C#中实现一个TreeGridView(树形表格)附源码下载

末蓝、 2024-04-17 05:29 59阅读 0赞

## 场景 ##

### 效果 ###

![20190822135532361.gif][]

### 示例源码下载 ###

[https://download.csdn.net/download/badao\_liumang\_qizhi/11593399][https_download.csdn.net_download_badao_liumang_qizhi_11593399]

## 实现 ##

新建一个Winform程序，然后在页面上拖拽一个DataGridView和一个Button。

布局如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

其中DataGridView点击右上角新增列，然后添加两列。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

右击项目-添加--类

其中后三个字段属性是必须的，Level代表节点层次，ChildList代表子节点。

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    
    namespace TreeGridViewTestOnly
    {
        public class Person
        {
            public int id;
    
            public int Id
            {
                get { return id; }
                set { id = value; }
            }
    
            public string password;
    
            public string Password
            {
                get { return password; }
                set { password = value; }
            }
    
            private int level;
    
            public int Level
            {
                get { return level; }
                set { level = value; }
            }
    
            private bool isExpanded;
    
            public bool IsExpanded
            {
                get { return isExpanded; }
                set { isExpanded = value; }
            }
    
            private List<Person> childList;
    
            public List<Person> ChildList
            {
                get { return childList; }
                set { childList = value; }
            }
        }
    }

双击窗体进入窗体的加载事件中

private void Form1_Load(object sender, EventArgs e)
            {
                //首先生成数据
                this.GenerateData();
                //然后生成列
                this.GenerateClo();
    
            }

在生成数据的方法中

/// <summary>
            /// 生成数据
            /// </summary>
            private void GenerateData() {
                for (int i = 0; i < 100; i++)
                {
                    Person p1 = new Person() { Id = i, Password = "密码" + i, Level = 1 };
                    for (int j = 0; j < 10; j++)
                    {
                        Person p2 = new Person() { Id = j, Password = "密码" + j, Level = 2 };
                        for (int k = 0; k < 10; k++)
                        {
                            Person p3 = new Person() { Id = k, Password = "密码" + k, Level = 3 };
                            if (p2.ChildList == null)
                            {
                                p2.ChildList = new List<Person>();
                            }
                            p2.ChildList.Add(p3);
                        }
                        if (p1.ChildList == null)
                        {
                            p1.ChildList = new List<Person>();
                        }
                        p1.ChildList.Add(p2);
                    }
                    personList.Add(p1);
                }
            }

如果是三层树结构就这样三层循环，几层机构依次类推。

在生成列的方法中

private void GenerateClo()
            {
                this.dataGridView1.ReadOnly = true;
                this.dataGridView1.AllowUserToAddRows = false;
                this.dataGridView1.AllowUserToDeleteRows = false;
                this.dataGridView1.AllowUserToOrderColumns = false;
                this.dataGridView1.AllowUserToResizeRows = false;
                this.dataGridView1.AllowUserToResizeColumns = false;
    
                #region 影响性能
    
                this.dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
                this.dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
    
                this.dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
                this.dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
    
                #endregion
    
                this.dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None;
                //this.dataGridView1.EditMode = DataGridViewEditMode.EditProgrammatically;
                this.dataGridView1.RowHeadersVisible = false;
                this.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    
                this.dataGridView1.VirtualMode = true;
    
                this.dataGridView1.CellValueNeeded -= dataGridView1_CellValueNeeded;
                this.dataGridView1.CellValueNeeded += dataGridView1_CellValueNeeded;
    
    
                this.dataGridView1.Columns.Clear();
    
                int colWidth = 100;
    
                DataGridViewImageColumn colImg = new DataGridViewImageColumn();
                colImg.HeaderText = String.Empty;
                colImg.Width = 20;
    
                DataGridViewTextBoxColumn colId = new DataGridViewTextBoxColumn();
                colId.Name = "colId";
                colId.HeaderText = "序号";
                colId.MinimumWidth = 160;
    
    
    
                DataGridViewTextBoxColumn colA = new DataGridViewTextBoxColumn();
                colA.HeaderText = "ID";
                colA.Width = colWidth;
    
