C#记事本源代码(包括详细注释)

记事本 源码工程下载(需要1资源分)。

拖放控件：  menuStrip  toolStrip  fontDialog  colorDialog  contextMenuStrip  statusStrip  timer (两个)

《拓展功能》中的toolStripComboBox1.Items(集合)自己定义(就是上图显示下拉框)，用于自动保存的时间。

        /// <summary> --自动保存--        ///  用户自定义  声明的--自动保存--方法        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void AuSaveD()        {            int sj;            string str1 = toolStripComboBox1.Text;            sj = Convert.ToInt32(str1);            //sj = int.Parse(str1);            if (自动保存SToolStripMenuItem.Checked == true)            {                自动保存SToolStripMenuItem.Checked = true;                保存模式toStabel.Text = "自动模式：";                保存模式toStabel.ForeColor = Color.Purple;  //紫色                timer2.Interval = sj * 60000;                timer2.Enabled = true;            }            else            {                自动保存SToolStripMenuItem.Checked = false; timer2.Enabled = false;                保存模式toStabel.Text = "手动模式：";                保存模式toStabel.ForeColor = Color.Black; //黑色            }        }

timer2.Interval = sj * 60000;  // 定义toolStripComboBox1.Text为多少分钟自动保存

toolStripComboBox1.SelectedIndex = 2; // 在装载窗体中设置保存时间默认项

contextMenuStrip1.Name=cotxtMeStr; 用于文本右击菜单。(详细功能自己设置)

statusStrip1 设置，如下图：

toolStrip1(工具栏)插入标准项(如下图)，自定义项要自己选择图片。然后 编辑项 的顺序，分组(如上图显示)。

记事本主窗口代码：RichTextBox1.Name=txtInput;

