form1.cs

这是.net2005学习不可缺少的教程

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

        private void Form1_Load(object sender, EventArgs e)
        {
            // Load some default text.
            richTextBox1.Rtf = @"{\rtf1\ansi \b This\b0  is a \ul RichTextBox\ul0. \i Try\i0  some \b formatting\b0!  Also try the right-click Context Menu.}";
        }

        private void toolStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
            manipulateFile(((ToolStripItem)e.ClickedItem).Text);
        }

        private void toolStrip2_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {
            formatText(((ToolStripItem)e.ClickedItem).Text);
        }

        private void fileMenuItem_Click(object sender, EventArgs e)
        {
            manipulateFile(((ToolStripMenuItem)sender).Text);
        }

        private void formatMenuItem_Click(object sender, EventArgs e)
        {
            formatText(((ToolStripMenuItem)sender).Text);
        }

        private void formatText(string menuItemText)
        {
            Font fontOfSelectedText = this.richTextBox1.SelectionFont;
            FontStyle styleApplied;

            switch (menuItemText)
            {
                case "粗体":
                    if (this.richTextBox1.SelectionFont.Bold == true)
                        styleApplied = FontStyle.Regular;
                    else
                        styleApplied = FontStyle.Bold;

                    break;
                case "斜体":
                    if (this.richTextBox1.SelectionFont.Italic == true)
                        styleApplied = FontStyle.Regular;
                    else
                        styleApplied = FontStyle.Italic;

                    break;

                case "下划线":
                    if (this.richTextBox1.SelectionFont.Italic == true)
                        styleApplied = FontStyle.Regular;
                    else
                        styleApplied = FontStyle.Underline;

                    break;
                default:
                    if (this.richTextBox1.SelectionFont.Underline == true)
                        styleApplied = FontStyle.Regular;
                    else
                        styleApplied = FontStyle.Underline;

                    break;
            }

            Font FontToApply = new Font(fontOfSelectedText, styleApplied);
            this.richTextBox1.SelectionFont = FontToApply;
        }

        private void manipulateFile(string menuItemText)
        {
            switch (menuItemText)
            {
                case "新建":
                    // Simulate creating a new document by merely clearing the existing text.
                    richTextBox1.Text = "";
                    richTextBox1.Focus();

                    break;
                case "打开":
                    if (this.openFileDialog.ShowDialog() == DialogResult.OK)
                    {
                        FileOpen();
                    }

                    break;
                case "保存":
                    if (this.saveFileDialog.ShowDialog() == DialogResult.OK)
                    {
                        FileSave();
                    }

                    break;
                default:
                    this.Close();
                    this.Dispose();

                    break;
            }
        }

        private void FileOpen()
        {
            string strFileName = this.openFileDialog.FileName;
            FileStream fs = new FileStream(strFileName, FileMode.Open, FileAccess.Read);
            StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding(54936));

            try
            {
                this.richTextBox1.Rtf = sr.ReadToEnd();
            }
            catch (System.IO.FileNotFoundException eNotFound)
            {
                MessageBox.Show("没有找到帮助文件,请确认您的安装包." + eNotFound.Message.ToString(), "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception e)
            {
                MessageBox.Show("未知错误,请联系开发人员. \n" + e.Message.ToString());
            }
            finally
            {
                sr.Close();
                fs.Close();
            }
        }

        private void FileSave()
        {
            string strFileName = this.saveFileDialog.FileName;
            FileStream fs = new FileStream(strFileName, FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.GetEncoding(54936));

            try
            {
                sw.Write(this.richTextBox1.Rtf);
            }
            catch (System.IO.FileNotFoundException eNotFound)
            {
                MessageBox.Show("没有找到帮助文件,请确认您的安装包." + eNotFound.Message.ToString(), "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (Exception e)
            {
                MessageBox.Show("未知错误,请联系开发人员. \n" + e.Message.ToString());
            }
            finally
            {
                sw.Close();
                fs.Close();
            }

        }

        private void ToolStripMenuItemContextClick(object sender, EventArgs e)
        {
            formatText(((ToolStripMenuItem)sender).Text);
        }
    }
}