                DataGridViewTextBoxColumn colB = new DataGridViewTextBoxColumn();
                colB.HeaderText = "密码";
                colB.Width = colWidth;
    
    
    
    
                this.dataGridView1.Columns.Add(colId);
                this.dataGridView1.Columns.Add(colA);
                this.dataGridView1.Columns.Add(colB);
    
    
                foreach (DataGridViewColumn col in this.dataGridView1.Columns)
                {
                    col.ReadOnly = true;
                }
    
                this.dataGridView1.CellMouseClick += dataGridView1_CellMouseClick;
            }

其中生成列所用到的方法

private void dataGridView1_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
            {
                if (e.RowIndex >= this.dataGridView1.RowCount || e.RowIndex > this.personList.Count)
                {
                    return;
                }
                Random r = new Random();
                r.NextDouble();
                Person record = this.personList[e.RowIndex];
                object[] values = new object[] { record.Id, record.id, record.password };
                e.Value = values[e.ColumnIndex];
    
                if (e.ColumnIndex == 0)
                {
                    Person currRecord = this.personList[e.RowIndex];
                    if (currRecord.ChildList != null && currRecord.ChildList.Count > 0)
                    {
                        if (currRecord.IsExpanded)
                        {
                            e.Value = GenerateSpace(currRecord.Level) + "  [-]  " + values[e.ColumnIndex];
                        }
                        else
                        {
                            e.Value = GenerateSpace(currRecord.Level) + "  [+]  " + values[e.ColumnIndex];
                        }
                    }
                    else
                    {
                        e.Value = GenerateSpace(currRecord.Level + 1) + values[e.ColumnIndex];
                    }
                }
            }
    
            /// <summary>
            /// 根据节点级别生成要显示的空格数
            /// </summary>
            /// <param name="level"></param>
            /// <returns></returns>
            public string GenerateSpace(int level)
            {
                int step = 5;
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < step * (level - 1); i++)
                {
                    sb.Append(" ");
                }
                return sb.ToString();
            }
            void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
            {
                if (dataGridView1.Columns[e.ColumnIndex].Name == "colId")
                {
    
                    Console.WriteLine("MouseClick...");
                    if (this.personList[e.RowIndex].ChildList != null && this.personList[e.RowIndex].ChildList.Count > 0)
                    {
                        if (this.personList[e.RowIndex].IsExpanded)
                        {
                            //this.lst2.RemoveRange(e.RowIndex + 1, this.lst2[e.RowIndex].ChildList.Count);
                            this.RecursiveRemove(this.personList, e.RowIndex);
                            this.personList[e.RowIndex].IsExpanded = false;
                            this.ShowData(this.personList);
                        }
                        else
                        {
                            this.personList.InsertRange(e.RowIndex + 1, this.personList[e.RowIndex].ChildList);
                            this.personList[e.RowIndex].IsExpanded = true;
                            this.ShowData(this.personList);
                        }
    
                        this.dataGridView1.Rows[0].Selected = false;
                        this.dataGridView1.Rows[e.RowIndex].Selected = true;
                    }
                }
            }
    
            /// <summary>
            /// 递归移除
            /// </summary>
            /// <param name="lst"></param>
            /// <param name="index"></param>
            /// <param name="count"></param>
            public void RecursiveRemove(List<Person> lst, int index)
            {
                int count = GetAllExpandChildCount(lst[index]);
                lst.RemoveRange(index + 1, count);
            }
    
            public int GetAllExpandChildCount(Person r)
            {
                if (r.ChildList != null && r.ChildList.Count > 0)
                {
                    int cnt = 0;
                    if (r.IsExpanded)
                    {
                        cnt = r.ChildList.Count;
                        for (int i = 0; i < r.ChildList.Count; i++)
                        {
                            cnt += GetAllExpandChildCount(r.ChildList[i]);
                        }
                    }
    
                    r.IsExpanded = false;
                    return cnt;
                }
                else
                {
                    return 0;
                }
            }

