简易记事本---C#窗体

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

namespace xiezhiban
{
    public partial class Form1 : Form
    {
        string s;
        public Form1()
        {
            InitializeComponent();
        }
        private void 复制ToolStripMenuItem_Click(object sender, EventArgs e)
        {
        s = this.richTextBox1.SelectedText;
        }

        private void 剪切ToolStripMenuItem_Click(object sender, EventArgs e)
        {
         s = this.richTextBox1.SelectedText;
         this.richTextBox1.SelectedText = "";
        }

        private void 粘贴ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.richTextBox1.SelectedText += s;
        }

        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd =new OpenFileDialog();
            ofd.Filter = "text|*.Txt|rtf|*.rtf";
             ofd.Multiselect = false;
             ofd.ShowDialog();
             string fn = ofd.FileName;
             if (fn != "")
             {
                 this.richTextBox1.LoadFile(fn,RichTextBoxStreamType.PlainText);
             }

        }

        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd =new SaveFileDialog();
            sfd.Filter = "text|*.Txt|rtf|*.rtf";
             sfd.ShowDialog();
             string fn = sfd.FileName;
             if (fn != "")
             {
                 this.richTextBox1.SaveFile(fn,RichTextBoxStreamType.PlainText);
             }
        }

        private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FontDialog zt = new FontDialog();
            zt.Font=richTextBox1.SelectionFont;
            if (zt.ShowDialog() == DialogResult.OK)
                richTextBox1.SelectionFont = zt.Font;
        }

        private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ColorDialog afo = new ColorDialog();
            afo.Color= richTextBox1.SelectionColor;
             if (afo.ShowDialog() == DialogResult.OK)
                richTextBox1.SelectionColor = afo.Color;

        }

        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.richTextBox1.SelectedText = "";
        }

        private void 时间日期ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.richTextBox1.SelectedText += DateTime.Now.ToString();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.label1.Text = DateTime.Now.ToString();
        }
        }
    }