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;//using System.Reflection;namespace Notepad{    public partial class Form1 : Form    {        public Form1()        {   //这里面尽可能不要放代码            InitializeComponent();        }        #region - 获取光标坐标位置 直接使用方法 Ranks();        /// <summary>自定义方法 --         ///  获取文本中(行和列)--光标--坐标位置的调用方法        /// </summary>        private void Ranks()        {            /*  得到光标行第一个字符的索引，             *  即从第1个字符开始到光标行的第1个字符索引*/            int index = txtInput.GetFirstCharIndexOfCurrentLine();            /*得到光标行的行号,第1行从0开始计算，习惯上我们是从1开始计算，所以+1。 */            int line = txtInput.GetLineFromCharIndex(index) + 1;            /*  SelectionStart得到光标所在位置的索引             *  再减去             *  当前行第一个字符的索引             *  = 光标所在的列数(从0开始)  */            int col = txtInput.SelectionStart - index + 1;            this.行列toStabel.Text = string.Format("第：{0}行 {1}列", line.ToString(), col.ToString());        }        //释放按键时发生        private void txtInput_KeyUp(object sender, KeyEventArgs e)        {            this.Ranks();        }        //释放鼠标时发生        private void txtInput_MouseUp(object sender, MouseEventArgs e)        {            this.Ranks();        }        #endregion        #region  --自定义的变量--        /// <summary> -- txtName 用于储存文件名 -- </summary>        private string txtName = "";        private string filePath = "";//储存文件路径        /// <summary> -- b 判断是否为打开的文件，true为真 -- </summary>        bool b = false;        /// <summary> -- s 判断文本是否未保存，true为保存 -- </summary>        bool s = true;        #endregion        #region -- 菜单中的 -- 新建/保存/另存为--等声明方法        /// <summary> -- 新建文本 --        ///  用户自定义  声明的--新建--方法        /// </summary>        private void Newfile()        {  /* 新建文本，保存后清空text，s 的值会变为false，所以要把 s =true */            if (b == true)//判断是否为打开的文件            {                this.AskDialog();            }            else            {                this.AskDialog();            }            Text = "新建-Mxdr记事本";            //清除储存的文件名            txtName = "";            //新建文本文档后应该把 b 设为 false            b = false;         }        /// <summary> --打开--        ///  用户自定义  声明的--打开--方法        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void Openthe()        {            if (s == true)            {                this.OpenFile();            }            else            {                this.AskDialog();                this.OpenFile();            }        }        /// <summary> --打开文件的方法--        ///  用户自定义          /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void OpenFile()        {            OpenFileDialog ofd = new OpenFileDialog();            //对话框提示标题文字。            ofd.Title = "打开文本文档-Mxdr记事本";            //过滤文件，只显示文本文档格式的文件。            ofd.Filter = "文本文档|*.txt|所有文档|*.*";            if (ofd.ShowDialog() == DialogResult.OK)            {                //声明一个文件流对象，用来存放读取的文件流对象。                FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read, FileShare.None);                //将文件名赋值给临时变量。                txtName = ofd.FileName;                //创建读取器，用来将文件流中的数据读取出来。                StreamReader sr = new StreamReader(fs, Encoding.Default);                //通过读取器将文件流中的数据读取到文本框中。                txtInput.Text = sr.ReadToEnd();                //关闭读取器。                sr.Close();                //和关闭文件流。                fs.Close();                //由于文件读取原理，上面两项关闭必须操作，否则无法成功读取文件。            }            this.Text = txtName + "-Mxdr记事本";            b = true;            s = true;        }        /// <summary> --保存--        ///  用户自定义  声明的--保存--方法        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        protected void Save()        {            if (b == true)            {                SaveFileDialog ofg = new SaveFileDialog();                txtInput.SaveFile(txtName, RichTextBoxStreamType.PlainText);                s = true;            }            else { SaveAs(); }        }        /// <summary> --另存为--        ///  用户自定义  声明的--另存为--方法        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void SaveAs()        {            SaveFileDialog ofd = new SaveFileDialog();            //对话框提示标题文字。            ofd.Title = "另存为-Mxdr记事本";            //保存文本文档，以.txt作为后缀名，如果有则不加，否则添加后缀.txt。            ofd.Filter = "文本文档|*.txt|所有文档|*.