-into-a-TreeView-C[^]

Posted 17-May-13 14:04pm

Akbar Ali Hussain

Comments

Nnorss 18-May-13 0:13am

Ok thank you but it gives me an error:
private void button2_Click(object sender, EventArgs e)
{
XmlDocument xd = new XmlDocument();

xd.Load("C:\\subscription.opml");

treeView1.Nodes.Add(new TreeNode("Feeds"));

LoadNode(xd.SelectNodes("//body/*"), treeView1.Nodes[0]);
}
private void LoadNode(XmlNodeList xmlNodes, TreeNode trvParent)
{

foreach (XmlNode xmlNode in xmlNodes)
{

TreeNode trnNewNode = new TreeNode(xmlNode.Attributes["outline"].Value); //error: the exeption nullReference is not managed...

if (xmlNode.Attributes["outline"] != null)

trnNewNode.Tag = xmlNode.Attributes["outline"].Value;

trnNewNode.Expand();

trvParent.Nodes.Add(trnNewNode);

LoadNode(xmlNode.ChildNodes, trnNewNode);

}

}

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-17T14:02:00

OK, it goes nowhere. All you need is this:
http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.treenode.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.treenode.nodes.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.forms.treenodecollection.aspx[^].

Pay attention for the last link, the several System.Windows.Forms.TreeNodeCollection.Add method. This is all you ultimately need to populate the tree view. That's all.

I fail to imagine you doing development. I feel you need to get back and learn the very basics: what is type, instance (object), variable, member, static vs. instance for all members, then OOP, everything. Only then you can get back to UI development or other advanced topic. Or maybe you have some communication problems, lack of knowledge of basic terminology, I don't know. You need to do something about it…

—SA

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-05-17T19:34:00

Nnorss wrote:
I was looking for a little explication of how to extract the "text" value of the "outline" attribute from a OPML file

Sure, I see.

This is merely an XML file; and .NET Framework's FCL offers enough possibilities for XML parsing. This is my short overview of them:

Use System.Xml.XmlDocument class. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^].
Use the class System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
See http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx[^].
Use the class System.Xml.Linq.XDocument; this is the most adequate way similar to that of XmlDocument, supporting LINQ to XML Programming.
See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^], http://msdn.microsoft.com/en-us/library/bb387063.aspx[^].

Good luck,

—SA

Populating TreeView from OPML(XML) file

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