给查阅项赋多个值

protected SPFieldLookupValueCollection  GetPermission()
        {

           SPFieldLookupValueCollection  dd=new SPFieldLookupValueCollection ();

        
            TreeNodeCollection tnc = tv_Channel.CheckedNodes;
            foreach (TreeNode tn in tnc)
            {
                SPFieldLookupValue v = new SPFieldLookupValue(int.Parse(tn.Value),tn.Text);
                dd.Add(v);
            
            }
            return dd;
          
        }