用c#做记事本一些问题

回答1：

记事本应该用 TextBox ,TextBox 不带有字体、字号等样式。

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;
using System.Threading;
using System.Diagnostics;

namespace Hongcing.Notepad
{
///

/// 主窗口
///

public partial class MainForm : Form
{
///

/// 文件路径
///

string filePath;

///

/// 文件标题
///

string fileTitle;

///

/// 文件属性
///

string fileAttrib;

///

/// 消息框标题
///

string caption;

///

/// 文件编码
///

Encoding fileEncoding = Encoding.Default;

///

/// 关于对话框
///

AboutBox aboutBox = new AboutBox();

///

/// 新建主窗口实例
///

public MainForm()
{
InitializeComponent();
}

///

/// 获取文件编码
///

/// 文件路径
/// 当前编码
/// 文件的编码
private Encoding GetFileEncoding(string filePath, Encoding curEncoding)
{
Encoding retEncoding = curEncoding;
FileStream input = null;
BinaryReader binReader = null;
try
{
input = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None);
binReader = new BinaryReader(input);
//读取字节数
int length = 4;
if (input.Length < length)
length = (int)input.Length;
byte[] bom = binReader.ReadBytes(length);
if (bom.Length >= 3 && bom[0] == 0xEF && bom[1] == 0xBB && bom[2] == 0xBF)
return retEncoding = Encoding.UTF8;
if (bom.Length >= 2 && bom[0] == 0xFF && bom[1] == 0xFE)
//再检测是否为UTF32
retEncoding = Encoding.Unicode;
if (bom.Length >= 2 && bom[0] == 0xFE && bom[1] == 0xFF)
return retEncoding = Encoding.BigEndianUnicode;
if (bom.Length >= 4 && bom[0] == 0xFF && bom[1] == 0xFE && bom[2] == 0x00 && bom[3] == 0x00)
return retEncoding = Encoding.UTF32;
if (bom.Length >= 4 && bom[0] == 0x00 && bom[1] == 0x00 && bom[2] == 0xFE && bom[3] == 0xFF)
return retEncoding = Encoding.GetEncoding(12001);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
if (binReader != null)
binReader.Close();
if (input != null)
input.Close();
}
return retEncoding;
}

///

/// 新建文件
///

private void NewFile()
{
textBoxMain.Clear();
filePath = "";
fileEncoding = Encoding.Default;
}

///

/// 打开文件
///

private void OpenFile()
{
openDlg.FileName = "";
openDlg.InitialDirectory = Environment.CurrentDirectory;
if (openDlg.ShowDialog() == DialogResult.OK)
{
try
{
textBoxMain.Clear();
filePath = openDlg.FileName;
fileEncoding = GetFileEncoding(filePath, fileEncoding);
textBoxMain.Text = File.ReadAllText(filePath, fileEncoding);
//string allText = File.ReadAllText(filePath, fileEncoding);
//textBoxMain.Clear();
//filePath = openDlg.FileName;
//fileEncoding = GetFileEncoding(filePath, fileEncoding);
//textBoxMain.Text = allText;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}

///

/// 另存为文件
///

private void SaveAsFile()
{
saveDlg.FileName = filePath;
saveDlg.InitialDirectory = Environment.CurrentDirectory;
if (saveDlg.ShowDialog() == DialogResult.OK)
{
string fileNameTemp = saveDlg.FileName;
if (File.Exists(fileNameTemp) && new FileInfo(filePath).IsReadOnly)//可能引发异常
{
string showInfo = fileNameTemp + "\r\n该文件已存在，而且具有只读属性。\r\n请使用其他文件名。";
MessageBox.Show(showInfo, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
SaveAsFile();
}
else
{
try
{
File.WriteAllText(fileNameTemp, textBoxMain.Text, fileEncoding);
textBoxMain.Modified = false;
filePath = saveDlg.FileName;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}
}

