RAZOR 页面如何递归生成菜单

[_小黑_]

如题，我想在razor页面生成树形菜单，数据库数据如下

ID	MENU_NAME	PARENT_ID	URL	ICON	ORDER
1	系统设置	0	NULL	NULL	1
2	其他设置	1	NULL	NULL	2
3	用户管理	1	User/Index	NULL	3
4	测试设置	2	OtherTest/Index	NULL	4

以下代码是前台的代码，但是只能生成2级菜单，无法生成多级的，求大神 给个思路 如何生成多级菜单

            @if (menus != null)
            {
                foreach (var module in menus.OrderBy(x => x.ORDER).Where(o => o.PARENT_ID == "0"))
                {
                    <li>
                        <a href="#">
                            <i class="@(string.IsNullOrWhiteSpace(module.ICON) ? "fa fa-tv" : module.ICON)"></i>
                            <span class="nav-label">@module.MENU_NAME</span>
                            <span class="fa arrow"></span>
                        </a>
                        <ul class="nav nav-second-level">
                            @foreach (var menu in menus.OrderBy(x => x.ORDER).Where(item => item.PARENT_ID == module.ID))
                            {
                                <li>                                    
                                    <a class="J_menuItem" href="@menu.URL" data-index="@module.ID">
                                        <i class="@(string.IsNullOrWhiteSpace(module.ICON)  ? "fa fa-angle-right" : menu.ICON)"></i>
                                        @menu.MENU_NAME
                                    </a>
                                </li>
                            }
                        </ul>

                    </li>
                }
            }

[以专业开发人员为伍]

你的那个 @foreach 没有必要写，控件直接递归调用自己就行了。

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[_小黑_]

还有其他的思路吗

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[_小黑_]

        /// <summary>
        /// 生成菜单拼接字符串
        /// </summary>
        /// <returns></returns>
        private string GenerateMenu()
        {
            StringBuilder sb = new StringBuilder();
            var lstAll = BllHelper.GetList<T_SYS_MENU_INFO>(DBTool.SqlServerMS_Tool);
            var lstParent = lstAll.FindAll(x => x.PARENT_ID == "0").ToList();
            var lstChilds = lstAll.FindAll(x => x.PARENT_ID != "0").ToList();

            if (lstParent.Any())
            {
                foreach (var top in lstParent)
                {
                    sb.AppendLine("<li>")
                        .AppendLine("<a href = \"#\" >")
                        .AppendFormat("<i class=\"{0}\"></i>", (string.IsNullOrWhiteSpace(top.ICON) ? "fa fa-tv" : top.ICON))
                        .AppendFormat("<span class=\"nav-label\">{0}</span>", top.MENU_NAME)
                        .AppendLine("<span class=\"fa arrow\"></span>")
                        .AppendLine("</a>")
                        .AppendLine("<ul class=\"nav nav - second - level\">");
                    var lstOnes = lstChilds.FindAll(x => x.PARENT_ID == top.ID).OrderBy(x => x.ORDER).ToList();
                    GetChild(sb, lstChilds, lstOnes);
                    sb.AppendLine("</ul></li>");
                }
            }

            return sb.ToString();
        }

        /// <summary>
        /// 得到子菜单项
        /// </summary>
        /// <param name="sb">StrignBuilder对象</param>
        /// <param name="lstChilds">所有子节点集合</param>
        /// <param name="lstOnes">“父”节点集合</param>
        private void GetChild(StringBuilder sb, List<T_SYS_MENU_INFO> lstChilds, List<T_SYS_MENU_INFO> lstOnes)
        {
            foreach (var chld in lstOnes)
            {
                var lstTwos = lstChilds.FindAll(x => x.PARENT_ID == chld.ID).OrderBy(x => x.ORDER).ToList();

                sb.AppendLine("<li>")
                .AppendFormat("<a class=\"J_menuItem\" href=\"{0}\" data-index=\"{1}\">", chld.URL, chld.ID)
                .AppendFormat("<i class=\"\"></i>", (string.IsNullOrWhiteSpace(chld.ICON) ? "fa fa-angle-right" : chld.ICON))
                .AppendLine(chld.MENU_NAME)
                .AppendLine("</a></li>");
                GetChild(sb, lstChilds, lstTwos);
            }
        }

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[_小黑_]

       
            var menus = BllHelper.GetList<T_SYS_MENU_INFO>(DBTool.SqlServerMS_Tool);
            lstMenus = menus;
            T_SYS_MENU_INFO menu = new T_SYS_MENU_INFO();
            menu.NavMenus = new List<T_SYS_MENU_INFO>();
            CreateMenu(menu, "0");
            ViewBag.Menu = menu;
 
        private void CreateMenu(T_SYS_MENU_INFO menu,string id)
        {
            var lst = lstMenus.Where(x => x.PARENT_ID == id).OrderBy(x => x.SORT);
            foreach (var item in lst)
            {
                T_SYS_MENU_INFO t = new T_SYS_MENU_INFO();
                t.ID = item.ID;
                t.MENU_NAME = item.MENU_NAME;
                t.URL = item.URL;
                t.ICON = item.ICON;
                t.NavMenus = new List<T_SYS_MENU_INFO>();
                CreateMenu(t, item.ID);
                menu.NavMenus.Add(t);
            }
        }

@model Domain.Entity.Sys.T_SYS_MENU_INFO

@foreach (var item in Model.NavMenus)
{
    if (item.URL == "#" || string.IsNullOrEmpty(item.URL))//
    {
        <li>
            <a href="#">
                <i class="@(string.IsNullOrWhiteSpace(item.ICON) ? "fa fa-tv" : item.ICON)"></i>
                <span class="nav-label">@item.MENU_NAME</span>
                <span class="fa arrow"></span>
            </a>
            <ul class="nav nav-second-level">
                @await Html.PartialAsync("_NavMenu", item);
            </ul>
        </li>
    }
    else //操作项
    {
        <li>
            <a class="J_menuItem" href="@item.URL" data-index="@item.ID">
                <i class="@(string.IsNullOrWhiteSpace(item.ICON)? "fa fa-angle-right" : item.ICON)"></i>
                @item.MENU_NAME
            </a>
        </li>
    }
}

@{
    Domain.Entity.Sys.T_SYS_MENU_INFO menu = ViewBag.Menu;
}
@await Html.PartialAsync("_NavMenu", menu);

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[正怒月神]

你的递归有问题。为什么是2循环的。。。很奇怪 https://blog.csdn.net/hanjun0612/article/details/50563136

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