对话框

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

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

        private void button1_Click(object sender, EventArgs e)
        {
            //点击弹出对话框
            OpenFileDialog ofd = new OpenFileDialog();
            //设置对话框标题
            ofd.Title = "请选择要打开的文本文件";
            //设置对话框可以多选
            ofd.Multiselect = true;
            //设置对话框的初始目录
            ofd.InitialDirectory = @"F:\程序学习";
            //设置对话框的文件类型
            ofd.Filter = "文本文件|*.txt*|媒体文件|*.mp3|图片文件|*.jpg|所有文件|*.*";
            //展示对话框
            ofd.ShowDialog();
            //获得在打开对话框中选中文件的路径
            string path = ofd.FileName;
            if(path=="")
            {
                return;
            }
            using(FileStream fsRead=new FileStream (path,FileMode.OpenOrCreate,FileAccess.Read))
            {
                byte[] buffer = new byte[1024 * 1024 * 5];
                //实际读取到的字节数
                int r = fsRead.Read(buffer, 0, buffer.Length);

                textBox1.Text = Encoding.UTF8 .GetString(buffer, 0, r);
            }


        }

        private void button2_Click(object sender, EventArgs e)
        {
            SaveFileDialog save = new SaveFileDialog();
            save.Title = "保存文件";
            save.InitialDirectory = @"F:\程序学习";
            save.Filter = "文本文件|*.txt";
            save.ShowDialog();
            //拿到要保存文件的路径
            string path = save.FileName;
            if (path == "")
            {
                return;
            }
            using (FileStream fsWrite = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
            {
                byte[] buffer = Encoding.UTF8.GetBytes(textBox1.Text);
                fsWrite.Write(buffer, 0, buffer.Length);

            }
            MessageBox.Show("保存成功");

        }
    }
}

 

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

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

        private void button1_Click(object sender, EventArgs e)
        {
            //点击弹出对话框
            OpenFileDialog ofd = new OpenFileDialog();
            //设置对话框标题
            ofd.Title = "请选择要打开的文本文件";
            //设置对话框可以多选
            ofd.Multiselect = true;
            //设置对话框的初始目录
            ofd.InitialDirectory = @"F:\程序学习";
            //设置对话框的文件类型
            ofd.Filter = "文本文件|*.txt*|媒体文件|*.mp3|图片文件|*.jpg|所有文件|*.*";
            //展示对话框
            ofd.ShowDialog();
            //获得在打开对话框中选中文件的路径
            string path = ofd.FileName;
            if(path=="")
            {
                return;
            }
            using(FileStream fsRead=new FileStream (path,FileMode.OpenOrCreate,FileAccess.Read))
            {
                byte[] buffer = new byte[1024 * 1024 * 5];
                //实际读取到的字节数
                int r = fsRead.Read(buffer, 0, buffer.Length);

                textBox1.Text = Encoding.UTF8 .GetString(buffer, 0, r);
            }


        }
    }
}