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C# 常用控件（学习笔记8）

news 2026/6/17 1:14:58

1. TreeView 树形控件

/// <summary>
/// 添加
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnTreeAdd_Click(object sender, EventArgs e)
{treeView1.Nodes.Clear();TreeNode root = new TreeNode{Text = "Root",Tag = "0"};root.Nodes.Add(new TreeNode{Text = "节点1",Tag = "1"});root.Nodes.Add(new TreeNode{Text = "节点2",Tag = "2"});root.Nodes.Add(new TreeNode{Text = "节点3",Tag = "3"});root.Nodes[1].Nodes.Add(new TreeNode{Text = "节点21",Tag = "21"});root.Nodes[1].Nodes.Add(new TreeNode{Text = "节点22",Tag = "22"});treeView1.Nodes.Add(root);treeView1.ExpandAll();
}/// <summary>
/// 选中
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnTreeSelect_Click(object sender, EventArgs e)
{if (treeView1.SelectedNode != null){MessageBox.Show(treeView1.SelectedNode.Text + " " + treeView1.SelectedNode.Tag);}}/// <summary>
/// 编辑
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnTreeEdit_Click(object sender, EventArgs e)
{if (treeView1.Nodes.Count > 0 && treeView1.Nodes[0].Nodes.Count > 2){treeView1.Nodes[0].Nodes[2].Text = "节点3，改变一下！";}
}/// <summary>
/// 删除
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnTreeDelete_Click(object sender, EventArgs e)
{if (treeView1.Nodes.Count > 0 && treeView1.Nodes[0].Nodes.Count > 1 && treeView1.Nodes[0].Nodes[1].Nodes.Count > 1){treeView1.Nodes[0].Nodes[1].Nodes[1].Remove();}
}