A simple generic TreeList

• Download TreeViewExample - 18.54 KB

Description

An easy way to convert a generic list into a hierarchical treelist.

Using the code

//A list of nested categories
List<Category> items = getItems();
TreeView<Category> tv = items.ToTreeView(
	c => c.Id, //Primary key
	c => c.ParentId //Foreign key
);
TreeControl1.SetDataSource(
	tv, //Items
	c => c.Title, //DisplayMember
	c => "javascript:alert('" + c.Title + " (id: " + c.Id.ToString() + ")');" //ValueMember
);

//A list of nested directories
TreeList<string> tree = getFolderTree(foldername);
TreeControl2.SetDataSource(
	tree, //Items
	s => s.Substring(s.LastIndexOf("\\") + 1), //DisplayMember
	s => "javascript:alert('" + Server.HtmlEncode(s).Replace(@"\", @"\\") + "');" //ValueMember
);

private TreeList<string> getFolderTree(string folder) {
	string[] folders = Directory.GetDirectories(folder);
	TreeList<string> tree = new TreeList<string>();
	foreach (string dir in folders) {
		tree.Add(dir, folder);
		tree.AddRange(getFolderTree(dir));
	}
	return tree;
}