*";            ofd.FileName = "Mxdr记事本-" + DateTime.Now.ToString("yyyyMMddHHmm")+".txt";  //保存文件名            if (ofd.ShowDialog() == DialogResult.OK)            {                txtInput.SaveFile(ofd.FileName, RichTextBoxStreamType.PlainText);                txtName = "";                filePath = "";                Text = "新建-Mxdr记事本";                this.txtInput.Text = "";                s = true;            }        }        /// <summary> --询问对话框--        ///  用户自定义  询问用户是否保存已改变的文本内容        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void AskDialog()        {            //如果文本未保存，提示保存            if (s == false)    //(this.richTextBox1.Text != string.Empty)            {                DialogResult r = MessageBox.Show("是否保存当前文件？",                    "Mxdr温馨提示",                    MessageBoxButtons.YesNoCancel,                    MessageBoxIcon.Information);                /* 判断用户选择,若选择"是/Yes"，弹出保存文件的对话框                 * 若选择"否/No",不弹对话框,直接清空内容                 * 若选择"取消/Cancel",无动作 */                if (r == DialogResult.Yes)                {                    // 保存文件                    Save();                    //txtName = "";                    //filePath = "";                    //Text = "新建-Mxdr记事本";                    //this.txtInput.Text = "";                    ////OpenFile();                    //s = true;                }                else if (r == DialogResult.No)                {                    // 用户选择不保存时将输入框中的内容清除                    //this.richTextBox1.Text = "";                    Text = "新建-Mxdr记事本";                    this.txtInput.Clear();                    //如果文本为 Null 把统计还原                    if (txtInput.Text.Length <= 0)                    {                        大小toStabel.Text = "大小：0KB";                        计数toStabel.Text = "其中：0/符号，0/字母，0/数字，0/汉字 =0字";                    }                    this.Ranks();                    b = false;                    s = true;                }            }            else   //否则直接清空文本            {                //this.txtInput.Clear();  //清除文本内容                this.txtInput.Text = "";                //如果文本为 Null 把统计还原                if (txtInput.Text.Length <= 0)                {                    大小toStabel.Text = "大小：0KB";                    计数toStabel.Text = "其中：0/符号，0/字母，0/数字，0/汉字 =0字";                }                this.Ranks();                s = true;            }        }                #endregion        #region  -- 文件菜单中的 -- 新建 - 打开 -- 保存 - 另存为 --        private void 新建NToolStripMenuItem_Click(object sender, EventArgs e)        {            Newfile();        }        private void 新建NToolStripButton_Click(object sender, EventArgs e)        {            Newfile();        }        private void 打开OToolStripMenuItem_Click(object sender, EventArgs e)        {            Openthe();        }        private void 打开OToolStripButton_Click(object sender, EventArgs e)        {            Openthe();        }        private void 保存SToolStripButton_Click(object sender, EventArgs e)        {            Save();        }        private void 保存SToolStripMenuItem_Click(object sender, EventArgs e)        {            Save();        }        private void 另存为AToolStripMenuItem_Click(object sender, EventArgs e)        {            SaveAs();        }        private void 退出XToolStripMenuItem_Click(object sender, EventArgs e)        {            this.Close();        }        #endregion        #region -- 菜单中的 -- 剪切/复制/粘贴/撤消/删除--查找/替换--        private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Undo();        }        private void 重复RToolStripMenuItem_Click(object sender, EventArgs e)        {        }        private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Cut();        }        private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Copy();        }        private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Paste();        }        private void 剪切UToolStripButton_Click(object sender, EventArgs e)        {            this.txtInput.Cut();        }        private void 复制CToolStripButton_Click(object sender, EventArgs e)        {            this.txtInput.Copy();        }        private void 粘贴PToolStripButton_Click(object sender, EventArgs e)        {            this.txtInput.Paste();        }        //删除        private void toolStripMenuItem6_Click(object sender, EventArgs e)        {//删除            this.txtInput.Text = txtInput.Text.Remove(txtInput.SelectionStart,                txtInput.SelectionLength);        }        //查找        private void toolStripMenuItem1_Click(object sender, EventArgs e)        {            formFind findform = new formFind();            findform.Show(this.txtInput);        }        //查找下一个        private void toolStripMenuItem2_Click(object sender, EventArgs e)        {            formFind findform = new formFind();            findform.Show(this.txtInput);        }        //替换        private void toolStripMenuItem3_Click(object sender, EventArgs e)        {            formFind findform = new formFind();            findform.Show(this.txtInput);        }               private void 全选AToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.SelectAll();        }        private void 时间日期ToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Text = txtInput.Text.Insert(txtInput.Text.Length,                "当前时间:" + System.DateTime.Now.ToString());            txtInput.SelectionStart = txtInput.Text.Length;            txtInput.Focus();//获得焦点            this.txtInput.ScrollToCaret();        }        #endregion --         #region ---- 菜单中的 -- 自动换行/字体/背景        private void 自动换行WToolStripMenuItem_Click(object sender, EventArgs e)        {            if (自动换行WToolStripMenuItem.Checked != true)            {                //自动换行点击Checked属性更改,多文本WordWrap为false                自动换行WToolStripMenuItem.Checked = false;                txtInput.WordWrap = false;            }            else            {                自动换行WToolStripMenuItem.Checked = true;                txtInput.WordWrap = true;            }        }        private void 字体FToolStripMenuItem1_Click(object sender, EventArgs e)        {            FontDialog font = new FontDialog();            if (font.ShowDialog() == DialogResult.OK)            { this.txtInput.Font = font.Font; }        }        private void 字体颜色bToolStripMenuItem_Click(object sender, EventArgs e)        {            //创建颜色对话框            colorDialog1.ShowDialog();            txtInput.SelectionColor = colorDialog1.Color;        }        private void 默认字体颜色CToolStripMenuItem_Click(object sender, EventArgs e)        {            txtInput.SelectionColor = Color.Black;        }        private void 文本背景ToolStripMenuItem_Click(object sender, EventArgs e)        {            //创建颜色对话框            colorDialog1.ShowDialog();            txtInput.BackColor = colorDialog1.Color;            文本背景ToolStripMenuItem.Checked = true;            默认背景RToolStripMenuItem.Checked = false;        }        private void 默认背景RToolStripMenuItem_Click(object sender, EventArgs e)        {            if (默认背景RToolStripMenuItem.Checked != false)            {                默认背景RToolStripMenuItem.Checked = true;                文本背景ToolStripMenuItem.Checked = false;                txtInput.BackColor = Color.WhiteSmoke;// WhiteSmoke;            }        }        #endregion --        #region -- 菜单中的 -- 工具栏/状态栏        //选项与自定义未设置        private void 自定义CToolStripMenuItem_Click(object sender, EventArgs e)        {        }        private void 选项OToolStripMenuItem_Click(object sender, EventArgs e)        {        }        private void 工具栏ToolStripMenuItem_Click(object sender, EventArgs e)        {            Point point;            if (工具栏ToolStripMenuItem.Checked != true)            {                // 隐藏工具栏时，把坐标设为（0，24）,因为菜单的高度为24                point = new Point(0, 24);                工具栏ToolStripMenuItem.Checked = false;                toolStrip1.Visible = false;                txtInput.Location = point;                txtInput.Height += toolStrip1.Height;            }            else            {                /* 显示工具栏时，多格式文本框左上角位置的位置为（0，49），                 *  因为工具栏的高度为25，加上菜单的高度24后为49                                   */                point = new Point(0, 49);                工具栏ToolStripMenuItem.Checked = true;                toolStrip1.Visible = true;                txtInput.Location = point;                txtInput.Height -= toolStrip1.Height;            }        }        private void 状态栏SToolStripMenuItem_Click(object sender, EventArgs e)        {            if (状态栏SToolStripMenuItem.Checked == false)            {                //状态栏SToolStripMenuItem.Checked = false;                statusStrip1.Visible = false;                txtInput.Height += statusStrip1.Height;            }            else            {                //状态栏SToolStripMenuItem.Checked = true;                statusStrip1.Visible = true;                txtInput.Height -= statusStrip1.Height;            }        }        #endregion --         #region -- 菜单中的 -- 对齐方式        private void 左对齐ToolStripMenuItem_Click(object sender, EventArgs e)        {            /*利用richTextBox1的属性SelectionAlignment            * 获取或设置应用到当前选定内容或插入点的对齐方式。            * 利用HorizontalAlignment 枚举的成员Left,            * 设置对象或文本与控件元素的左侧对齐。            */            if (左对齐ToolStripMenuItem.Checked == true)            {                this.txtInput.SelectionAlignment = HorizontalAlignment.Left;                左对齐ToolStripMenuItem.Checked = true;                居中ToolStripMenuItem.Checked = false;                右对齐ToolStripMenuItem.Checked = false;            }        }        private void 居中ToolStripMenuItem_Click(object sender, EventArgs e)        {            /*利用richTextBox1的属性SelectionAlignment            * 获取或设置应用到当前选定内容或插入点的对齐方式。            * 利用HorizontalAlignment 枚举的成员Center，            * 设置对象或文本与控件元素的左侧对齐。            */            if (居中ToolStripMenuItem.Checked == true)            {                this.txtInput.SelectionAlignment = HorizontalAlignment.Center;                左对齐ToolStripMenuItem.Checked = false;                居中ToolStripMenuItem.Checked = true;                右对齐ToolStripMenuItem.Checked = false;            }        }        private void 右对齐ToolStripMenuItem_Click(object sender, EventArgs e)        {            /*利用richTextBox1的属性SelectionAlignment             *  获取或设置应用到当前选定内容或插入点的对齐方式。             *  利用HorizontalAlignment 枚举的成员Right，             *  设置对象或文本与控件元素的左侧对齐。             */            if (右对齐ToolStripMenuItem.Checked == true)            {                this.txtInput.SelectionAlignment = HorizontalAlignment.Right;                左对齐ToolStripMenuItem.Checked = false;                居中ToolStripMenuItem.Checked = false;                右对齐ToolStripMenuItem.Checked = true;            }        }        #endregion --         #region -- 菜单中的 -- 回车多行/自动保存/显示时间        private void 回车多行EToolStripMenuItem_Click(object sender, EventArgs e)        {            if (回车多行EToolStripMenuItem.Checked != true)            {                StripMenuEnt.Text = "回车单行";                StripMenuEnt.ForeColor = Color.Blue;                回车多行EToolStripMenuItem.Checked = false;            }            else            {                回车多行EToolStripMenuItem.Checked = true;                StripMenuEnt.Text = "回车多行";                StripMenuEnt.ForeColor = Color.Purple;            }        }        //回车多行        private void EntBtton_Click(object sender, EventArgs e)        {            if (回车多行EToolStripMenuItem.Checked == true)             { 回车多行EToolStripMenuItem.Checked = false;            StripMenuEnt.Text = "回车单行";            StripMenuEnt.ForeColor = Color.Blue;            }            else            { 回车多行EToolStripMenuItem.Checked = true;            StripMenuEnt.Text = "回车多行";            StripMenuEnt.ForeColor = Color.Purple;            }        }        private void 自动保存SToolStripMenuItem_Click(object sender, EventArgs e)        {            AuSaveD();        }        /// <summary> --自动保存--        ///  用户自定义  声明的--自动保存--方法        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void AuSaveD()        {            int sj;            string str1 = toolStripComboBox1.Text;            sj = Convert.ToInt32(str1);            //sj = int.Parse(str1);            if (自动保存SToolStripMenuItem.Checked == true)            {                自动保存SToolStripMenuItem.Checked = true;                保存模式toStabel.Text = "自动模式：";                保存模式toStabel.ForeColor = Color.Purple;  //紫色                timer2.Interval = sj * 60000;                timer2.Enabled = true;            }            else            {                自动保存SToolStripMenuItem.Checked = false; timer2.Enabled = false;                保存模式toStabel.Text = "手动模式：";                保存模式toStabel.ForeColor = Color.Black; //黑色            }        }        // 自动保存        private void SaveButton_Click(object sender, EventArgs e)        {            if (自动保存SToolStripMenuItem.Checked == false)            {                自动保存SToolStripMenuItem.Checked = true;                AuSaveD();            }            else            {                自动保存SToolStripMenuItem.Checked = false;                保存模式toStabel.Text = "手动模式：";                保存模式toStabel.ForeColor = Color.Black;  //黑色                timer2.Enabled = false;            }        }        private void timer2_Tick(object sender, EventArgs e)        {            if (自动保存SToolStripMenuItem.Checked == true && b == true)            {                Save();            }        }        private void 显示时间DToolStripMenuItem_Click(object sender, EventArgs e)        {            if (显示时间DToolStripMenuItem.Checked != true)            { 时间toStrMenItem.Text = "时间："; }            //else { 显示时间DToolStripMenuItem.Checked = true; }        }        // 工具栏点击显示时间        private void SjDataButton_Click(object sender, EventArgs e)        {            if (显示时间DToolStripMenuItem.Checked == false)            { 显示时间DToolStripMenuItem.Checked = true; }            else { 显示时间DToolStripMenuItem.Checked = false;            时间toStrMenItem.Text = "时间：";            }        }        #endregion --         #region -- 菜单中的 -- 帮助菜单        private void 内容CToolStripMenuItem_Click(object sender, EventArgs e)        {        }        private void 关于AToolStripMenuItem_Click(object sender, EventArgs e)        {        }        private void 帮助LToolStripButton_Click(object sender, EventArgs e)        {        }        #endregion --         //  保存状态        private void timer1_Tick(object sender, EventArgs e)        {            if (显示时间DToolStripMenuItem.Checked == true)            {                时间toStrMenItem.Text = "时间：" + System.DateTime.Now.ToString();            }            if (s == true)//状态栏中的判断            {                保存toStabel.Text = "已保存";                保存toStabel.ForeColor = Color.Black;            }            else            { 保存toStabel.Text = "未保存"; 保存toStabel.ForeColor = Color.Purple; }        }        #region --为其他 Form 打开关联 --        /// <summary>关联 formFind.cs        /// 关联 formFind.cs        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        public RichTextBox RichTxtBox        {            get            { return txtInput; }            set            { txtInput = value; }        }        #endregion        //退出前询问        private void Form1_FormClosing(object sender, FormClosingEventArgs e)        {            if (s == false) //判断文件是否为未保存            {                if (e.CloseReason == CloseReason.UserClosing)                {                    DialogResult r = MessageBox.Show(                        "文件内容已发生改变，\n确定要退出程序？",                        "温馨提示 - Mxdr记事本",                        MessageBoxButtons.OKCancel,                        MessageBoxIcon.Question);                    if (r != DialogResult.OK)                    {                        e.Cancel = true; //如果对话框点击的不是"OK",取消本次退出                    }                }            }        }        //按下并释放键时发生--回车事件--        private void txtInput_KeyPress(object sender, KeyPressEventArgs e)        {            if (回车多行EToolStripMenuItem.Checked == true)            {                if (e.KeyChar == (char)13)                {                    string s = txtInput.Text;  //.Text;//实例化                    int ls = txtInput.SelectionStart;//获得文本框中光标位置                    s = s.Insert(ls, "\r\n    ");//在光标后面要插入字符串                    txtInput.Text = s;//在光标后面插入字符串                    //插入字符串后，光标要放在后面还是前面（+光标放在后面，数字要把光标移动的位置）                    txtInput.Focus();//获得焦点                    txtInput.SelectionStart = ls + 5;                    this.txtInput.ScrollToCaret();                }            }        }        //窗体装载        private void Form1_Load(object sender, EventArgs e)        {            timer1.Enabled = true;//开启计时器            Point point;            point = new Point(0, 24);            工具栏ToolStripMenuItem.Checked = false;            toolStrip1.Visible = false;            txtInput.Location = point;            txtInput.Height += toolStrip1.Height;            toolStripComboBox1.SelectedIndex = 2;//设置保存时间默认项        }        //文本框改变后发生        private void txtInput_TextChanged(object sender, EventArgs e)        {            this.calculate();        }        #region 自定义函数 获得汉字、字母、数字、符号        /// <summary>  统计文本中的 -- 数字、字母、汉字、符号 --        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void calculate()        {            bool skipSpace = true;            int cnt1 = 0, cnt2 = 0, cnt3 = 0, cnt4 = 0;            int cnt5, cnt6;            if (txtInput.Text.Length <= 0) { s = true; }            else             if (this.txtInput.Text != null)            {                string sLine;                string ls = txtInput.Text;                if (skipSpace)                {                    sLine = ls.Replace("　?", "").Replace(" ", "").Replace("\t", "").Replace("\n", "").Replace("\r", "");                    cnt2 += getByteLength(sLine);  //字节数量（不含" ","\t","\n","\r","　?"）                    cnt1 += getWordLength(sLine);  //字数                    cnt3 += getdigitalLength(sLine);  //数字数量                    cnt4 += getcharLength(sLine);   //字母数量                    cnt5 = cnt2 - cnt1;  //汉字数量                    cnt6 = cnt2 - cnt3 - cnt4 - cnt5 * 2;  //符号数量                    //读取字符数                    大小toStabel.Text = "大小：" + ((txtInput.Text.Length + (cnt2 - cnt1))).ToString() + "KB";                    计数toStabel.Text = "其中：" + cnt6.ToString() + "/符号，" +                        cnt4.ToString() + "/字母，" + cnt3.ToString() + "/数字，" +                        cnt5.ToString() + "/汉字 =" + cnt1.ToString() + "字";                }                s = false;            }        }        /// <summary> 返回字数        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private int getWordLength(string s)        {            if (s != null)                return s.Length;            else                return 0;        }        /// <summary>  返回数字（0~9）字数数量        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private int getdigitalLength(string s)        {            int lx = 0;            char[] q = s.ToCharArray();            for (int i = 0; i < q.Length; i++)            {                if ((int)q[i] >= 48 && (int)q[i] <= 57)                {                    lx += 1;                }            }            return lx;        }        /// <summary> 返回字母（A~Z-a~z）字数数量        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private int getcharLength(string s)        {            int lz = 0;            char[] q = s.ToLower().ToCharArray();            for (int i = 0; i < q.Length; i++)            {                if ((int)q[i] >= 97 && (int)q[i] <= 122)                {                    lz += 1;                }            }            return lz;        }        /// <summary> 返回字节数        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private int getByteLength(string s)        {            int lh = 0;            char[] q = s.ToCharArray();            for (int i = 0; i < q.Length; i++)            {                if ((int)q[i] >= 0x4E00 && (int)q[i] <= 0x9FA5) // 汉字                {                    lh += 2;                }                else                {                    lh += 1;                }            }            return lh;        }        #endregion        #region  //--richTextBox1 文本中的右键菜单--剪切-复制-粘贴-关闭窗口--        private void 剪切XToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Cut();        }        private void 复制CToolStripMenuItem1_Click(object sender, EventArgs e)        {            this.txtInput.Copy();        }        private void 粘贴VToolStripMenuItem_Click(object sender, EventArgs e)        {            this.txtInput.Paste();        }        private void 撤消toolStripMenuItem5_Click_1(object sender, EventArgs e)        {            this.txtInput.Undo();        }        private void 全选ToolStripMenuItem_Click_1(object sender, EventArgs e)        {            this.txtInput.SelectAll();        }        private void 删除toolStripMenuItem7_Click(object sender, EventArgs e)        {            this.txtInput.Text = txtInput.Text.Remove(txtInput.SelectionStart,                txtInput.SelectionLength);        }        private void 关闭窗口ToolStripMenuItem_Click(object sender, EventArgs e)        {            this.Close();        }        #endregion    }}

