namespace _18记事本应用程序
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

成都创新互联长期为近千家客户提供的网站建设服务，团队从业经验10年，关注不同地域、不同群体，并针对不同对象提供差异化的产品和服务；打造开放共赢平台，与合作伙伴共同营造健康的互联网生态环境。为东平企业提供专业的成都网站制作、成都网站设计，东平网站改版等技术服务。拥有10余年丰富建站经验和众多成功案例,为您定制开发。

    private void Form1_Load(object sender, EventArgs e)
    {
        //加载程序的时候隐藏panel
        panel1.Visible = false;
        //取消文本框自动换行
        textBox1.WordWrap = false;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //点击按钮时也将panel隐藏
        panel1.Visible = false;
    }

    private void 显示ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        //点击显示按钮时显示panel
        panel1.Visible = true;
    }

    private void 隐藏ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        //点击隐藏按钮时隐藏panel
        panel1.Visible = false;
    }
    //获得打开文件的全路径
    List list = new List();
    private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        //打开对话框
        OpenFileDialog ofd = new OpenFileDialog();
        ofd.Title = "请选择要打开的文件";
        ofd.InitialDirectory = @"C:\Users\Administrator.USER-20180925HC\Desktop\pic";
        ofd.Multiselect = true;
        ofd.Filter = "文本文件|*.txt|所有文件|*.*";
        //显示打开对话框
        ofd.ShowDialog();

        //将选中打开的txt文件展现在textBox中
        //获得文件的全路径
        string path = ofd.FileName;
        //添加全路径到list集合中
        list.Add(path);
        //获得用户打开的文件名
        string fileName = Path.GetFileName(path);
        //将文件名赋值给listBox
        listBox1.Items.Add(fileName);
        //判断路径是否为空
        if (path == "")
        {
            return;
        }
        //如果路径不为空
        using (FileStream fsRead = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
        {
            //读到字节数组当中
            byte[] buffer = new byte[1024 * 1024 * 5];
            //调用读取的方法
            int r = fsRead.Read(buffer, 0, buffer.Length);
            //开始解码，解码后赋值给textBox
            textBox1.Text = Encoding.Default.GetString(buffer,0, r);
        }

    }

    private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        //保存对话框
        SaveFileDialog sfd = new SaveFileDialog();
        sfd.Title = "请选择保存路径";
        sfd.InitialDirectory = @"C:\Users\Administrator.USER-20180925HC\Desktop\pic";
        sfd.Filter = "文本文件|*.txt|所有文件|*.*";
        sfd.ShowDialog();

        //获得文件要保存的路径
        string path = sfd.FileName;
        //判断路径是否为空
        if (path == "")
        {
            return;
        }
        //不为空则开始解码
        using(FileStream fsWrite=new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
        {
            byte[] buffer = Encoding.Default.GetBytes(textBox1.Text);
            fsWrite.Write(buffer, 0, buffer.Length);
        }
        MessageBox.Show("保存成功");
    }

    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";
        }
    }

    private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        FontDialog fd = new FontDialog();
        fd.ShowDialog();
        textBox1.Font = fd.Font;
    }

    private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ColorDialog cd = new ColorDialog();
        cd.ShowDialog();
        textBox1.ForeColor = cd.Color;
    }

    private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }

    private void listBox1_DoubleClick(object sender, EventArgs e)
    {
               //双击listBox文件列表文件名，则在textBox显示文件信息
        //获得双击文件的全路径
        string path = list[listBox1.SelectedIndex];
        using (FileStream fsRead = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
        {
            byte[] buffer = new byte[1024 * 1024 * 5];
            int r = fsRead.Read(buffer, 0, buffer.Length);

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

    }
}

}

网站题目：18.WinForm练习--记事本应用程序
链接地址：http://chengdu.cdxwcx.cn/article/jjdpoj.html