using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Threading.Tasks;using System.Windows.Forms;using System.IO;using System.Text;namespace 对话框{    public partial class Form2 : Form    {        public Form2()        {            InitializeComponent();        }        #region 读取数据        private void button2_Click(object sender, EventArgs e)        {            //显示工具            DialogResult dr = openFileDialog1.ShowDialog();            //取值            if (dr == DialogResult.OK)            {                //文件路径                string path = openFileDialog1.FileName;                //文件流                FileStream fs = new FileStream(path,FileMode.Open,FileAccess.Read);                //读取                byte[] sj=new byte[fs.Length]; //造一个二进制数组，用来存储读到的数据                                fs.Read(sj,0,sj.Length); //将文件读取为二进制数据，并且放到二进制数组里边                //将二进制数据转为字符串                richTextBox1.Text = Encoding.Default.GetString(sj);                //关闭流                fs.Close();            }        }        #endregion        #region 写入数据        private void button1_Click(object sender, EventArgs e)        {            //显示选择文件对话框            DialogResult dr=saveFileDialog1.ShowDialog();                        //获取路径            if (dr == DialogResult.OK)            {                string path = saveFileDialog1.FileName;   //文件路径                string nr = richTextBox1.Text; //取出文本框中的内容                byte[] sj = Encoding.Default.GetBytes(nr);  //将字符串转为二进制数组                //造文件流                FileStream fs = new FileStream(path,FileMode.Create);                //向文件里边写数据                fs.Write(sj,0,sj.Length);                //关闭流                fs.Close();            }        }        #endregion    }}