treeview 目录必须位于该列表的界限内

   protected void InitTree()    {        var childDataView = dataContext.TestTree.Where(c => c.parentId == 0).OrderBy(c => c.id).Select(c => c);        foreach (var tree in childDataView)        {            var treeNode = new TreeNode { Text = tree.name, Value = tree.id.ToString() };            AddChildTree(treeNode, treeNode.Value);            TreeViewTest.Nodes.Add(treeNode);        }    }    /// <summary>    /// 获取子节点    /// </summary>    /// <param name="treeNode">    /// treeNode    /// </param>    /// <param name="parentId">    /// The parent id.    /// </param>    protected void AddChildTree(TreeNode treeNode, string parentId)    {        var childDataView =            dataContext.TestTree.Where(c => c.parentId == int.Parse(parentId)).OrderBy(c => c.id).Select(c => c);        foreach (var tree in childDataView)        {            var menuNode = new TreeNode { Text = tree.name, Value = tree.id.ToString() };            treeNode.ChildNodes.Add(treeNode); // 递归出现索引必须位于该列表的界限内错误            AddChildTree(menuNode, menuNode.Value);        }    }//create table TestTree//(//    id int identity(1,1) primary key,//    name varchar(20) not null,//    parentId int//)