手把手教你用C#编写一个简单的文本编辑器

首先，打开你的开发工具Microsoft visual studio 2005。文件——》新建项目——》项目类型选择visualc#，模板选择windows 应用程序，到此我们已经创建好一个window窗体了！

接着修改窗体的属性，窗体名字修改为EditorForm，窗体的text属性修改为你要的命名。在工具箱了选择MenuStrip控件如图，把菜单拖到窗体去!

然后选择插入标准项

插入完菜单之后，再从工具箱里拖一个RichTextBox到菜单下面，然后选择停靠父容器，最后一个简单的编辑器的界面出来了！如图：

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好了，界面我们已经设计好了，现在我们来实现功能了！首先从工具箱里面拖一个叫做openFileDialog的控件，这是一个用于打开文件的对话框来的，把这个拖到窗体，然后点击一下OpenFileDialog选定此控件，设置Filter属性默认文本(*.txt)|*.txt|富文本文件(*.rtf)|*.rtf 。当然以后功能扩充后，可以打开别的文件，例如设置Filter的属性为括号里的（数据库文件(*.dat)|*.dat|图像文件(*jpg;*bmp;*gif)|*jpg;*bmp;*gif|文本文件(*.txt)|*.txt|所有文件(*.*)|*.*）。（注意，次数是用于打开文件对话框对要打开的文件进行筛选的，我们这里只是做简单的文本编译器，所以支持的格式分别是.txt 和.rtf格式的文本），最后双击菜单的打开菜单出现

private void 打开OToolStripMenuItem_Click(object sender, EventArgs e){//确定用户选择了文件if (this.openFileDialog.ShowDialog() == DialogResult.OK){//得到用户选择的文件路径和文件名path = this.openFileDialog.FileName;//读取文件内容this.LoadFile();}}private void LoadFile(){if (this.openFileDialog.FilterIndex == 1){//纯文本文件this.richTextBox1.LoadFile(path, RichTextBoxStreamType.PlainText);}if (this.openFileDialog.FilterIndex == 2){this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);}}

我们要在里面写代码实现把PC机上的文件打开到我们的编辑器中进行简单的文字编译了，但是在写代码前，我们要定义一个全局变量，用于记录是否文件是新建的，还是打开来编辑的，我们要把这个变量定义为 string path = null ;

