C# 编写的文本文件读取程序

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using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

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

        private void button1_Click(object sender, EventArgs e)
        {
            FileStream fs = new FileStream("C://file.txt", FileMode.Open, FileAccess.Read);
            StreamReader m_streamReader = new StreamReader(fs);
            //使用StreamReader类来读取文件
            m_streamReader.BaseStream.Seek(0, SeekOrigin.Begin);
            // 从数据流中读取每一行，直到文件的最后一行，并在richTextBox1中显示出内容
            this.richTextBox1.Text = "";
            string strLine = m_streamReader.ReadLine();
            while (strLine != null)
            {
                this.richTextBox1.Text += strLine + "/n";
                strLine = m_streamReader.ReadLine();
            }
            //关闭此StreamReader对象
            m_streamReader.Close();

}

        private void button1_Click_1(object sender, EventArgs e)
        {
            FileStream fs = new FileStream("C://file.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter m_streamWriter = new StreamWriter(fs);

            // 清空文本文件
            StreamWriter sw = new StreamWriter(fs);
            sw.Write("");
            //使用StreamReader类来写文件
            m_streamWriter.Flush();
            m_streamWriter.BaseStream.Seek(0, SeekOrigin.Begin);
            // 写文件，并在richTextBox2中显示出内容
            m_streamWriter.WriteLine("This is the ");
            m_streamWriter.WriteLine("header for the file.");
            m_streamWriter.WriteLine("-------------------");

m_streamWriter.Flush();
m_streamWriter.Close();

            FileStream ws = new FileStream("C://file.txt", FileMode.Open, FileAccess.Read);
            StreamReader m_streamReader = new StreamReader(ws);
            //使用StreamReader类来读取文件
            m_streamReader.BaseStream.Seek(0, SeekOrigin.Begin);
            // 从数据流中读取每一行，直到文件的最后一行，并在richTextBox2中显示出内容
            this.richTextBox2.Text = "";
            string strLine = m_streamReader.ReadLine();
            while (strLine != null)
            {
                this.richTextBox2.Text += strLine + "/n";
                strLine = m_streamReader.ReadLine();
            }
            //关闭此StreamReader对象
            m_streamReader.Close();

        }

        }
}