今天练习了一个动态添加更新树的例子，具体实现如下：新建Form应用程序，添加treeview,textbox,以及四个button控件：
具体代码如下：
private void button1_Click(object sender, EventArgs e)
{
TreeNode newNode = new TreeNode(this.textBox1.Text,0,0); this.treeView1.Nodes.Add(newNode); this.treeView1.Select();
} private void button2_Click(object sender, EventArgs e) { TreeNode selectedNode = this.treeView1.SelectedNode; if(selectedNode == null)
{
MessageBox.Show(this,"添加子结点之前必须先选中一个根节点。","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning); return; 
} TreeNode newNode = new TreeNode(this.textBox1.Text,1,1); selectedNode.Nodes.Add(newNode); selectedNode.SelectedImageIndex = 1; selectedNode.Expand(); this.treeView1.Select(); } private void button3_Click(object sender, EventArgs e) { TreeNode selectedNode = this.treeView1.SelectedNode; if(selectedNode == null) { MessageBox.Show(this,"删除结点之前必须选中一个结点.","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning); return; } TreeNode parentNode = selectedNode.Parent; if (parentNode == null) { this.treeView1.Nodes.Remove(selectedNode); } else { parentNode.Nodes.Remove(selectedNode); if(parentNode.Nodes.Count == 0) { parentNode.ImageIndex = 1; parentNode.SelectedImageIndex = 1; } } this.treeView1.Select(); } private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { int str = treeView1.SelectedImageIndex; //listBox1.Items.Add(str.ToString()); } private void button4_Click(object sender, EventArgs e) { TreeNode selectNode = this.treeView1.SelectedNode; if(selectNode != null) { this.treeView1.SelectedNode.Text = textBox1.Text; } } }