Winform基础：简单记事本

using System;
using System.Collections.Generic; 
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace _118_记事本应用程序
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //加载程序的时候隐藏panel
            panel1.Visible = false;
            //取消文本框的自动换行
            textBox1.WordWrap = false;
        }
        /// <summary>
        /// 点击按钮的时候，隐藏panel
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            panel1.Visible = false;
        }
        private void 显示ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            panel1.Visible = true;
        }
        private void 隐藏ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            panel1.Visible = false;
        }
        List<string> list = new List<string>();
        /// <summary>
        /// 打开对话框
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            //设置对话框标题
            ofd.Title = "客官，请选择要打开的文件";
            //设置对话框可以多选
            ofd.Multiselect = true;
            //设置对话框的初始目录
            ofd.InitialDirectory = @"C:\Users\46124\Desktop";
            //设置对话框可筛选的文件类型的内容
            ofd.Filter = "文本文件|*.txt|所有文件|*.*";
            ofd.ShowDialog();
            //获得在打开对话框中选中的路径
            string path = ofd.FileName;
            //将文件的全路径存储到泛型集合中
            list.Add(path);
            //获得了用户打开的文件名
            string fileName = Path.GetFileName(path);
            //将文件名放入listBox中
            listBox1.Items.Add(fileName);
            ReadFile(path);
            //MessageBox.Show("打开成功");
        }
        /// <summary>
        /// 保存用户在textBox中写入的内容
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Title = "客官，请选择你要保存的路径~";
            //设置对话框可筛选的文件类型的内容
            sfd.Filter = "文本文件|*.txt|所有文件|*.*";
            sfd.InitialDirectory = @"C:\Users\46124\Desktop";
            sfd.ShowDialog();
            //设置对话框的初始目录
            //获取用户要保存文件的路径
            string path = sfd.FileName;
            WriteFile(path);
            MessageBox.Show("保存成功");
        }
        /// <summary>
        /// 用户点击后换行，再次点击取消换行
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 自动换行ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (自动换行ToolStripMenuItem.Text == "☆自动换行")
            {
                textBox1.WordWrap = true;
                自动换行ToolStripMenuItem.Text = "★取消自动换行";
            }
            else if (自动换行ToolStripMenuItem.Text == "★取消自动换行")
            {
                textBox1.WordWrap = false;
                自动换行ToolStripMenuItem.Text = "☆自动换行";
            }
        }
        /// <summary>
        /// 换字体样式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FontDialog fd = new FontDialog();
            fd.ShowDialog();
            textBox1.Font = fd.Font;
        }
        /// <summary>
        /// 更改背景色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ColorDialog cd = new ColorDialog();
            cd.ShowDialog();
            textBox1.BackColor = cd.Color;
        }
        /// <summary>
        /// 双击历史记录打开文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void listBox1_DoubleClick(object sender, EventArgs e)
        {
            //获得双击文件所对应的全路径
            string path = list[listBox1.SelectedIndex];
            ReadFile(path);
        }
        /// <summary>
        /// 读取文件
        /// </summary>
        /// <param name="path"></param>
        public void ReadFile(string path)
        {
            //如果路径为空，则立即跳出函数
            if (path == "")
            {
                return;
            }
            using (FileStream fsRead = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
            {
                byte[] buffer = new byte[1024 * 1024 * 5];
                int readbyte = fsRead.Read(buffer, 0, buffer.Length);
                textBox1.Text = Encoding.UTF8.GetString(buffer, 0, readbyte);
            }
        }
        /// <summary>
        /// 写入文件
        /// </summary>
        /// <param name="path"></param>
        public void WriteFile(string path)
        {
            //如果路径为空，则立即跳出函数
            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);
            }
        }
    }
}