Question

Treeview web control

Asked by: d_glenn

I am using the Treeview control from MS's Internet Explorer Web Controls (http://msdn.microsoft.com/library/default.asp?url=/workshop/webcontrols/webcontrols_entry.asp)

Is it possible to reference a particular node by its name (id)?

For example, I am populating the treeview control programmatically from a sql query. I would like to be able to do something like:

myNode = TreeView1.Nodes("MyParentNode")
myNode.Nodes.Add(myChildNode)

However, it looks like you can only reference a node by its index.

Thanks for your help.

DG

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Asked On
2004-02-09 at 09:45:01ID20878546
Tags

populating

,

webcontrols

Topic

.NET

Participating Experts
1
Points
125
Comments
5

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Answers

 

by: Mikal613Posted on 2004-02-09 at 09:49:13ID: 10312298

There doesn't appear to be something like that specifically in the .NET TreeView.  Is there a particular case when you need that?  If you're using it in response to an event the tree fires, the event probably gets a TreeViewEventArgs parameter.  As part of the TreeViewEventArgs class, you get the node that is being affected by the event, so that may address the cases when you need to find the tree entry.

However, you can simulate your request by using a HashTable to cache a pointer to the node in the TreeView.  When you add a new node to the tree, also add it to a mapping HashTable.  Then, you can retrieve a tree node quickly.

private System.Windows.Forms.TreeView treeView;  // defined on your form.
private Hashtable keyList = new Hashtable();

// create a new tree item.
TreeNode node = new TreeNode("ItemXX");
keyList.Add("ItemXX", node);

Then, you can access the nodes in the tree by the hash key.  In this case, I used the name, but you can use whatever you'd like.

TreeNode myNode = keyList["ItemXX"];

 

by: Mikal613Posted on 2004-02-09 at 09:50:06ID: 10312310

Some people look to the Tag and writing their own recursive function.  You may be able to implement your own "key" like attribute by extending the TreeNode class:

Class myTreeNode
Inherits TreeNode

...
   'code for custom key property or the like
...

End Class

 

by: d_glennPosted on 2004-02-09 at 10:39:32ID: 10312908

I figured I would have to use some sort of a hash table, although I was hoping for a more elegant solution.

Also, I guess I wasn't clear in my first post, but since this is asp.net, I am using the treeview from Microsoft.Web.UI.WebControls instead of the System.Windows.Forms.TreeView.  Maybe that will change the answer?  ...wishful thinking...

 

by: d_glennPosted on 2004-02-09 at 10:39:52ID: 10312912

BTW, thanks for your comments.

 

by: Mikal613Posted on 2004-02-09 at 10:46:17ID: 10312981

Sorry my answer remains ;(

20120131-EE-VQP-002

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