Question

I have a RadGrid displaying a hierarchical structure. I want to save the expand/collapse state of each item in the grid so that when the user returns to the site, everything looks exactly as they left it. I have code to save and restore the state of expanded/collapsed items, however, I now need a way to detect which item is currently being expanded/collapsed when the user clicks on the expand/collapse icon. I know there’s a command event, but there is no command argument nor does there seem to be any indication of which item’s state is being changed. Any ideas?

Answer 1

I found that the GridCommandEventArgs passed into the RadGrid.ItemCommand event contains an ‘Item’ property that represents the item that was expanded/collapsed. If casted to a GridDataItem, one can retrieve the data key and do whatever manipulation is necessary.

protected void RadGrid_OnItemCommand(object sender, GridCommandEventArgs e)
{
    try
    {
        if(e.CommandName.Equals("ExpandCollapse"))
        {
            string id = ((GridDataItem)e.Item).GetDataKeyValue("ID").ToString();
            // ... do work on id (i.e. save state, etc.) ...
        }
    } catch(Exception ex)
    {
        // What could possibly go wrong? :)
    }
}