场景
效果
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：
其中DataGridView点击右上角新增列，然后添加两列。
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;
}
}
}
