Treeview -> TreeNode -> Object

[Craig Lister]

I have a treeview with a Root, a Contact Type, and a Contact. Like MSN
Messenger.

Is there a way that I can say something like

if treenode.tag is classContact then
string Surname = treenode.tag.surname

And somehow, each time, I create the node, I can assign the object of that
classContact to that node ?

I think the 'Tag' part of the TreeNode would be used, but not sure how...

 

[Robbe Morris [C# MVP]]

Yes, here is a sample as to how:

http://www.eggheadcafe.com/articles/treeview_databinding.asp

--
2004 and 2005 Microsoft MVP C#
Robbe Morris
http://www.masterado.net

Earn $$$ money answering .NET Framework
messageboard posts at EggHeadCafe.com.
http://www.eggheadcafe.com/forums/merit.asp

 

[Craig Lister]

Thanks.

I'm looking to assign a class object that I have created, to my treenode
though...

Something like Treeview.SelectedNode.Tag = myObject..

And then later, I'd like to be able to access this objects properties via
the treenode.tag. Is this possible ?

Craig

 

[AlexS]

Yes,

myObjectType myObject = new myObjectType( ...);
....
treeView.SelectedNode.Tag = myObject;
....
((myObjectType)treeView.SelectedNode.Tag).MyObjectProperty = newValue;
....
HTH
Alex

 

[Craig Lister]

Thanks for the reply..

Getting an error:
Unable to cast object of type 'System.Int32' to type
'Address_Book_on_Steroids.classContact'.

on the following line:

MessageBox.Show(((classContact)tvMaster.SelectedNode.Tag).Title);



Where



tvMaster is the TreeView

 

[Robbe Morris [C# MVP]]

Right. That code sample does it with a DataRow. You could
just as easily do it with your class instead.

--
2004 and 2005 Microsoft MVP C#
Robbe Morris
http://www.masterado.net

Earn $$$ money answering .NET Framework
messageboard posts at EggHeadCafe.com.
http://www.eggheadcafe.com/forums/merit.asp

 

[Morten Wennevik]

Hi Craig,

Your Tag contains a number (System.Int32) and trying to cast it to classContact will then fail.
Are all your tags classContact? Or are some of them different data types.

object o = tvMaster.SelectedNode.Tag
if(o is classContact)
{
classContact c = (classContact)o;
MessageBox.Show(c.Title);
}