利用C#实现记事本的功能的示例代码

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;
 
namespace NoteBook45
{
    public partial class Form1 : Form
    {
        bool isFirstSave = true;
        public Form1()
        {
            InitializeComponent();
        }
 
        private void 新建ToolStripMenuItem_Click(object sender, EventArgs e)//暴力新建
        {
            rtxtEdit.Clear();
            this.Text = "无标题-我的记事本";
        }
 
        private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
 
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "无标题-我的记事本";
            rtxtEdit.WordWrap = false;
            自动换行ToolStripMenuItem.CheckOnClick = true;
        }
 
        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)//暴力退出
        {
            Application.Exit();
        }
 
        private void 撤销ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            rtxtEdit.Undo();
        }
 
        private void 复制ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (rtxtEdit.SelectedText != "")
                rtxtEdit.Copy();
            else
                MessageBox.Show("没有选中任何内容,无法进行复制!");
        }
 
        private void 粘贴ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            rtxtEdit.Paste();
        }
 
        private void 剪切ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (rtxtEdit.SelectedText != "")
                rtxtEdit.Cut();
            else
                MessageBox.Show("没有选择任何内容,无法进行剪切!");
        }
 
        private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
        {
 
        }
 
        private void 复制ToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            复制ToolStripMenuItem_Click(sender, e);
        }
 
        private void 粘贴ToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            粘贴ToolStripMenuItem_Click(sender, e);
        }
 
        private void 剪切ToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            剪切ToolStripMenuItem_Click(sender, e);
        }
 
        private void toolStripButton新建_Click(object sender, EventArgs e)
        {
            新建ToolStripMenuItem_Click(sender, e);
        }
 
        private void toolStripButton打开_Click(object sender, EventArgs e)
        {
 
        }
 
        private void toolStripButton保存_Click(object sender, EventArgs e)
        {
 
        }
 
        private void toolStripButton复制_Click(object sender, EventArgs e)
        {
            复制ToolStripMenuItem_Click(sender, e);
        }
 
        private void toolStripButton粘贴_Click(object sender, EventArgs e)
        {
            粘贴ToolStripMenuItem_Click(sender, e);
        }
 
        private void toolStripButton剪切_Click(object sender, EventArgs e)
        {
            剪切ToolStripMenuItem_Click(sender, e);
        }
 
        private void toolStripButton撤销_Click(object sender, EventArgs e)
        {
            撤销ToolStripMenuItem_Click(sender, e);
        }
 
        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)//暴力打开
        {
            openFileDialog1.InitialDirectory=@"C:\";//设置打开文件对话框的初始目录
            openFileDialog1.Filter = "文本文件(*.txt)|*.TXT";//设置打开文件对话框可以显示的文件类型
            openFileDialog1.FileName = "";
            openFileDialog1.ShowDialog();//显示打开文件对话框
            string filename = openFileDialog1.FileName;//获取用户选择的要打开的文件的全路径
            if (filename == "")
                MessageBox.Show("没有选中要打开的文件!");
            else
            {
                rtxtEdit.LoadFile(filename, RichTextBoxStreamType.PlainText);//以纯文本的形式,将文件内容加载进富文本框
                //c:\my documents\1.txt
                int index = filename.LastIndexOf(@"\");//求最后一个反斜杠在文件名中的位置
                filename = filename.Substring(index + 1);//求文件名的主文件名和扩展名
                this.Text = filename + "我的记事本";
            }
 
        }
 
        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (isFirstSave)
 {
     另存为ToolStripMenuItem_Click(sender, e);
         isFirstSave = false;
     }
 else
     rtxtEdit.SaveFile(saveFileDialog1.FileName, RichTextBoxStreamType.PlainText);
        }
 
        private void 另存为ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            saveFileDialog1.InitialDirectory = @"c:\";
            saveFileDialog1.Filter = "文本文件(*.txt)|*.TXT";
            saveFileDialog1.FileName = "";
            string filename = "";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                filename = saveFileDialog1.FileName;
                rtxtEdit.SaveFile(filename, RichTextBoxStreamType.PlainText);
                int index = filename.LastIndexOf(@"\");//求最后一个反斜杠在文件名中的位置
                filename = filename.Substring(index + 1);//求文件名的主文件名和扩展名
                this.Text = filename + "我的记事本";
            }
        }
 
        private void 自动换行ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (自动换行ToolStripMenuItem.Checked)
                rtxtEdit.WordWrap = true;
            else
                rtxtEdit.WordWrap = false;
        }
 
        private void rtxtEdit_TextChanged(object sender, EventArgs e)
        {
 
        }
    }
}