附上所有代码

刚刚学习不久，功能没有完全的实现

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace SimpleEditor{public partial class EditorForm : Form{string path = null;string isSaved = "n";int initLenglt = 0;public EditorForm(string path){this.path = path;InitializeComponent();}private void 新建NToolStripMenuItem_Click(object sender, EventArgs e){if (this.richTextBox1.TextLength > 0 && (isSaved.Equals("n"))){if (MessageBox.Show("文件没有保存是否新建文件？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes){this.richTextBox1.Clear();this.Text = "简单的编辑器";this.initLenglt = richTextBox1.TextLength;}}else{this.richTextBox1.Clear();this.Text = "简单的编辑器";this.initLenglt = richTextBox1.TextLength;}}private void 打开OToolStripMenuItem_Click(object sender, EventArgs e){//确定用户选择了文件if (this.openFileDialog.ShowDialog() == DialogResult.OK){//得到用户选择的文件路径和文件名path = this.openFileDialog.FileName;//读取文件内容this.OpenFile();}}private void OpenFile(){try{string extName = this.path.Substring(this.path.LastIndexOf("."));if (extName.ToLower().Equals(".txt")){//纯文本文件this.richTextBox1.LoadFile(path, RichTextBoxStreamType.PlainText);}if (extName.ToLower().Equals(".rtf")){this.richTextBox1.LoadFile(path, RichTextBoxStreamType.RichText);}this.Text = "文本编辑器" + path;this.isSaved = "y";}catch (Exception ex){MessageBox.Show("请选择合适文件,打开失败");}}private void 保存SToolStripMenuItem_Click(object sender, EventArgs e){if(string.IsNullOrEmpty(this.path)){this.saveFileDialog1.Title = "保存为";if (this.saveFileDialog1.ShowDialog() == DialogResult.OK){this.path = this.saveFileDialog1.FileName;SaveFile();}}else{string extNanme=path.Substring(this.path.LastIndexOf("."));if (extNanme.ToLower().Equals(".txt")){this.richTextBox1.SaveFile(this.path, RichTextBoxStreamType.PlainText);}if(extNanme.ToLower().Equals(".rtf")){this.richTextBox1.SaveFile(this.path, RichTextBoxStreamType.RichText);}}this.initLenglt = richTextBox1.TextLength;}private void SaveFile(){try{if (this.saveFileDialog1.FilterIndex == 1){//纯文本文件this.richTextBox1.SaveFile(path, RichTextBoxStreamType.PlainText);}if (this.saveFileDialog1.FilterIndex == 2){this.richTextBox1.SaveFile(path, RichTextBoxStreamType.RichText);}this.Text = "文本编辑器" + path;this.initLenglt = richTextBox1.TextLength;this.isSaved = "y";}catch (Exception ex){ }}private void 另存为AToolStripMenuItem_Click(object sender, EventArgs e){if (this.saveFileDialog1.ShowDialog() == DialogResult.OK){this.path = this.saveFileDialog1.FileName;SaveFile();}}private void EditorForm_Load(object sender, EventArgs e){this.剪切TToolStripMenuItem.Enabled = false;this.复制CToolStripMenuItem.Enabled = false;if(!string.IsNullOrEmpty(this.path)){this.OpenFile();}}private void 字体ToolStripMenuItem_Click(object sender, EventArgs e){try{string extName = this.path.Substring(this.path.LastIndexOf("."));if (extName.ToLower().Equals(".txt")){this.SettxtFont();}if (extName.ToLower().Equals(".rtf")){this.SetRichtextFont();}}catch(Exception ex){}}private void SettxtFont(){if (this.fontDialog1.ShowDialog() == DialogResult.OK){Font font = this.fontDialog1.Font;this.richTextBox1.Font = font;}}private void SetRichtextFont(){if (this.fontDialog1.ShowDialog() == DialogResult.OK){Font font = this.fontDialog1.Font;this.richTextBox1.SelectionFont = font;}}private void 字体颜色ToolStripMenuItem_Click(object sender, EventArgs e){string extName = this.path.Substring(this.path.LastIndexOf("."));if (extName.ToLower().Equals(".rtf")){if (this.colorDialog1.ShowDialog() == DialogResult.OK){Color color = this.colorDialog1.Color;this.richTextBox1.SelectionColor = color;}}}private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e){if(richTextBox1.SelectionLength>0){this.richTextBox1.Cut();}}private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e){this.richTextBox1.Paste();}private void 复制CToolStripMenuItem_Click(object sender, EventArgs e){if (richTextBox1.SelectionLength > 0){this.richTextBox1.Copy();}}private void richTextBox1_SelectionChanged(object sender, EventArgs e){if (richTextBox1.SelectionLength > 0){this.剪切TToolStripMenuItem.Enabled = true;this.复制CToolStripMenuItem.Enabled = true;}else{this.剪切TToolStripMenuItem.Enabled = false;this.复制CToolStripMenuItem.Enabled = false;}}private void 编辑EToolStripMenuItem_Click(object sender, EventArgs e){}private void 全选AToolStripMenuItem_Click(object sender, EventArgs e){this.richTextBox1.SelectedText.ToString();}private void 退出XToolStripMenuItem_Click(object sender, EventArgs e){this.Close();}private void EditorForm_FormClosing(object sender, FormClosingEventArgs e){if (this.richTextBox1.TextLength > this.initLenglt){ if (MessageBox.Show("文件没有保存是否退出？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.No){e.Cancel = true;}}}private void 关于AToolStripMenuItem_Click(object sender, EventArgs e){AboutBox aboutbox = new AboutBox();aboutbox.ShowDialog();}private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e){this.richTextBox1.Undo();}}}