窗体事件的处理程序

here I'll just show some simple examples……



create a 窗体应用程序：



then write its code:



（为treeview 添加子节点）

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 test1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
   //         result.DialogResult = DialogResult.Yes;
        }

        private void result_Click(object sender, EventArgs e)
        {
     /*   double i = double.Parse(add1.Text) + double.Parse(add2.Text);
           res.Text = i.ToString();*/            
           
            res.Text= Convert.ToString( Convert.ToDouble(add1.Text) + Convert.ToDouble(add2.Text));
            //以上两种写法都可以实现相加
           Close();
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            MessageBox.Show("YES!");
        }

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
        }

        private void Add_Click(object sender, EventArgs e)
        {
            //node.Text
            /*
            TreeNode mynode = new TreeNode(node.Text);
            treeView1.Nodes.Add(mynode);
             * */

            //  treeView1.Nodes[treeView1.SelectedNode.Index].Nodes.Add(node.Text);   
            //treeView1.SelectedNode.Index只判断当前层的几号节点，不会判断选中的是第几层
            //也就是说只能给最外层的root添加节点

            //MessageBox.Show(treeView1.SelectedNode.Nodes.Count.ToString());
            //表示一个节点的child个数

            //MessageBox.Show(treeView1.GetNodeCount(true).ToString());
            //return the number of nodes all

             treeView1.SelectedNode.Nodes.Add(node.Text);
            //能给任一root或child添加子节点
        }

        private void Click_Node(object sender, TreeNodeMouseClickEventArgs e)
        {
            
        }
    }
}

其中treeview的用法值得记录！