C# 在DataGridView中显示树形结构。

Vs2012 语言c# winform 源码可以调试，运行。在DataGridView中显示树形结构。

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace grid_test
{
    /// 

    /// 可分组的列 （该列必须是 Grid 的第一列）
    /// 

    public class DataGridViewGroupColumn : DataGridViewTextBoxColumn
    {
        public DataGridViewGroupColumn（）
        {
            CellTemplate = new DataGridViewGroupCell（）;
            ReadOnly = false;
        }
        public override bool ReadOnly
        {
            get
            {
                return base.ReadOnly;
            }
            set
            {
                base.ReadOnly = value;
            }
        }
        public override DataGridViewCell CellTemplate
        {
            get
 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        187  2019-09-21 15:06  grid_test\grid_test\App.config

     文件      18944  2019-09-24 11:21  grid_test\grid_test\bin\Debug\grid_test.exe

     文件        187  2019-09-21 15:06  grid_test\grid_test\bin\Debug\grid_test.exe.config

     文件      38400  2019-09-24 11:21  grid_test\grid_test\bin\Debug\grid_test.pdb

     文件      22984  2019-09-24 11:22  grid_test\grid_test\bin\Debug\grid_test.vshost.exe

     文件        187  2019-09-21 15:06  grid_test\grid_test\bin\Debug\grid_test.vshost.exe.config

     文件        490  2018-02-19 20:12  grid_test\grid_test\bin\Debug\grid_test.vshost.exe.manifest

     文件      10732  2019-09-24 11:21  grid_test\grid_test\DataGridViewGroupCell.cs

     文件       7263  2019-09-24 11:21  grid_test\grid_test\Form1.cs

     文件       4848  2019-09-24 11:11  grid_test\grid_test\Form1.Designer.cs

     文件       5817  2019-09-24 11:11  grid_test\grid_test\Form1.resx

     文件       3849  2019-09-21 16:01  grid_test\grid_test\grid_test.csproj

     文件        143  2019-09-21 16:01  grid_test\grid_test\grid_test.csproj.user

     文件       1308  2019-09-24 09:22  grid_test\grid_test\obj\Debug\DesignTimeResolveAssemblyReferences.cache

     文件       7128  2019-09-21 17:42  grid_test\grid_test\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       1720  2019-09-24 11:22  grid_test\grid_test\obj\Debug\grid_test.csproj.FileListAbsolute.txt

     文件        975  2019-09-24 11:21  grid_test\grid_test\obj\Debug\grid_test.csproj.GenerateResource.Cache

     文件      18944  2019-09-24 11:21  grid_test\grid_test\obj\Debug\grid_test.exe

     文件        180  2019-09-24 11:21  grid_test\grid_test\obj\Debug\grid_test.Form1.resources

     文件      38400  2019-09-24 11:21  grid_test\grid_test\obj\Debug\grid_test.pdb

     文件        180  2019-09-24 11:21  grid_test\grid_test\obj\Debug\grid_test.Properties.Resources.resources

     文件          0  2019-09-21 15:06  grid_test\grid_test\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs

     文件          0  2019-09-21 15:06  grid_test\grid_test\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs

     文件          0  2019-09-21 15:06  grid_test\grid_test\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs

     文件        521  2019-09-21 15:06  grid_test\grid_test\Program.cs

     文件       1356  2019-09-21 15:06  grid_test\grid_test\Properties\AssemblyInfo.cs

     文件       2870  2019-09-21 15:06  grid_test\grid_test\Properties\Resources.Designer.cs

     文件       5612  2019-09-21 15:06  grid_test\grid_test\Properties\Resources.resx

     文件       1096  2019-09-21 15:06  grid_test\grid_test\Properties\Settings.Designer.cs

     文件        249  2019-09-21 15:06  grid_test\grid_test\Properties\Settings.settings

............此处省略15个文件信息