///

/// 保存文件
///

private void SaveFile()
{
if (filePath.Length != 0)
{
if (File.Exists(filePath) && new FileInfo(filePath).IsReadOnly)//可能引发异常
{
string showInfo = filePath + "\r\n该文件已存在，而且具有只读属性。\r\n请使用其他文件名。";
MessageBox.Show(showInfo, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
SaveAsFile();
}
else
{
try
{
File.WriteAllText(filePath, textBoxMain.Text, fileEncoding);
textBoxMain.Modified = false;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
}
else
SaveAsFile();
}

///

/// 自动改变菜单、按钮启用状态。
///

///
///
private void timerMain_Tick(object sender, EventArgs e)//是否可以改为在鼠标或者键盘响应时启动，不响应时关闭？
{
if (string.IsNullOrEmpty(filePath))
{
filePath = "";
fileTitle = "无标题";
fileAttrib = "\u0020";
}
else
{
fileTitle = Path.GetFileName(filePath);
if (File.Exists(filePath) && new FileInfo(filePath).IsReadOnly)
fileAttrib = "（只读）";
else
fileAttrib = "\u0020";
}
this.Text = fileTitle + fileAttrib + "- 记事本";

if (textBoxMain.CanUndo)
menuUndo.Enabled = true;
else
menuUndo.Enabled = false;

if (textBoxMain.SelectedText.Length == 0)
{
menuCut.Enabled = false;
menuCopy.Enabled = false;
menuDelete.Enabled = false;
}
else
{
menuCut.Enabled = true;
menuCopy.Enabled = true;
menuDelete.Enabled = true;
}

if (Clipboard.ContainsText())
menuPaste.Enabled = true;
else
menuPaste.Enabled = false;

if (textBoxMain.Text.Length == 0)
menuSelectAll.Enabled = false;
else
menuSelectAll.Enabled = true;

if (textBoxMain.Modified)
labelTextModified.Text = "文字已经改变。";
else
labelTextModified.Text = "文字没有改变。";

labelTextEncoding.Text = "当然文本编码：" + fileEncoding.EncodingName;

labelNull.Text = "Ln " + (textBoxMain.Lines.Length + 1) + ", Col " + (textBoxMain.SelectionStart + 1);
}

///

/// 载入窗体
///

///
///
private void MainForm_Load(object sender, EventArgs e)
{
caption = aboutBox.AssemblyTitle;

timerMain.Start();
statusStripMain.Visible = false;

labelTextModified.Visible = labelTextEncoding.Visible = false;

string[] args = Program.args;
string cmdLine = "";
foreach (string arg in args)
cmdLine += arg;

string filePathTemp = cmdLine.Replace("/p", "").Replace("\"", "").Trim();
if (filePathTemp.Length == 0)
Environment.CurrentDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
else
{
if (File.Exists(filePathTemp) == false && Path.HasExtension(filePathTemp) == false)
filePathTemp = filePathTemp + ".txt";

if (File.Exists(filePathTemp))
{
try
{
string allText = File.ReadAllText(filePathTemp, fileEncoding);
textBoxMain.Clear();
filePath = filePathTemp;
fileEncoding = GetFileEncoding(filePath, fileEncoding);
textBoxMain.Text = allText;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}

textBoxMain.SelectionStart = 0;
}
else
{
string showInfo = string.Format("找不到文件: {0}。\r\n\r\n要创建新文件吗?", filePathTemp);
switch (MessageBox.Show(showInfo, caption, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning))
{
case DialogResult.Yes:
try
{
File.WriteAllText(filePathTemp, textBoxMain.Text, fileEncoding);
textBoxMain.Modified = false;

textBoxMain.Clear();
string allText = File.ReadAllText(filePathTemp, fileEncoding);
textBoxMain.Clear();
filePath = filePathTemp;
fileEncoding = GetFileEncoding(filePath, fileEncoding);
textBoxMain.Text = allText;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
break;
case DialogResult.Cancel:
this.Dispose(true);
Application.Exit();
break;
}
}
}
}

