一：实现功能，获得选中节点，在选中节点下添加节点，折叠，展开，删除，得到选中节点下checked项，选中根节点其下节点也选中，图标。上图
二：相关代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace TreeView
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
/// <summary>
/// 事件:获得选中节点的文本
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_nodeText_Click(object sender, EventArgs e)
{
treeView1.HideSelection = false;//将选中的节点显示为选中的状态,默认是隐藏显示状态
MessageBox.Show(treeView1.SelectedNode.Text);//nodes是节点的集合,每个分支是一个节点}
/// <summary>
/// 事件:添加节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_addNode_Click(object sender, EventArgs e)
{
//treeView1.Nodes.Add("红马車");//在根节点添加
//MessageBox.Show(treeView1.Nodes.Count.ToString());//得到根节点的数量
//treeView1.Nodes[0].Nodes[0].Nodes.Add("红马車");//在根节点的第0根节点下的第0子节点下添加
//treeView1.Nodes[2].Nodes.Add("红马車");//在第2根节点下添加
if (treeView1.SelectedNode != null)//是否被选中
{
treeView1.SelectedNode.Nodes.Add(tb_nodeText.Text);//在选中的子节点下添加
treeView1.ExpandAll();//自动展开所有的项
}}
/// <summary>
/// 事件:自动载入
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Form1_Load(object sender, EventArgs e)
{
treeView1.HideSelection = false;//显示选中的阴影
treeView1.ExpandAll();//自动展开所有的项
treeView1.CheckBoxes = true;//显示选中框
treeView1.Nodes[0].Nodes[1].SelectedImageIndex = 3;
treeView1.Nodes[0].Nodes[1].ImageIndex = 2;
}
/// <summary>
/// 事件:展开全部节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_ExpandAll_Click(object sender, EventArgs e)
{
treeView1.ExpandAll();}
/// <summary>
/// 事件:折叠全部
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_CollapseAll_Click(object sender, EventArgs e)
{
treeView1.CollapseAll();}
/// <summary>
/// 事件:展开当前选中的同级子节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_expandNow_Click(object sender, EventArgs e)
{
if (treeView1.SelectedNode != null)
{
treeView1.SelectedNode.Expand();
//treeView1.SelectedNode.ExpandAll();//展开当前选中的所有的子节点
}
}
/// <summary>
/// 事件:折叠当前同级节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_CollapseNow_Click(object sender, EventArgs e)
{
if (treeView1.SelectedNode != null)
{
treeView1.SelectedNode.Collapse();
}
}
/// <summary>
/// 事件:删除节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_nodeDelete_Click(object sender, EventArgs e)
{
//treeView1.Nodes[0].Remove();//删除根节点的第0节点
treeView1.Nodes[0].Nodes[0].Remove();//第0个根节点下的第0个节点
}
/// <summary>
/// 事件:删除选中的节点
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_deleteSelectNode_Click(object sender, EventArgs e)
{
if (treeView1.SelectedNode != null)
{
treeView1.SelectedNode.Remove();
}
}
/// <summary>
/// 事件:查看选中节点选中的同级项
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_showChecked_Click(object sender, EventArgs e)
{
string str = "选中了:";
if (treeView1.SelectedNode != null)
{
foreach (TreeNode tn in treeView1.SelectedNode.Nodes)
{
if (tn.Checked == true)
{
str += tn.Text;
}
}
MessageBox.Show(str);
}
}
/// <summary>
/// 事件:选中根节点该节点的子节点也选中
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)//只要有选中就会触发
{
foreach (TreeNode tn in e.Node.Nodes)
{
tn.Checked = e.Node.Checked;//根节点的选中状态给子节点
}
}
}
}
winform学习日志（二十六）----------控件treeview使用,布布扣,bubuko.com