然后声明一个全局变量存放数据

public partial class Form1 : Form
        {
            public List<Person> personList = new List<Person>();

在Button的点击事件中

private void button1_Click(object sender, EventArgs e)
            {
                this.ShowData(this.personList);
            }
    
            public void ShowData(List<Person> lst)
            {
                int recordCount = lst.Count;
                this.dataGridView1.Rows.Clear();
                this.dataGridView1.RowCount = recordCount;
            }

完整示例代码

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    
    namespace TreeGridViewTestOnly
    {
        public partial class Form1 : Form
        {
            public List<Person> personList = new List<Person>();
            public Form1()
            {
                InitializeComponent();
            }
    
            private void Form1_Load(object sender, EventArgs e)
            {
                //首先生成数据
                this.GenerateData();
                //然后生成列
                this.GenerateClo();
    
            }
            /// <summary>
            /// 生成数据
            /// </summary>
            private void GenerateData() {
                for (int i = 0; i < 100; i++)
                {
                    Person p1 = new Person() { Id = i, Password = "密码" + i, Level = 1 };
                    for (int j = 0; j < 10; j++)
                    {
                        Person p2 = new Person() { Id = j, Password = "密码" + j, Level = 2 };
                        for (int k = 0; k < 10; k++)
                        {
                            Person p3 = new Person() { Id = k, Password = "密码" + k, Level = 3 };
                            if (p2.ChildList == null)
                            {
                                p2.ChildList = new List<Person>();
                            }
                            p2.ChildList.Add(p3);
                        }
                        if (p1.ChildList == null)
                        {
                            p1.ChildList = new List<Person>();
                        }
                        p1.ChildList.Add(p2);
                    }
                    personList.Add(p1);
                }
            }
    
            /// <summary>
            /// 生成列
            /// </summary>
            private void GenerateClo()
            {
                this.dataGridView1.ReadOnly = true;
                this.dataGridView1.AllowUserToAddRows = false;
                this.dataGridView1.AllowUserToDeleteRows = false;
                this.dataGridView1.AllowUserToOrderColumns = false;
                this.dataGridView1.AllowUserToResizeRows = false;
                this.dataGridView1.AllowUserToResizeColumns = false;
    
                #region 影响性能
    
                this.dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
                this.dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
    
                this.dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
                this.dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
    
                #endregion
    
                this.dataGridView1.CellBorderStyle = DataGridViewCellBorderStyle.None;
                //this.dataGridView1.EditMode = DataGridViewEditMode.EditProgrammatically;
                this.dataGridView1.RowHeadersVisible = false;
                this.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    
                this.dataGridView1.VirtualMode = true;
    
                this.dataGridView1.CellValueNeeded -= dataGridView1_CellValueNeeded;
                this.dataGridView1.CellValueNeeded += dataGridView1_CellValueNeeded;
    
    
                this.dataGridView1.Columns.Clear();
    
                int colWidth = 100;
    
                DataGridViewImageColumn colImg = new DataGridViewImageColumn();
                colImg.HeaderText = String.Empty;
                colImg.Width = 20;
    
                DataGridViewTextBoxColumn colId = new DataGridViewTextBoxColumn();
                colId.Name = "colId";
                colId.HeaderText = "序号";
                colId.MinimumWidth = 160;
    
    
    
                DataGridViewTextBoxColumn colA = new DataGridViewTextBoxColumn();
                colA.HeaderText = "ID";
                colA.Width = colWidth;
    
                DataGridViewTextBoxColumn colB = new DataGridViewTextBoxColumn();
                colB.HeaderText = "密码";
                colB.Width = colWidth;
    
