/// <summary> /// /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void Page_Load(object sender, EventArgs e) { var sections = new List<Section> { new Section { Id = 1, Name = "中国", ParentID = 0 }, new Section { Id = 2, Name = "江西", ParentID = 1 }, new Section { Id = 3, Name = "江苏", ParentID = 1 }, new Section { Id = 4, Name = "南京", ParentID = 3 }, new Section { Id = 5, Name = "南昌", ParentID = 2 }, new Section { Id = 6, Name = "东湖区", ParentID = 5 }, new Section { Id = 7, Name = "广东", ParentID = 1 }, new Section { Id = 8, Name = "深圳", ParentID = 7 }, new Section { Id = 9, Name = "罗湖区涂聚文", ParentID = 8 } }; //sections = sections.OrderBy(x => x.ParentID).ThenBy(x => x.Name).ToList(); //var stack = new Stack<Section>(); //// Grab all the items without parents //foreach (var section in sections.Where(x => x.ParentID == default(int)).Reverse()) //{ // stack.Push(section); // sections.RemoveAt(0); //} var output = new List<Section>(); //while (stack.Any()) //{ // var currentSection = stack.Pop(); // var children = sections.Where(x => x.ParentID == currentSection.Id).Reverse(); // foreach (var section in children) // { // stack.Push(section); // sections.Remove(section); // } // output.Add(currentSection); //} //sections = output; List<MySection> mys = MenuHelper.GetMyMenuCollection(sections); //ResolveDDL<MySectionMenu>(mys); var outputlist = (from mysection in mys orderby mysection.TreeLevel descending select mysection).ToList(); var outputstringlist = (from mysection in mys orderby mysection.TreeLevel descending select mysection.Name).ToList(); for (int i = 0; i < outputlist.Count; i++) { //Response.Write(string.Format("ID:{0} ParentID: {1} TreeLevel: {2} Name:{3}<br/>", mys[i].Id, mys[i].ParentID, mys[i].TreeLevel,mys[i].Name)); Response.Write(string.Format("ID:{0} ParentID: {1} TreeLevel: {2} Name:{3}<br/>", outputlist[i].Id, outputlist[i].ParentID, outputlist[i].TreeLevel, outputlist[i].Name)); } } /// <summary> /// /// </summary> /// <typeparam name="T"></typeparam> /// <param name="mys"></param> protected void ResolveDDL<T>(List<T> mys) where T : MyBaseSection, new() { ResolveDDL<T>(mys, -1, true); } /// <summary> /// /// </summary> /// <typeparam name="T"></typeparam> /// <param name="mys"></param> /// <param name="currentId"></param> protected void ResolveDDL<T>(List<T> mys, int currentId) where T : MyBaseSection, new() { ResolveDDL<T>(mys, currentId, true); } /// <summary> /// 将一个树型结构放在一个下列列表中可供选择 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="currentId"></param> /// <param name="mys"></param> protected void ResolveDDL<T>(List<T> mys, int currentId, bool addRootNode) where T : MyBaseSection, new() { if (addRootNode) { // 所有节点的TreeLevel加一，然后添加根节点 foreach (T my in mys) { my.TreeLevel += 1; } T root = new T(); root.Name = "--根节点--"; root.Id = 0; root.TreeLevel = 0; mys.Insert(0, root); } // currentId==-1表示当前节点不存在 if (currentId != -1) { // 本节点不可点击（也就是说当前节点不可能是当前节点的父节点） // 并且本节点的所有子节点也不可点击，你想如果当前节点跑到子节点的子节点，那么这些子节点就从树上消失了 bool startChileNode = false; int startTreeLevel = 0; foreach (T my in mys) { if (my.Id == currentId) { startTreeLevel = my.TreeLevel; my.Enabled = false; startChileNode = true; } else { if (startChileNode) { if (my.TreeLevel > startTreeLevel) { my.Enabled = false; } else { startChileNode = false; } } } } } } } /// <summary> /// / /// </summary> public class Section { public int Id { get; set; } public string Name { get; set; } public int ParentID { get; set; } } /// <summary> /// /// </summary> public class MySection { public int Id { get; set; } public string Name { get; set; } public int ParentID { get; set; } public int TreeLevel { get; set; } } /// <summary> /// /// </summary> public class MySectionMenu : MyBaseSection { } /// <summary> /// /// </summary> public class MyBaseSection { public int Id { get; set; } public int ParentId { get; set; } public string Name { get; set; } /// <summary> /// 本菜单在树形结构中层级（从0开始） /// </summary> public int TreeLevel { get; set; } /// <summary> /// 是否可用（默认true） /// </summary> public bool Enabled { get; set; } /// <summary> /// 是否叶子节点（默认false） /// </summary> public bool IsTreeLeaf { get; set; } } /// <summary> /// /// </summary> public class MenuHelper { /// <summary> /// /// </summary> /// <param name="oldMenus"></param> /// <returns></returns> public static List<MySection> GetMyMenuCollection(List<Section> oldMenus) { List<MySection> newMenus = new List<MySection>(); ResolveMenuCollection(oldMenus, newMenus, 0, 0); return newMenus; } /// <summary> /// /// </summary> /// <param name="oldMenus"></param> /// <param name="newMenus"></param> /// <param name="parentId"></param> /// <param name="level"></param> /// <returns></returns> private static int ResolveMenuCollection(List<Section> oldMenus, List<MySection> newMenus, int parentId, int level) { int count = 0; foreach (Section menu in oldMenus) { if (menu.ParentID == parentId) { count++; MySection my = new MySection(); newMenus.Add(my); my.TreeLevel = level; my.Id = menu.Id; my.Name = menu.Name; my.ParentID = menu.ParentID; level++; int childCount = ResolveMenuCollection(oldMenus, newMenus, menu.Id, level); level--; } } return count; } }
显示结果：
ID:1 ParentID: 0 TreeLevel: 0 Name:中国
ID:2 ParentID: 1 TreeLevel: 1 Name:江西
ID:5 ParentID: 2 TreeLevel: 2 Name:南昌
ID:6 ParentID: 5 TreeLevel: 3 Name:东湖区
ID:3 ParentID: 1 TreeLevel: 1 Name:江苏
ID:4 ParentID: 3 TreeLevel: 2 Name:南京
ID:7 ParentID: 1 TreeLevel: 1 Name:广东
ID:8 ParentID: 7 TreeLevel: 2 Name:深圳
ID:9 ParentID: 8 TreeLevel: 3 Name:涂聚文
原标题：csharp: DataRelation objects to represent a parent/child/Level relationship
关键词：ip
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