C# 写个树形表格代码

以下是一个基于 C# WinForms 的树形表格代码示例：

using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

namespace TreeGridView
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            // 创建表格和数据
            DataTable table = new DataTable();
            table.Columns.Add("ID", typeof(int));
            table.Columns.Add("Name", typeof(string));
            table.Columns.Add("ParentID", typeof(int));
            table.Rows.Add(1, "Root", 0);
            table.Rows.Add(2, "Child1", 1);
            table.Rows.Add(3, "Child2", 1);
            table.Rows.Add(4, "Child3", 2);
            table.Rows.Add(5, "Child4", 2);
            table.Rows.Add(6, "Child5", 3);

            // 将数据绑定到表格控件
            treeGridView.DataSource = table;

            // 将 ParentID 列隐藏
            treeGridView.Columns["ParentID"].Visible = false;

            // 设置树形结构
            treeGridView.Columns["Name"].DefaultCellStyle.Font = new Font(treeGridView.Font, FontStyle.Bold);
            treeGridView.Columns["Name"].DefaultCellStyle.ForeColor = Color.Blue;
            treeGridView.Columns["Name"].HeaderText = "Category";
            treeGridView.Columns["ID"].HeaderText = "ID";
            treeGridView.Columns["Name"].Width = 200;
            treeGridView.Columns["ID"].Width = 50;
            treeGridView.Columns["Name"].DisplayIndex = 0;
            treeGridView.Columns["ID"].DisplayIndex = 1;
            treeGridView.Columns["ID"].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            treeGridView.Columns["ID"].ReadOnly = true;
            treeGridView.Columns["Name"].ReadOnly = true;
            treeGridView.Columns["Name"].Frozen = true;
            treeGridView.Columns["Name"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;

            // 设置行高
            treeGridView.RowTemplate.Height = 30;
        }

        private void treeGridView_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (treeGridView.Columns[e.ColumnIndex].Name == "Name")
            {
                int parentID = (int)treeGridView.Rows[e.RowIndex].Cells["ParentID"].Value;
                if (parentID == 0)
                {
                    e.CellStyle.BackColor = Color.LightGray;
                }
                else
                {
                    e.CellStyle.BackColor = Color.White;
                }
                int level = GetLevel(treeGridView.Rows[e.RowIndex]);
                e.CellStyle.Padding = new Padding(level * 20, 0, 0, 0);
            }
        }

        private int GetLevel(DataGridViewRow row)
        {
            int level = 0;
            while (row.Cells["ParentID"].Value != DBNull.Value && (int)row.Cells["ParentID"].Value != 0)
            {
                level++;
                int parentID = (int)row.Cells["ParentID"].Value;
                row = treeGridView.Rows.Cast<DataGridViewRow>().First(r => (int)r.Cells["ID"].Value == parentID);
            }
            return level;
        }
    }
}

这个树形表格包含 ID、Name 和 ParentID 三列，其中 ParentID 表示该行的父节点 ID。在代码中，我们将 ParentID 列隐藏，然后通过修改 Name 列的样式来实现树形结构。在 `CellFormatting` 事件中，我们设置了 Name 列的背景色、缩进和字体样式，从而实现树形结构。在 `GetLevel` 方法中，我们计算了每一行的层级，以便于设置缩进。