11. 字体选择：
    直接调用控件python基础教程
    即可

   private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
    {
        //提示用户从本地计算机安装的字体中选择字体字号
        FontDialog fontDialog = new FontDialog();
        if (fontDialog.ShowDialog() == DialogResult.OK)
        {
            txtBox.Font = fontDialog.Font;
        }
    }

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在这里插入图片描述

12. 关于记事本： 新建一个窗口，根据自己的喜好添加标签及摆放位置

private void 关于记事本ToolStripMenuItem_Click(object sender, EventArgs e)
{
    //关于记事本说明
    Label lblTitle = new Label()
    {
        Text = "多功能记事本",
        Size = new Size(150, 25),
        Location = new Point(100, 50)
    };
    Label lblEdition = new Label()
    {
        Text = "版本号：个性测试版",
        Size = new Size(150, 25),
        Location = new Point(85, 100)
    };
    Label lblMail = new Label()
    {
        Text = "E-Mail：",
        Size = new Size(55, 25),
        Location = new Point(30, 180)
    };
    LinkLabel llblMail = new LinkLabel()
    {
        Text = "2417525822@qq.com",
        Size = new Size(110, 25),
        Location = new Point(85, 180)
    };
    Label lblCNDS = new Label()
    {
        Text = "CNDS博客：",
        Size = new Size(65, 25),
        Location = new Point(20, 220)
    };
    LinkLabel llblCNDS = new LinkLabel()
    {
        Text = "https://blog.csdn.net/UFO_Harold",
        Size = new Size(200, 25),
        Location = new Point(85, 220)
    };
    Form about = new Form
    {
        Text = "关于记事本",
        FormBorderStyle = FormBorderStyle.FixedSingle,
        MaximizeBox = false
    };

    llblCNDS.Click += new EventHandler(LlblCNDS_Click);
    about.Controls.Add(lblTitle);
    about.Controls.Add(lblEdition);
    about.Controls.Add(lblMail);
    about.Controls.Add(llblMail);
    about.Controls.Add(lblCNDS);
    about.Controls.Add(llblCNDS);
    about.Top = this.Top + this.Height / 2 - about.Height / 2;
    about.Left = this.Left + this.Width / 2 - about.Width / 2;
    about.StartPosition = FormStartPosition.CenterParent;
    about.ShowDialog();
}

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程序的关于记事本功能展c#教程示