查找-替换窗体：如下图所示，除了TextBox1、区分大小写、开启替换、方向和退出 启用外，其他都禁用。

TextBox1输入文本后，查找按键启用，如果要替换，勾选《开启替换》。

formFind.cs 代码：(里面的代码只是简略写一下，大小写的功能可以自己添加)

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Notepad{    public partial class formFind : Form    {        public formFind()        {            InitializeComponent();        }        private void formFind_Load(object sender, EventArgs e)        {            text = ((Form1)this.Owner).RichTxtBox.Text;            inout2 = text.Length;            radioButton2.Checked = true;        }        string text = string.Empty;        string f1 = string.Empty;        public int a, b;        public int inout1 = 0;        public int inout2 = 0; //inout2 要放在Load赋值        private void checkBox2_CheckedChanged(object sender, EventArgs e)        {            if (checkBox2.Checked == true)            {                textBox2.Enabled = true;            }        }        private void button1_Click(object sender, EventArgs e)        {            if (checkBox1.Checked == false) //是否区分大小写            {                MatchSize();            }            if (radioButton2.Checked == true)            {                DownSeek();            }            if (radioButton1.Checked == true)//向上查找            {                UpSeek();            }        }        private void button2_Click(object sender, EventArgs e)        {            replace();        }        private void button3_Click(object sender, EventArgs e)        {            if (checkBox1.Checked == false)  //是否区分大小写            {                MatchSize();            }            //if (radioButton2.Checked == true)  //向下查找            //{            //Form1 f1 = (Form1)this.Owner;            //string f1_text = f1.RichTextBox1.Text;            inout1 = 0; a = 0;            a = text.IndexOf(textBox1.Text, inout1);            for (int i = 0; i < a; i++)            {                DownSeek();                replace();            }        }        //关闭窗口        private void button4_Click(object sender, EventArgs e)        {            this.Close();        }        //区分大小写        private void checkBox1_CheckedChanged(object sender, EventArgs e)        {            if (checkBox1.Checked == true)            {                MatchSize();            }        }        private void textBox1_TextChanged(object sender, EventArgs e)        {            button1.Enabled = true;        }        private void textBox2_TextChanged(object sender, EventArgs e)        {            button2.Enabled = true; button3.Enabled = true;        }        #region  自定义的--查找----替换--        /// <summary> 区分大小写        /// 转换为小写定义        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void MatchSize()        {            Form1 f1 = (Form1)this.Owner;            string f1_text = f1.RichTxtBox.Text;            f1_text = f1_text.ToLower();//文本转换为小写            textBox1.Text = textBox1.Text.ToLower(); //查找内容转换小写            //textBox2.Text = textBox2.Text.ToLower(); //替换字符转换为小写        }        /// <summary> -向下查找-        ///   自定义向下查找字符串 -向下查找-        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void DownSeek()        {            b = text.Length;            inout2 = text.Length;            Form1 f1 = (Form1)this.Owner;            string f1_text = f1.RichTxtBox.Text;            //inout1 = 0;            a = f1_text.IndexOf(textBox1.Text, inout1); //向下查找            if (a >= 0)            {                f1.RichTxtBox.Select(a, textBox1.Text.Length);                f1.RichTxtBox.Focus();                inout1 = ++a;            }            else            {                MessageBox.Show(this.Owner,                    "查找不到" + "\"" + textBox1.Text + "\"",                    "-Mxdr记事本",                    MessageBoxButtons.OK,                    MessageBoxIcon.Asterisk,                    MessageBoxDefaultButton.Button1);                //return;                a = 0;                inout1 = 0;            }        }        /// <summary> --向上查找--        ///   自定义向上查找字符串 --向上查找--        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void UpSeek()        {            a = 0;            inout1 = 0;            Form1 f1 = (Form1)this.Owner;            string f1_text = f1.RichTxtBox.Text;            //inout2 = 0;            b = f1_text.LastIndexOf(textBox1.Text, inout2);            if (b >= 0)            {                f1.RichTxtBox.Select(b, textBox1.Text.Length);                f1.RichTxtBox.Focus();                inout2 = --b;            }            else            {                MessageBox.Show(this.Owner,                    "查找不到" + "\"" + textBox1.Text + "\"",                    "-Mxdr记事本",                    MessageBoxButtons.OK,                    MessageBoxIcon.Asterisk,                    MessageBoxDefaultButton.Button1);                //return;                b = text.Length;                inout2 = text.Length;            }        }        /// <summary>  --替换--自定义        /// --替换--  自定义替换字符串        /// </summary>        /// <param name="s"></param>        /// <returns></returns>        private void replace()        {            Form1 f1 = (Form1)this.Owner;            if (f1.RichTxtBox.SelectedText.Length > 0)                f1.RichTxtBox.SelectedText = this.textBox2.Text;//textBox2中放要替换的字符        }        #endregion    }}

希望这对你有用！！！