Read XML Attributes

[ralphtrent]

Hi
I have an xml doc set up like this

<root>
 <category name='name'>
  <element att1='value' att2='value' att3='value' />
 </category>
 <category name='name2'>
  <element att1='value' att2='value' att3='value' />
 </category>
</root>

I was successfull in reading the file and create a treeview from the xml doc. Now what I need to do is, when the user selects one of the treeview options (value of att1), I will need to reread the xml file to get the value of another attribute (att2) to tell me what to show. I am hoping that i do not need to reread the file line by line again. Is there a way around that. XPath does not seem to help me due to the way I have the xml doc set up. So I need to know how I need to do this. The alternate to all this would be to put a associate a value with the treeview display, but I not sure if that can be done, can it? (sort of like the DisplayMember and ValueMember of a comboBox)

Thanks,
RT

 

[stsuing]

As long as you have good XML XPath should work. The syntax is sometimes tricky.

You can use the TreeNode.Tag property to hold a node of XML until you need it.



For example
XmlNode node = (XmlNode)uxTreeView.SelectedNode.Tag
//Then you can an attribute like this
node.Attributes["att1"].Value

 

[ralphtrent]

I am confused by your example:
XmlNode node = (XmlNode)uxTreeView.SelectedNode.Tag

Can you please elaborate.

Here is more info. When the user clicks on the TreeView option, i take the full path and pass it to a member in a different class. I take the passed string and split it up by the \ character. Do I need to call the XPath class?

Thanks!

 

[stsuing]

Here is an example...

Start a new windows application put a treeview and 3 textboxes on the form.

private void Form1_Load(object sender, System.EventArgs e)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(@"<root>
<category name='name1'>
<element att1='name1att1Value' att2='name1att2Value' att3='name1att3Value' />
</category>
<category name='name2'>
<element att1='name2att1Value' att2='name2att2Value' att3='name2att3Value' />
</category>
</root>");

TreeNode tNode;
foreach (XmlNode xNode in doc.SelectNodes("root/category"))
{//Fill the tree
tNode = new TreeNode(xNode.Attributes["name"].Value);
//Save the node you need for later use
tNode.Tag = xNode.SelectSingleNode("element");
treeView1.Nodes.Add(tNode);
}

}

private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
/Get the node you saved in the loading of the tree and use it for something
XmlNode node = (XmlNode)treeView1.SelectedNode.Tag;
textBox1.Text = node.Attributes["att1"].Value;
textBox2.Text = node.Attributes["att2"].Value;
textBox3.Text = node.Attributes["att3"].Value;

}

 

[ralphtrent]

Thanks, i'll play with that code.

RT