///

/// 关闭窗体
///

///
///
private void MainForm_Closing(object sender, FormClosingEventArgs e)
{
if (textBoxMain.Modified)
{
if (filePath.Length != 0 || textBoxMain.Text.Length != 0)
{
string showInfo = "文件 {0} 的文字已经改变。\r\n\r\n想保存文件吗？";
if (filePath.Length == 0)
showInfo = string.Format(showInfo, fileTitle);
else
showInfo = string.Format(showInfo, filePath);
switch (MessageBox.Show(showInfo, caption, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning))
{
case DialogResult.Yes:
SaveFile();
if (textBoxMain.Modified)
goto default;
else
goto case DialogResult.No;
case DialogResult.No:
this.Dispose(true);
break;
default:
e.Cancel = true;
break;
}
}
else
this.Dispose(true);
}
else
this.Dispose(true);//释放所有使用的资源。如果没有这一句，窗口可以关闭啊！但是在占用资源。
}

private void menuNew_Click(object sender, EventArgs e)
{
if (textBoxMain.Modified)
{
if (filePath.Length != 0 || textBoxMain.Text.Length != 0)
{
string showInfo = "文件 {0} 的文字已经改变。\r\n\r\n想保存文件吗？";
if (filePath.Length == 0)
showInfo = string.Format(showInfo, fileTitle);
else
showInfo = string.Format(showInfo, filePath);
switch (MessageBox.Show(showInfo, caption, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning))
{
case DialogResult.Yes:
SaveFile();
if (textBoxMain.Modified)
goto default;
else
goto case DialogResult.No;
case DialogResult.No:
NewFile();
break;
default:
break;
}
}
else
NewFile();
}
else
NewFile();
}

private void menuOpen_Click(object sender, EventArgs e)
{
if (textBoxMain.Modified)
{
if (filePath.Length != 0 || textBoxMain.Text.Length != 0)
{
string showInfo = "文件 {0} 的文字已经改变。\r\n\r\n想保存文件吗？";
if (filePath.Length == 0)
showInfo = string.Format(showInfo, fileTitle);
else
showInfo = string.Format(showInfo, filePath);
switch (MessageBox.Show(showInfo, caption, MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning))
{
case DialogResult.Yes:
SaveFile();
if (textBoxMain.Modified)
goto default;
else
goto case DialogResult.No;
case DialogResult.No:
OpenFile();
break;
default:
break;
}
}
else
OpenFile();
}
else
OpenFile();
}

private void menuSave_Click(object sender, EventArgs e)
{
SaveFile();
}

private void menuSaveAs_Click(object sender, EventArgs e)
{
SaveAsFile();
}

private void menuPageSetup_Click(object sender, EventArgs e)
{

}

private void menuPrint_Click(object sender, EventArgs e)
{

}

private void menuExit_Click(object sender, EventArgs e)
{
this.Dispose(true);
Application.Exit();
}

private void menuUndo_Click(object sender, EventArgs e)
{
textBoxMain.Undo();
}

private void menuCut_Click(object sender, EventArgs e)
{
textBoxMain.Cut();
}

private void menuCopy_Click(object sender, EventArgs e)
{
textBoxMain.Copy();
}

private void menuPaste_Click(object sender, EventArgs e)
{
textBoxMain.Paste();
}

private void menuDelete_Click(object sender, EventArgs e)
{
textBoxMain.SelectedText = "";//无法撤销
textBoxMain.Modified = true;//哎！这行让我绕个大圈。
}

private void menuFind_Click(object sender, EventArgs e)
{
new FindForm().Show(this);
}

private void menuFindNext_Click(object sender, EventArgs e)
{

}

private void menuReplace_Click(object sender, EventArgs e)
{
new ReplaceForm().Show(this);
}

