记事本/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.IO;
using System.Drawing.Printing;
// 下载于www.51aspx.com
namespace 记事本
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
           
        }
        public static string str = "";
        
        //打开文件
        private void 打开OToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog openfile = new OpenFileDialog();//初始化
            openfile.Filter = "txt文件(*.txt)|*.txt";//文件类型过滤
            Stream mystream = null;
            if (openfile.ShowDialog() == DialogResult.OK)
            {
                try//异常处理
                {
                    if ((mystream = openfile.OpenFile()) != null)
                    {
                        StreamReader sr = new StreamReader(mystream);
                        string str = sr.ReadLine();//一行一行的读取
                        while (str != null)//只要该行不为空
                        {
                            richTextBox1.AppendText(str);//将文本添加到控件中去
                            richTextBox1.AppendText("\n");//读取一行后换行
                            str = sr.ReadLine();//读取下一行
                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("文件打开出错"+ex.Message);
                }
            }
        }

        private void 新建NToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openfile = new OpenFileDialog();
            openfile.Filter = "txt文件(*.txt)|*.txt";