Read.cs

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

namespace 图书管理系统
{
    public partial class Read : Form
    {
        public Read()
        {
            InitializeComponent();
        }

        private void Read_Load(object sender, EventArgs e)
        {

        }

        private void btnRead_Click(object sender, EventArgs e)
        {
            try
            {
                FileStream fs = new FileStream("Msg.txt", FileMode.Open, FileAccess.Read);
                StreamReader sr = new StreamReader(fs);
                tbMsg.Text = sr.ReadToEnd();
                sr.Close();
                fs.Close();
                MessageBox.Show("读取成功！");
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            tbMsg.Text = "";
            try
            {
                FileStream fs = File.OpenWrite("Msg.txt");
                fs.SetLength(0);
                fs.Close();
                MessageBox.Show("清空成功！");
            }
            catch(IOException ex)
            {
                MessageBox.Show(ex.Message);
            }