Question

I want to set the node colors of a treeview at runtime. I populate the treeview from a collection that has the parentid, childid, and description, and I’ve added a property representing the color I want applied to the node. FWIW the source is a database, the app is C#.

In a gridview I use RowDataBound() to programmatically affect the control. Im not sure how to do so in the treeview, including which event to use (DataBound()? TreeViewDataBound()?). My research has not been fruitful so far. A code snippet would be very useful.

Answer 1

Assuming you are dealing with the standard TreeView control, you can do this in the TreeDataBound Event.

A brief example (not tested):

<asp:TreeView runat="server"
    ID="tvMyTreeView"
    OnTreeNodeDataBound="tvMyTreeView_TreeNodeDataBound"
    />

And the backend:

protected void tvMyTreeView_TreeNodeDataBound(object sender, TreeNodeEventArgs e)
{
    DataRowView dr = (DataRowView)e.Node.DataItem;
    e.Node.Style.Add("color", dr["COLOR"].ToString());
}

If you are using the Telerik RadTreeView, then the event name is NodeDataBound

You will probably have to tweak the example to better fit your needs, but hopefully this will get you started.