private void menuGoto_Click(object sender, EventArgs e)
{
new GotoForm().ShowDialog(this);
}

private void menuSelectAll_Click(object sender, EventArgs e)
{
textBoxMain.SelectAll();
}

private void menuDateTime_Click(object sender, EventArgs e)
{
textBoxMain.AppendText(DateTime.Now.ToString("HH:mm:ss yyyy-M-d"));
}

private void menuWordWrap_Click(object sender, EventArgs e)
{
textBoxMain.WordWrap = !textBoxMain.WordWrap;
menuWordWrap.Checked = !menuWordWrap.Checked;
if (menuWordWrap.Checked)
{
menuStatus.Checked = false;
menuStatus.Enabled = false;
statusStripMain.Visible = false;
}
else
menuStatus.Enabled = true;
}

private void menuFont_Click(object sender, EventArgs e)
{
fontDlg.Font = textBoxMain.Font;
if (fontDlg.ShowDialog() == DialogResult.OK)
textBoxMain.Font = fontDlg.Font;
}

private void menuStatus_Click(object sender, EventArgs e)
{
statusStripMain.Visible = !statusStripMain.Visible;
menuStatus.Checked = !menuStatus.Checked;
}

private void menuHelpContext_Click(object sender, EventArgs e)
{
string notepadHelpFile = Path.Combine(Environment.GetEnvironmentVariable("SystemRoot"), @"Help\notepad.chm");//可能引发异常
if (File.Exists(notepadHelpFile))
Help.ShowHelp(this, notepadHelpFile);//可能引发异常
else
{
string showInfo = "帮助文件不存在。";
MessageBox.Show(showInfo, caption, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}

private void menuAbout_Click(object sender, EventArgs e)
{
aboutBox.ShowDialog(this);//可能引发异常
}

private void menuGB2312_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.GetEncoding(936);
}

private void menuGB18030_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.GetEncoding(54936);
}

private void menuUnicode_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.Unicode;
}

private void menuUnicodeBE_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.BigEndianUnicode;
}

private void menuUTF32_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.UTF32;
}

private void menuUTF32BE_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.GetEncoding(12001);
}

private void menuUTF8_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.UTF8;
}

private void menuUTF7_Click(object sender, EventArgs e)
{
fileEncoding = Encoding.UTF7;
}

private void statusStripMain_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
labelTextModified.Visible = labelTextEncoding.Visible = menuEncoding.Visible = !menuEncoding.Visible;
}
}
}

回答2：

我给你发个我刚学的时候做的一个记事本，怎么弄我也忘的差不多了。你自己看吧能看懂多少就看多少，看不懂就复制过去试试呵呵
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Windowsjishiben
{
public partial class Form1 : Form
{
private string filename;
RichTextBoxStreamType type;
private int findi = 0;
public Form1()
{
InitializeComponent();
}

private void 文件FToolStripMenuItem_Click(object sender, EventArgs e)
{

}

private void 查找ToolStripMenuItem_Click(object sender, EventArgs e)
{
string findstr = "什么";
try
{
findi = richTextBox1.Find(findstr, findi, RichTextBoxFinds.MatchCase);
richTextBox1.Select(findi, findstr.Length);
findi = findi + findstr.Length;
}
catch (Exception ex)
{
findi = 0;
}
}

private void toolStripMenuItem3_Click(object sender, EventArgs e)
{

}

private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
{
FontDialog MyFontDialog = new FontDialog();
if (MyFontDialog.ShowDialog() == DialogResult.OK)
{
richTextBox1.SelectionFont = MyFontDialog.Font;
}
}

private void 颜色ToolStripMenuItem_Click(object sender, EventArgs e)
{
ColorDialog MyColorDialog = new ColorDialog();
if (MyColorDialog.ShowDialog() == DialogResult.OK)
{
richTextBox1.SelectionColor = MyColorDialog.Color;
}
}

private void 退出ToolStripMenuItem1_Click(object sender, EventArgs e)
{
DialogResult dResult = MessageBox.Show("你确定要退出吗？", "系统提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dResult == DialogResult.Yes)
{
Application.Exit();
}
}

