按父，前一个和下一个id排序菜单节点

Question

我有一个小菜单，我想通过DB表ID来订购，如下所示：

  public class Obj
    {
        public string Value { get; set; }
        public int? ParentNodeId { get; set; }
        public int? PreviousNodeId { get; set; }
        public int? NextNodeId { get; set; }
    }

 private IEnumerable<MenuNodeDTO> GetSortedMenuNodes(int menuId)
    {
        var nodes = LoadMenuNodes(menuId);
        foreach (MenuNode menuNode in nodes
            .Where(s => s.MenuItemId == null && s.ParentNodeId == null)
            .OrderBy(x => x?.PreviousNodeId)
            .Where(x => x.PreviousNodeId != x.Id))
        {
            MenuNodeDTO tmpMenuNode = new MenuNodeDTO();
            tmpMenuNode.MenuNodeDtoId = menuNode.Id;
            tmpMenuNode.MenuItemCode = menuNode.MenuItem?.Code;
            tmpMenuNode.ChildMenuNodes = GetChildNodes(menuNode).ToList();
            tmpMenuNode.MenuSettings = GetMenuSettings(menuNode).ToList();
            yield return tmpMenuNode;
        }
}

示例：

Id = 1 MainMenuPoint1 ParentNodeId = null, PreviousNodeId = null, NextNodeId = 4
Id = 2 -> 1 ChildNodeFromPoint1 ParentNodeId = 1, PreviousNodeId = null, NextNodeId = null
Id = 3  --> ChildNodeFromFirstChildNode1 ParentNodeId = 2, PreviousNodeId = null, NextNodeId = null
Id = 4 MainMenuPoint2 ParentNodeId = null, PreviousNodeId = 1, NextNodeId = null

我对每个人的问题是，当id改变时，顺序不起作用。 有人知道如何通过parentid，previousid和next id进行排序，每次检查所有关系的id？

Answer 1

id