    
    
    
                this.dataGridView1.Columns.Add(colId);
                this.dataGridView1.Columns.Add(colA);
                this.dataGridView1.Columns.Add(colB);
    
    
                foreach (DataGridViewColumn col in this.dataGridView1.Columns)
                {
                    col.ReadOnly = true;
                }
    
                this.dataGridView1.CellMouseClick += dataGridView1_CellMouseClick;
            }
    
            private void dataGridView1_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e)
            {
                if (e.RowIndex >= this.dataGridView1.RowCount || e.RowIndex > this.personList.Count)
                {
                    return;
                }
                Random r = new Random();
                r.NextDouble();
                Person record = this.personList[e.RowIndex];
                object[] values = new object[] { record.Id, record.id, record.password };
                e.Value = values[e.ColumnIndex];
    
                if (e.ColumnIndex == 0)
                {
                    Person currRecord = this.personList[e.RowIndex];
                    if (currRecord.ChildList != null && currRecord.ChildList.Count > 0)
                    {
                        if (currRecord.IsExpanded)
                        {
                            e.Value = GenerateSpace(currRecord.Level) + "  [-]  " + values[e.ColumnIndex];
                        }
                        else
                        {
                            e.Value = GenerateSpace(currRecord.Level) + "  [+]  " + values[e.ColumnIndex];
                        }
                    }
                    else
                    {
                        e.Value = GenerateSpace(currRecord.Level + 1) + values[e.ColumnIndex];
                    }
                }
            }
    
            /// <summary>
            /// 根据节点级别生成要显示的空格数
            /// </summary>
            /// <param name="level"></param>
            /// <returns></returns>
            public string GenerateSpace(int level)
            {
                int step = 5;
                StringBuilder sb = new StringBuilder();
                for (int i = 0; i < step * (level - 1); i++)
                {
                    sb.Append(" ");
                }
                return sb.ToString();
            }
            void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
            {
                if (dataGridView1.Columns[e.ColumnIndex].Name == "colId")
                {
    
                    Console.WriteLine("MouseClick...");
                    if (this.personList[e.RowIndex].ChildList != null && this.personList[e.RowIndex].ChildList.Count > 0)
                    {
                        if (this.personList[e.RowIndex].IsExpanded)
                        {
                            //this.lst2.RemoveRange(e.RowIndex + 1, this.lst2[e.RowIndex].ChildList.Count);
                            this.RecursiveRemove(this.personList, e.RowIndex);
                            this.personList[e.RowIndex].IsExpanded = false;
                            this.ShowData(this.personList);
                        }
                        else
                        {
                            this.personList.InsertRange(e.RowIndex + 1, this.personList[e.RowIndex].ChildList);
                            this.personList[e.RowIndex].IsExpanded = true;
                            this.ShowData(this.personList);
                        }
    
                        this.dataGridView1.Rows[0].Selected = false;
                        this.dataGridView1.Rows[e.RowIndex].Selected = true;
                    }
                }
            }
    
            /// <summary>
            /// 递归移除
            /// </summary>
            /// <param name="lst"></param>
            /// <param name="index"></param>
            /// <param name="count"></param>
            public void RecursiveRemove(List<Person> lst, int index)
            {
                int count = GetAllExpandChildCount(lst[index]);
                lst.RemoveRange(index + 1, count);
            }
    
            public int GetAllExpandChildCount(Person r)
            {
                if (r.ChildList != null && r.ChildList.Count > 0)
                {
                    int cnt = 0;
                    if (r.IsExpanded)
                    {
                        cnt = r.ChildList.Count;
                        for (int i = 0; i < r.ChildList.Count; i++)
                        {
                            cnt += GetAllExpandChildCount(r.ChildList[i]);
                        }
                    }
    
                    r.IsExpanded = false;
                    return cnt;
                }
                else
                {
                    return 0;
                }
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                this.ShowData(this.personList);
            }
    
            public void ShowData(List<Person> lst)
            {
                int recordCount = lst.Count;
                this.dataGridView1.Rows.Clear();
                this.dataGridView1.RowCount = recordCount;
            }
        }
    }

[20190822135532361.gif]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/d63e25a0772a4ed6a692476bf42dd420.gif
[https_download.csdn.net_download_badao_liumang_qizhi_11593399]: https://download.csdn.net/download/badao_liumang_qizhi/11593399
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/be3e2f133887479d891cb5d62d65af89.jpg
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/d536a713b9f7430a9c4c8d10b977319d.jpg