菜单事件的响应(RichTextBox字体加粗、斜体、下划线)

范例说明

本范例是在前一例的基础上创建各个菜单项的响应事件，使用户单击菜单项时能执行相应的操作，程序运行效果如图：

关键步骤

1. 创建一个新的Windows应用程序.
2. 把MenuStript和RichTextBox控件拖放到设计界面上,并设置相应菜单项和Name属性.
3. 把RichTextBox的Dock属性修改为”Fill”.
4. 双击各个菜单项，会出现代码界面，添加相应的功能代码.

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

namespace Demo1_3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 打开文件菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsmiOpenFile_Click(object sender, EventArgs e)
        {
            try
            {
                OpenFileDialog ofdOpenFile = new OpenFileDialog();
                //对话框标题
                ofdOpenFile.Title = "打开文件";
                //设置打开文件类型
                ofdOpenFile.Filter = "TextDocument(*.rtf)|*.rtf";
                if (ofdOpenFile.ShowDialog() == DialogResult.OK)
                {
                    //文本框显示打开文件的内容
                    this.rtbShow.LoadFile(ofdOpenFile.FileName, RichTextBoxStreamType.PlainText);
                    this.Text = ofdOpenFile.FileName;
                }
            }
            catch (IOException exp)
            {
                MessageBox.Show(exp.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        /// <summary>
        /// 保存文件菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsmiSaveFile_Click(object sender, EventArgs e)
        {
            try
            {
                SaveFileDialog sfdSaveFile = new SaveFileDialog();
                sfdSaveFile.Title = "保存文件";
                sfdSaveFile.Filter = "TextDocument(*.rtf)|*.rtf";
                if (sfdSaveFile.ShowDialog() == DialogResult.OK)
                {
                    this.rtbShow.SaveFile(sfdSaveFile.FileName, RichTextBoxStreamType.PlainText);
                }
            }
            catch (IOException exp)
            {
                MessageBox.Show(exp.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        /// <summary>
        /// 文字加粗菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsmiBold_Click(object sender, EventArgs e)
        {
            //获取当前选中文字的格式(字体、字号、字形等)
            Font oldFont = this.rtbShow.SelectionFont;
            Font newFont;
            //判断当前选中文字是否已加粗
            if (oldFont.Bold)
            {
                //如果选中文字已加粗则取消加粗
                newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Bold);
            }
            else
            {
                //如果选中文字未加粗则直接加粗
                newFont = new Font(oldFont, oldFont.Style | FontStyle.Bold);
            }
            this.rtbShow.SelectionFont = newFont;     //设置选中文字格式为新的格式
        }

        /// <summary>
        /// 文字斜体菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsmiItalic_Click(object sender, EventArgs e)
        {
            Font oldFont = this.rtbShow.SelectionFont;
            Font newFont;
            if (oldFont.Italic)
            {
                newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Italic);
            }
            else
            {
                newFont = new Font(oldFont, oldFont.Style | FontStyle.Italic);
            }
            this.rtbShow.SelectionFont = newFont;
        }

        /// <summary>
        /// 文字下划线菜单事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsmiUnderline_Click(object sender, EventArgs e)
        {
            Font oldFont = this.rtbShow.SelectionFont;
            Font newFont;
            if (oldFont.Underline)
            {
                newFont = new Font(oldFont, oldFont.Style & ~FontStyle.Underline);
            }
            else
            {
                newFont = new Font(oldFont, oldFont.Style | FontStyle.Underline);
            }
            this.rtbShow.SelectionFont = newFont;
        }
    }
}