C# xml显示到treeview及递归遍历、删除、添加节点（两层节点）

本文参考此文，且演示数据采用此文提供样例数据：

https://www.cnblogs.com/xiaoxiangfeizi/archive/2011/08/07/2120807.html

显示：

 public void btnAddRoot_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.IgnoreComments = true;                      //忽略文档里的注释
            XmlReader reader = XmlReader.Create("Info.xml", settings);
            xmlDoc.Load(reader);
            reader.Close();    
            XmlNode xn = xmlDoc.SelectSingleNode("bookstore");

            XmlNodeList lxn = xn.ChildNodes;
            foreach (XmlNode xn1 in lxn)
            {
                XmlElement xe = (XmlElement)xn1;
                TreeNode chdnode = new TreeNode();
                TreeNode sonnode1 = new TreeNode();
                TreeNode sonnode2 = new TreeNode();
                TreeNode sonnode3 = new TreeNode();
                TreeNode sonnode4 = new TreeNode();

                XmlNodeList xn2 = xe.ChildNodes;

                chdnode.Text = xn2.Item(0).InnerText;
                rootnode.Nodes.Add(chdnode);

                sonnode1.Text = "ISBN号："+xe.GetAttribute("ISBN").ToString();
                chdnode.Nodes.Add(sonnode1);

                sonnode2.Text = "书类："+xe.GetAttribute("Type").ToString();
                chdnode.Nodes.Add(sonnode2);

                sonnode3.Text = "作者："+xn2.Item(1).InnerText;
                chdnode.Nodes.Add(sonnode3);

                sonnode4.Text = "价格："+xn2.Item(2).InnerText;
                chdnode.Nodes.Add(sonnode4);
            }
            this.tvTest.Nodes.Add(rootnode);
            tvTest.Nodes[0].Expand();

删除选中节点：

 private void btnDelNode_Click(object sender, EventArgs e)
        {
            TreeNode treeNode = tvTest.SelectedNode;            
            if (MessageBox.Show("确定删除？", "确认删除", MessageBoxButtons.OKCancel) == DialogResult.OK)
            {
                treeNode.Remove();
            }             
        }

遍历所有节点：

        private List<TreeNode> nodeList = new List<TreeNode>();
        private void TraverseNode(TreeNode node)
        {
            nodeList.Add(node);
            for (int i = 0; i < node.Nodes.Count; i++)
            {
                TraverseNode(node.Nodes[i]);
            }
        }

        private void btnSearch_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < tvTest.Nodes.Count; i++)
            {
                TraverseNode(tvTest.Nodes[i]);
            }
            for (int j = 0; j < nodeList.Count; j++)
            {
                MessageBox.Show(nodeList[j].Text, null, MessageBoxButtons.OKCancel);
            }
        }

添加节点（与另一个窗体联动），采用委托方法：

子窗体代码：

namespace WindowsFormsApplication
{
    public delegate void ChangeTextHandler(string str1, string str2, string str3, string str4, string str5);
    public partial class Form2 : Form
    {
        public static Form2 form2;
      
        public Form2()
        {
            InitializeComponent();
            form2 = this;
        }

        public event ChangeTextHandler ChangeText;
        private void button1_Click(object sender, EventArgs e)
        {
             ChangeText(textBox1.Text, textBox2.Text, comboBox1.Text, textBox3.Text, textBox4.Text);
             this.Close();
        }       
    }
}

添加信息窗体：

主窗体代码：

 　　　　private void btnAddNode_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            f2.ChangeText += new ChangeTextHandler(Change_Text);
            f2.Show();
        }
        public void Change_Text(string str1, string str2, string str3, string str4, string str5)
        {
            TreeNode chdnode = new TreeNode();
            TreeNode sonnode1 = new TreeNode();
            TreeNode sonnode2 = new TreeNode();
            TreeNode sonnode3 = new TreeNode();
            TreeNode sonnode4 = new TreeNode();
            chdnode.Text  = str1;
            sonnode1.Text = "ISBN号：" + str2;
            sonnode2.Text = "书类：" + str3;
            sonnode3.Text = "作者：" + str4;
            sonnode4.Text = "价格：" + str5;
            rootnode.Nodes.Add(chdnode);
            chdnode.Nodes.Add(sonnode1);
            chdnode.Nodes.Add(sonnode2);
            chdnode.Nodes.Add(sonnode3);
            chdnode.Nodes.Add(sonnode4);
        }