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  • C# 非递归生成树 10万+数据的一个递归 简化版

    原文：https://www.cnblogs.com/fzz2727551894/p/5501223.html

    前端：

    <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <div id="plugins1"></div>

    <link href="../jstree/themes/default/style.min.css" rel="stylesheet" />
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.js"></script>
    <script src="../jstree/jstree.min.js"></script>
    <link href="../layui-v2.5.5/layui/css/layui.css" rel="stylesheet" />
    <script type="text/javascript">
        $(function () {
            $("#plugins1").jstree({
                "checkbox": {                   
                    'three_state': true,//父子节点关联，true为关联，false为不关联
                    'tie_selection': false, //
                    'whole_node': false,//复选框与节点关联 true 为关联 false为不关联
                },
                "types": {
                    'nouser': {
                        "icon": 'layui-icon layui-icon-ok'
                    }
                },
                "plugins": ["checkbox", "types"],//加载插件 checkbox
                'core': {
                    'expand_selected_onload': true,//加载完成后默认展开所有选中节点true为选中 false为不展开
                    'themes': {
                        dots: true //取消连接线
                    },
                    'data': {
                        'url': function (node) {
                            return './Handler4.ashx';
                        },
                        'data': function (node) {
                            return { 'id': node.id };
                        }
                    }
                }
            });
        });
    </script>
</body>
</html>

    后台：

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Newtonsoft.Json;
using System.Data;
using System.Data.SqlClient;

namespace WebApplication1.jstree测试
{
    public class Handler5 : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "application/json; charset=utf-8";
            context.Response.Write(JsonConvert.SerializeObject(GetTree()));
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        //获取 tree
        public List<TreeNode> GetTree()
        {
            var dic = CreateDic();
            var tree = CreateTree(dic);
            return tree;
        }

        //生成 dic
        public Dictionary<int, TreeNode> CreateDic()
        {
            var table = GetDataTable($"select * from Projects8", null);

            //生成dictionary
            var dic = new Dictionary<int, TreeNode>();
            foreach (DataRow row in table.Rows)
            {
                var model = new TreeNode
                {
                    id = int.Parse(row["Id"].ToString()),
                    ParentId = int.Parse(row["ParentId"].ToString()),

                    text = row["ProjectName"].ToString(),
                    code = row["ProjectCode"].ToString(),
                    ComponentCode = row["ComponentCode"].ToString()
                };
                dic.Add(model.id, model);
            }
            return dic;
        }

        //生成 tree
        public List<TreeNode> CreateTree(Dictionary<int, TreeNode> dic)
        {
            var list = new List<TreeNode>();
            foreach (var pair in dic)
            {
                var pid = pair.Value.ParentId;
                if (pid == 0)
                {
                    list.Add(pair.Value);
                    continue;
                }
                if (dic.ContainsKey(pid))
                {
                    var children = (List<TreeNode>)dic[pid].children;
                    children.Add(pair.Value);
                }
            }
            return list;
        }

        //获取 DataTable
        public DataTable GetDataTable(string sql, params SqlParameter[] param)
        {
            string conStr = "data source=.\sqlexpress;initial catalog=TEST1;user id=sa;password=sa;";
            //string conStr = "data source=192.168.2.51; initial catalog=BIMManagerDb;user id=sa;password=Sql123456; ";

            DataTable dt = new DataTable();
            using (SqlConnection con = new SqlConnection(conStr))
            {
                using (SqlDataAdapter adapter = new SqlDataAdapter(sql, con))
                {
                    if (param != null)
                    {
                        adapter.SelectCommand.Parameters.AddRange(param);
                    }
                    adapter.Fill(dt);
                }
            }
            return dt;
        }

        //对象 tree
        public class TreeNode
        {
            public TreeNode()
            {
                children = new List<TreeNode>();
            }
            public int id { get; set; }
            public string text { get; set; }
            public string code { get; set; }
            public string type { get; set; }
            public object children { get; set; }
            public string ComponentCode { get; set; }
            public int ParentId { get; set; }
        }
    }
}

