Form1.cs

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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;
using System.Drawing.Printing;
namespace 记事本
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

       public string fname="";    //存储文件名
       public bool issave = false;   //是否存储
       public bool tchange = false;   //文件是否有变化

        private void Form1_Load(object sender, EventArgs e)
        {  
            //设置初始字体和文本
            comboBoxFontStyle.SelectedItem = "宋体";
            comboBoxFontSize.SelectedItem = "90";
            for(int i=30;i<300;){
                comboBoxFontSize.Items.Add(i);
                i += 10;
            }
        }
        //定义公共方法
        //打开文件
        private void open()
        {
            openFileDialog1.Title = "打开";
            openFileDialog1.FileName = "";
            openFileDialog1.Filter = "文本文件|*.txt";
            openFileDialog1.FilterIndex = 1;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                fname = openFileDialog1.FileName;
                richTextBox1.LoadFile(fname,RichTextBoxStreamType.PlainText);
                issave = false;
                tchange = false;
            }

        }

        //保存文件
        private void save()
        {
            if (fname == "")
            {
                saveFileDialog1.Title = "保存";
                this.saveFileDialog1.Filter = "文本文件|*.txt";
                if (this.saveFileDialog1.ShowDialog() == DialogResult.OK)
                {