以下是检查和取消选中子节点和父节点的树视图示例的工作代码(添加树视图并将名称指定为 tvwDynamic)
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;
命名空间 Treeview { public 部分类 Form1 : Form { public Form1() { InitializeComponent(); }
private void Form1_Load(object sender, EventArgs e)
{
TreeNode MainNode = new TreeNode("Java");
tvwDynamic.Nodes.Add(MainNode);
MainNode = new TreeNode("PHP");
tvwDynamic.Nodes.Add(MainNode);
TreeNode node2 = new TreeNode("C#");
TreeNode node3 = new TreeNode("VB.NET");
TreeNode[] childNodes = new TreeNode[] {node2,node3};
MainNode = new TreeNode("ASP.NET", childNodes);
tvwDynamic.Nodes.Add(MainNode);
TreeNode node4 = new TreeNode("Winforms");
TreeNode node5 = new TreeNode("Webforms");
TreeNode[] SubchildNodes = new TreeNode[] {node4,node5};
MainNode = new TreeNode("Test",SubchildNodes);
tvwDynamic.Nodes[2].Nodes[1].Nodes.Add(MainNode);
tvwDynamic.CheckBoxes = true;
}
private void tvwDynamic_AfterCheck(object sender, TreeViewEventArgs e)
{
if (e.Action != TreeViewAction.Unknown)
{
if (e.Node.Nodes.Count > 0)
{
/* Calls the CheckAllChildNodes method, passing in the current
Checked value of the TreeNode whose checked state changed. */
this.CheckAllChildNodes(e.Node, e.Node.Checked);
}
}
SelectParents(e.Node, e.Node.Checked);
}
private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
{
foreach (TreeNode node in treeNode.Nodes)
{
node.Checked = nodeChecked;
if (node.Nodes.Count > 0)
{
// If the current node has child nodes, call the CheckAllChildsNodes method recursively.
this.CheckAllChildNodes(node, nodeChecked);
}
}
}
private void SelectParents(TreeNode node, Boolean isChecked)
{
var parent = node.Parent;
if (parent == null)
return;
if (!isChecked && HasCheckedNode(parent))
return;
parent.Checked = isChecked;
SelectParents(parent, isChecked);
}
private bool HasCheckedNode(TreeNode node)
{
return node.Nodes.Cast<TreeNode>().Any(n => n.Checked);
}
} }