    SQL数据：

    USE [TEST1]
GO
/****** Object:  Table [dbo].[Projects8]    Script Date: 03/12/2020 10:34:22 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Projects8](
	[Id] [int] NOT NULL,
	[ProjectName] [nvarchar](50) NOT NULL,
	[ProjectCode] [nvarchar](max) NULL,
	[ParentId] [int] NOT NULL,
	[ProjectOrder] [int] NULL,
	[IsEnabled] [int] NOT NULL,
	[OwnerId] [int] NULL,
	[ConstructionId] [int] NULL,
	[SupervisionId] [int] NULL,
	[ContractId] [int] NULL,
	[Level] [int] NULL,
	[Quantity] [int] NULL,
	[ComponentCode] [nvarchar](max) NULL,
	[NComponentCode] [nvarchar](max) NULL,
	[TaskStatus] [int] NOT NULL,
	[VersionIng] [nvarchar](max) NULL,
	[FbxId] [nvarchar](max) NULL,
	[Descrption] [nvarchar](max) NULL,
	[PileNumber] [nvarchar](max) NULL,
	[IsSubunit] [int] NULL,
	[BiDSion] [nvarchar](max) NULL,
	[ProjectType] [nvarchar](max) NULL,
	[EquCode] [nvarchar](max) NULL,
	[NextId] [int] NULL,
	[MileageNo] [nvarchar](max) NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510321, N'兰州中通道', N'01', 0, 1, 0, NULL, NULL, NULL, NULL, 1, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510322, N'一分部', N'01.01', 510321, 1, 0, NULL, NULL, NULL, NULL, 2, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510323, N'二分部', N'01.02', 510321, 2, 0, NULL, NULL, NULL, NULL, 2, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510324, N'三分部', N'01.03', 510321, 3, 0, NULL, NULL, NULL, NULL, 2, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510325, N'四分部', N'01.04', 510321, 4, 0, NULL, NULL, NULL, NULL, 2, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510326, N'五分部', N'01.05', 510321, 5, 0, NULL, NULL, NULL, NULL, 2, NULL, N'', NULL, 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510327, N'陈家湾大桥右幅', N'01.02.01', 510323, 1, 0, NULL, NULL, NULL, NULL, 3, NULL, N'', N'cjwdq', 0, N'单位工程', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510328, N'0#台基础及下部构造', N'01.02.01.01', 510327, 1, 0, NULL, NULL, NULL, NULL, 4, NULL, N'', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510329, N'桩基钢筋加工及安装', N'01.02.01.01.01', 510328, 1, 0, NULL, NULL, NULL, NULL, 5, NULL, N'', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510330, N'0a-3桩基钢筋加工及安装', N'01.02.01.01.01.01', 510329, 1, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052273', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510331, N'0a-4桩基钢筋加工及安装', N'01.02.01.01.01.02', 510329, 2, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052278', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510332, N'0a-5桩基钢筋加工及安装', N'01.02.01.01.01.03', 510329, 3, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052286', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510333, N'0b-3桩基钢筋加工及安装', N'01.02.01.01.01.04', 510329, 4, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052280', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510334, N'0b-4桩基钢筋加工及安装', N'01.02.01.01.01.05', 510329, 5, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052284', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510335, N'0b-5桩基钢筋加工及安装', N'01.02.01.01.01.06', 510329, 6, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052285', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510336, N'桩基砼浇筑', N'01.02.01.01.02', 510328, 2, 0, NULL, NULL, NULL, NULL, 5, NULL, N'', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510337, N'0a-3桩基砼浇筑', N'01.02.01.01.02.01', 510336, 1, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052273', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510338, N'0a-4桩基砼浇筑', N'01.02.01.01.02.02', 510336, 2, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052278', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510339, N'0a-5桩基砼浇筑', N'01.02.01.01.02.03', 510336, 3, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052286', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510340, N'0b-3桩基砼浇筑', N'01.02.01.01.02.04', 510336, 4, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052280', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510341, N'0b-4桩基砼浇筑', N'01.02.01.01.02.05', 510336, 5, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052284', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
INSERT [dbo].[Projects8] ([Id], [ProjectName], [ProjectCode], [ParentId], [ProjectOrder], [IsEnabled], [OwnerId], [ConstructionId], [SupervisionId], [ContractId], [Level], [Quantity], [ComponentCode], [NComponentCode], [TaskStatus], [VersionIng], [FbxId], [Descrption], [PileNumber], [IsSubunit], [BiDSion], [ProjectType], [EquCode], [NextId], [MileageNo]) VALUES (510342, N'0b-5桩基砼浇筑', N'01.02.01.01.02.06', 510336, 6, 0, NULL, NULL, NULL, NULL, 6, NULL, N'aec-80427915-000052285', N'cjwdq', 0, N'0', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)

    mark:用博客园的markdown编辑器写文章 确实不是很方便啊，markdown语法也不太熟，慢慢来吧
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  • 原文地址：https://www.cnblogs.com/guxingy/p/12467430.html
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