csharp: DataRelation objects to represent a parent/child/Level relationship

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276

/// <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