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
{
DialogResult dResult = MessageBox.Show("你确定要退出吗？", "系统提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (dResult == DialogResult.Yes)
{
Application.Exit();
}
}

private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.Copy();
}

private void 粘贴VToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.Paste();
}

private void 剪切XToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.Cut();
}

private void 撤销ZToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.Undo();
}

private void 新建ToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.Text = "";
}

private void 打开OToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog MyOpenFileDialog = new OpenFileDialog();
MyOpenFileDialog.InitialDirectory = @"C:\Documents and Settings\Administrator\My Documents";
MyOpenFileDialog.Filter = "txt格式文件|*.txt|C#类文件|*.cs|所有格式|*.*";
MyOpenFileDialog.FilterIndex = 2;
if (MyOpenFileDialog.ShowDialog() == DialogResult.OK)
{
try
{
filename = MyOpenFileDialog.FileName;
string k = filename.Substring(filename.LastIndexOf(".") + 1);
type = RichTextBoxStreamType.PlainText;
switch (k)
{
case "rtf":
type = RichTextBoxStreamType.RichText;
break;
case "txt":
case "cs":
type = RichTextBoxStreamType.PlainText;
break;
default:
System.Diagnostics.Process.Start(filename);
return;
break;
}
richTextBox1.LoadFile(filename, type);
}
catch (Exception ex)
{
DialogResult t = MessageBox.Show("打开文件出错", "警告", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
if (t == DialogResult.Yes)
{
richTextBox1.Text = "";
}
else
{
Application.Exit();
}
}
}
}

private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)
{
richTextBox1.SaveFile(filename, type);
}

private void 另存为AToolStripMenuItem_Click(object sender, EventArgs e)
{
SaveFileDialog MySaveFileDialog = new SaveFileDialog();
MySaveFileDialog.InitialDirectory = @"C:\Documents and Settings\Administrator\My Documents";
MySaveFileDialog.Filter = "txt格式文件|*.txt|C#类文件|*.cs|所有格式|*.*";
MySaveFileDialog.FilterIndex = 1;
if (MySaveFileDialog.ShowDialog() == DialogResult.OK)
{
richTextBox1.SaveFile(MySaveFileDialog.FileName, RichTextBoxStreamType.RichText);
}
}

private void toolStripButton1_Click(object sender, EventArgs e)
{
MessageBox.Show("你别乱点，点坏了你赔不起！");
}

private void Form1_Load(object sender, EventArgs e)
{
string filename = Application.StartupPath + @"\..\..\file\test.txt";
richTextBox1.LoadFile(filename, RichTextBoxStreamType.PlainText);
}

private void toolStripButton2_Click(object sender, EventArgs e)
{
MessageBox.Show("你点击了血轮眼，触发幻术事件!");
}

private void label1_Click(object sender, EventArgs e)
{

}

private void timer1_Tick(object sender, EventArgs e)
{

}

private void timer1_Tick_1(object sender, EventArgs e)
{
toolStripLabel2.Text = Convert.ToString(DateTime.Now.ToLocalTime());
}

private void toolStripLabel2_Click(object sender, EventArgs e)
{

}
}
}

回答3：

用richTextBox这个控件，功能强悍些。
1.用Anchor这个属性，上下左右都选，可以随窗口变化缩放
2.你说的是combox这个控件吗？
3.有saveFileDialog和openFileDialog这两个控件
4.还是用控件--FontDialog

回答4：

保存打开有个savefiledialog插件，从工具栏拖到窗体在编写相关程序，上面那么长一串代码中有，改变字体用FONT类，文本框下拉功能在文本框属性的ScrollBars里，把ScrollBars得值改成Vertical就行了