Question

I would like to populate a Treeview.

Here is what I have in DB :

table : Box BoxID BoxName

table Book : BookID BookName BoxID (fk Box.BoxID)

table Chapter: ChapterID ChapterName BookID (fk Book.BookID)

As you may know a treeview is made up of treenode object. A treenode object have a text property and a tag property. The ‘text’ property is the text that it’s display on the screen for this node and the ‘tag’ is an ‘hidden’ value (usually uses to identify a node)

So in my case; the fields ending with ID will be used in the ‘tag’ property and the fields ending with Name will be used in the ‘text’ property

example : so for a book; I will use the BookID field for the ‘tag’ property and BookName field for the ‘text’ property

note : I use a dbml so I have a Book object, Box object and Chapter object and I use linq to get them from the db.

So my question is; what is the best practice to build this tree?

I have a solution but it’s really ugly because it looks like I’m duplicating the code. The problem is that the values I need to extract for the text and tag properties are identified by differents fields name in the db

So for the book level, I need to get the BookID field to populate the tag property of my node; for the box level, I need to get the BoxID field to populate the tag property , ….

How can I make a kind of generic way to do it ?

I hope I made myself clear enough, don’t hesitate to ask me questions 🙂

Thx in advance

Answer 1

Here is what I have for the moment

I get the list of box with a linq (dbml) request.

List<Box> MyListofBox = getMyListofBox(); Treenode tnBox = null; Treenode tnBook =null; foreach(Box b in MyListofBox ) {     tnBox = new TreeNode();     tnBox.tag = b.BoxID;     tnBox.text = b.BoxName;      List<Book> MyListofBook = getMyListofBookByBoxID(b.BoxID)     foreach(Book boo in MyListofBook )     {         tnBook = new TreeNode();         tnBook.tag = boo.BookID;         tnBook.text = boo.BookName;         tnBox.nodes.add(tnBook);     }     mytreeview.nodes.add(tnBox); } 

but of course I don’t like this solution…

do you have a better way ?