{public class Class1{public int ID{get;set;}public int parentID { get; set; }public int childID { get; set; }public string title { get; set; }}

@using WebApplication1.Models;@{ViewBag.Title = "About";}<h2>@ViewBag.Title.</h2><h3>@ViewBag.Message</h3><p>Use this area to provide additional information.</p>@{var totalList = new List<Class1>();//全部目录列表totalList.Add(new Class1{ ID = 1,parentID = 0, title = "title_1"});totalList.Add(new Class1{ ID = 5,parentID = 0, title = "title_5"});totalList.Add(new Class1{ ID = 12,parentID = 0, title = "title_12"});totalList.Add(new Class1{ ID = 2,parentID = 1, title = "title_2"});totalList.Add(new Class1{ ID = 3,parentID = 1, title = "title_3"});totalList.Add(new Class1{ ID = 4,parentID = 1, title = "title_4"});totalList.Add(new Class1{ ID = 6,parentID = 5, title = "title_6"});totalList.Add(new Class1{ ID = 7,parentID = 5, title = "title_7"});totalList.Add(new Class1{ ID = 8,parentID = 5, title = "title_8"});totalList.Add(new Class1{ ID = 9,parentID = 2, title = "title_9"});totalList.Add(new Class1{ ID = 10,parentID = 2, title = "title_10"});totalList.Add(new Class1{ ID = 11,parentID = 2, title = "title_11"});totalList.Add(new Class1{ ID = 13,parentID = 12, title = "title_13"});totalList.Add(new Class1{ ID = 14,parentID = 12, title = "title_14"});totalList.Add(new Class1{ ID = 15,parentID = 12, title = "title_15"});totalList.Add(new Class1{ ID = 16,parentID = 4, title = "title_16"});totalList.Add(new Class1{ ID = 17,parentID = 4, title = "title_17"});totalList.Add(new Class1{ ID = 18,parentID = 4, title = "title_18"});foreach (var item in totalList){<ul>@if (item.parentID == 0){//如果为一级目录<li>@item.title</li>if (totalList.Find(x => x.parentID == item.ID ) != null){@Show(item);}}</ul>}
}@helper Show(Class1 item){var totalList = new List<Class1>();//全部目录列表totalList.Add(new Class1 { ID = 1, parentID = 0, title = "title_1" });totalList.Add(new Class1 { ID = 5, parentID = 0, title = "title_5" });totalList.Add(new Class1 { ID = 12, parentID = 0, title = "title_12" });totalList.Add(new Class1 { ID = 2, parentID = 1, title = "title_2" });totalList.Add(new Class1 { ID = 3, parentID = 1, title = "title_3" });totalList.Add(new Class1 { ID = 4, parentID = 1, title = "title_4" });totalList.Add(new Class1 { ID = 6, parentID = 5, title = "title_6" });totalList.Add(new Class1 { ID = 7, parentID = 5, title = "title_7" });totalList.Add(new Class1 { ID = 8, parentID = 5, title = "title_8" });totalList.Add(new Class1 { ID = 9, parentID = 2, title = "title_9" });totalList.Add(new Class1 { ID = 10, parentID = 2, title = "title_10" });totalList.Add(new Class1 { ID = 11, parentID = 2, title = "title_11" });totalList.Add(new Class1 { ID = 13, parentID = 12, title = "title_13" });totalList.Add(new Class1 { ID = 14, parentID = 12, title = "title_14" });totalList.Add(new Class1 { ID = 15, parentID = 12, title = "title_15" });totalList.Add(new Class1 { ID = 16, parentID = 4, title = "title_16" });totalList.Add(new Class1 { ID = 17, parentID = 4, title = "title_17" });totalList.Add(new Class1 { ID = 18, parentID = 4, title = "title_18" });<ul>@for (int i = 0; i < totalList.Count; i++){if (item.ID == totalList[i].parentID){<li>@totalList[i].title</li>if (totalList.Find(x => x.parentID == totalList[i].ID) != null){@Show(totalList[i]);}}}</ul>
}