TreeView node detection

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Hi Guys

Lets say I have a treeview with parent nodes that have child nodes that have grandchild nodes.

The Question I have is lets say I select a grand child node. . . .How will I detect what that grand child nodes value is and the child and parent value is of the selected grandchild?

Thanks?

Posted 12-Jun-11 20:38pm

Gigantour

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3 solutions

Solution 1

Assuming you have a TreeNode called myNode then the parent child relationship is simple:

TreeNode parent = myNode.Parent;
TreeNode grandParent = parent == null ? null : parent.Parent;

What kind of value are you talking about?

"Lets say i have a node named school and then that node has child nodes of class rooms and the classrooms has child nodes of desks.
In other words : School : class room 1 : desk 1
: desk 2
: class room 2 : desk 1
: desk 2
: class room 3 : desk 1
: desk 2
so lets say i select desk 2 of class room 3
I want to have the node values of desk 2 class room 3 and school
'Thanks"

The problem I have is that a TreeNode doesn't have a Value - it has a Text field, which would give you "desk 2" from both School:class room 1:desk 2 and School:class room 2:desk 2. But what you want sound like you have a Desk object which is associated with each of the desk nodes and which you want to retrieve via the tree. If so, then that is easy: each TreeNode has a Tag property which contains an object. If you assign your Desk instance to the appropriate TreeNode, you can retrieve it:

Desk desk = myNode.Tag as Desk;
if (desk != null)
   {
   ...
   }

Posted 12-Jun-11 20:50pm

OriginalGriff

Updated 12-Jun-11 21:26pm

v2

Comments

Gigantour 13-Jun-11 3:00am

Lets say i have a node named school and then that node has child nodes of class rooms and the classrooms has child nodes of desks.

In other words : School : class room 1 : desk 1
: desk 2
: class room 2 : desk 1
: desk 2
: class room 3 : desk 1
: desk 2

so lets say i select desk 2 of class room 3

I want to have the node values of desk 2 class room 3 and school
'Thanks

OriginalGriff 13-Jun-11 3:27am

Answer updated

Dalek Dave 13-Jun-11 3:51am

Good Answer.

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nit_singh · Accepted Answer · 2011-06-12T21:49:00

Just create a recursive function like that

private string SelectNode()
{
    return SelectNode(tvFileMaps.Nodes);
}
private string SelectNode(TreeNodeCollection tColl)
{
    foreach (TreeNode tn in tColl)
    {
        if (tn.IsSelected)
        {
            return tn.Text;
        }
        else
        {
            return SelectNode(tn.Nodes);
        }
    }
    return string.Empty;
}

This will return you the selected node value, if you want to return the parent node value then do some change in that

Reza Mansoori · Accepted Answer · 2011-06-12T21:09:00

Solution 2

Hello Dear
treeview has a property SelectedNode which detemines which node in a treeview is selected if this property is null , it means no node has been selected otherwise selected node is returned
the SelectedNode is a TreeNode and has a lot of useful propery for example
level which detemines the level of node
parent which detemines parent of node
FullPath which is a string and detemines the unique path of node in ThreeView
and ...

Posted 12-Jun-11 21:09pm

Reza Mansoori

Comments

OriginalGriff 13-Jun-11 3:20am

This is not a criticism, just a "heads-up" that your greeting does not translate well into English: "Hello Dear" has sexist connotations in parts of the Western world which may be taken badly if the addressee is female. I would recommend that you just leave it off your messages in future!