ASP.NET MVC递归遍历菜单

 效果图：

SiteNavService

namespace DotNetMVC.Service { public partial class SiteNavService : BaseService<SiteNav>, ISiteNavService { private IQueryable<SiteNav> GetJoinAll() { return GetAll() .Include(u => u.FunctionalModule) .AsNoTracking(); } /// <summary>
        /// 获取菜单数据 /// </summary>
        /// <returns></returns>
        public SiteNavDTO[] GetSiteNavs() { return GetJoinAll().OrderBy(e=>e.Sort).ThenBy(e=>e.Id).ToList().Select(p => ToDTO(p)).ToArray(); } #region 递归获取菜单
        /// <summary>
        /// 递归获取菜单 /// </summary>
        /// <param name="navLevel">菜单级数， 不指定，默认返回全部</param>
        /// <returns></returns>
        public List<SiteNavDTO> GetSiteNavsByLevel(int navLevel = 0) { SiteNavDTO[] allSiteNav = GetSiteNavs(); return GetGetSiteNavs(allSiteNav, 0, navLevel); } /// <summary>
        /// 递归获取菜单 /// </summary>
        /// <param name="allSiteNav"></param>
        /// <param name="parentId"></param>
        /// <param name="navLevel"></param>
        /// <returns></returns>
        private List<SiteNavDTO> GetGetSiteNavs(SiteNavDTO[] allSiteNav, long parentId, int navLevel) { List<SiteNavDTO> list = new List<SiteNavDTO>(); //默认获取全部菜单
            IEnumerable<SiteNavDTO> childSiteNavs = allSiteNav.Where(e => e.ParentId == parentId); if (navLevel != 0) { //获取指定级数菜单
                childSiteNavs = childSiteNavs.Where(e => e.NavLevel <= navLevel); } //没有子菜单
            if (childSiteNavs.Count() <= 0) { return list; } foreach (SiteNavDTO dto in childSiteNavs) { list.Add(dto); //递归获取子菜单
 list.AddRange(GetGetSiteNavs(allSiteNav, dto.Id, navLevel)); } return list; } #endregion

        private SiteNavDTO ToDTO(SiteNav entity) { SiteNavDTO dto = new SiteNavDTO(); dto.CreateDateTime = entity.CreateDateTime; dto.Id = entity.Id; dto.FunctionalModuleId = entity.FunctionalModuleId; dto.ParentId = entity.ParentId; dto.NavLevel = entity.NavLevel; dto.NavName = entity.NavName; dto.NavTarget = entity.NavTarget; dto.NavUrl = entity.NavUrl; dto.NavImg = entity.NavImg; dto.ViewHtmlTemplate = entity.ViewHtmlTemplate; dto.ListHtmlTemplate = entity.ListHtmlTemplate; dto.Sort = entity.Sort; dto.IsShow = entity.IsShow; dto.IsEnabled = entity.IsEnabled; dto.Remark = entity.Remark; dto.FunName = entity.FunctionalModule.FunName; return dto; } } }

SiteNavController

SiteNavAddGetViewModel model = new SiteNavAddGetViewModel(); List<SelectListItem> listSiteNav = new List<SelectListItem>(); listSiteNav.Add(new SelectListItem { Value = "0", Text="一级菜单" }); foreach (SiteNavDTO dto in siteNavService.GetSiteNavsByLevel()) { SelectListItem listItem = new SelectListItem(); for (int i = 0; i < dto.NavLevel; i++) { dto.NavName = "|-" + dto.NavName; } listItem.Text = dto.NavName; listItem.Value = dto.Id.ToString(); listItem.Selected = false; listSiteNav.Add(listItem); } model.ListSiteNav = listSiteNav;

View

<span class="select-box" style="width:150px;"> @Html.DropDownList("parentNav", Model.ListSiteNav, new { @class = "select" }) </span>