标签:TreeNode 递归 C# List list Add new public
声明一个Model类:
public class TreeNode { /// <summary> /// 子id /// </summary> public string Id { get; set; } /// <summary> /// 父id /// </summary> public string ParentId { get; set; } /// <summary> /// 名称 /// </summary> public string Name { get; set; } /// <summary> /// 子节点 /// </summary> public List<TreeNode> Children { get; set; } /// <summary> /// 无参构造函数 /// </summary> public TreeNode() { Children = new List<TreeNode>(); } /// <summary> /// 有参构造函数 /// </summary> /// <param name="id">子id</param> /// <param name="name">名称</param> /// <param name="parentId">父id</param> public TreeNode(string id, string name, string parentId) { this.Id = id; this.Name = name; this.ParentId = parentId; Children = new List<TreeNode>(); } /// <summary> /// 有参构造函数 /// </summary> /// <param name="id">子id</param> /// <param name="name">名称</param> /// <param name="parent">父节点</param> public TreeNode(string id, string name, TreeNode parent) { this.Id = id; this.Name = name; this.ParentId = parent.Id; Children = new List<TreeNode>(); } }
生成一个转换前的list集合:
TreeNode treeNode1 = new TreeNode("1", "山东", "0"); TreeNode treeNode2 = new TreeNode("2", "北京", "0"); TreeNode treeNode3 = new TreeNode("3", "历下区", treeNode1); TreeNode treeNode4 = new TreeNode("4", "高新区", treeNode1); TreeNode treeNode5 = new TreeNode("5", "历城区", treeNode1); TreeNode treeNode6 = new TreeNode("6", "甸柳庄", treeNode3); TreeNode treeNode7 = new TreeNode("7", "济南长途汽车站东站", treeNode6); TreeNode treeNode8 = new TreeNode("8", "朝阳区", treeNode2); TreeNode treeNode9 = new TreeNode("9", "海淀区", treeNode2); TreeNode treeNode10 = new TreeNode("10", "金盏乡", treeNode8); List<TreeNode> list = new List<TreeNode>(); list.Add(treeNode1); list.Add(treeNode2); list.Add(treeNode3); list.Add(treeNode4); list.Add(treeNode5); list.Add(treeNode6); list.Add(treeNode7); list.Add(treeNode8); list.Add(treeNode9); list.Add(treeNode10);
递归方式
调用方式:
List<TreeNode> trees1 = TreeHelper.BulidTreeByRecursive(list, new List<TreeNode>(), "0");
实现代码:
/// <summary> /// 使用递归方法建树 /// </summary> public static List<TreeNode> BulidTreeByRecursive(List<TreeNode> treeNodes, List<TreeNode> resps, string pID) { resps = new List<TreeNode>(); List<TreeNode> tempList = treeNodes.Where(c => c.ParentId == pID).ToList(); for (int i = 0; i < tempList.Count; i++) { TreeNode node = new TreeNode(); node.Id = tempList[i].Id; node.ParentId = tempList[i].ParentId; node.Name = tempList[i].Name; node.Children = BulidTreeByRecursive(treeNodes, resps, node.Id); resps.Add(node); } return resps; }
双层循环
调用方式:
List<TreeNode> trees = TreeHelper.BulidTree(list);
实现代码:
/// <summary> /// 双层循环 /// </summary> /// <param name="treeNodes"></param> /// <returns></returns> public static List<TreeNode> BulidTree(List<TreeNode> treeNodes) { try { List<TreeNode> trees = new List<TreeNode>(); foreach (var treeNode in treeNodes) { if ("0" == (treeNode.ParentId)) { trees.Add(treeNode); } foreach (var it in treeNodes) { if (it.ParentId == treeNode.Id) { treeNode.Children.Add(it); } } } return trees; } catch (Exception ex) { throw ex; } }
标签:TreeNode,递归,C#,List,list,Add,new,public 来源: https://www.cnblogs.com/123525-m/p/16131372.html
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