看了网上关于记事本的查找替换很多，但都没有达到我想要的结果，然后自己学习总结了以下的方法：

统计字符串(汉字,字母,数字,字符)

先上效果图

定义全局变量

#region =★*★*★= 〖查找替换〗的自定义变量 =★*★*★= /// <summary> 获取或设置查找起始位置 </summary> static int Index = 0; /// <summary> 查找到的字符串数量 </summary> static int count = 0; /// <summary> 查找字符是否变更 static string strE = string.Empty; /// <summary> 记录原始光标位置 </summary> static int MemoIndex = -1; /// <summary> 过度字符串变量 </summary> static string str = string.Empty; /// <summary> 实例化富文本 </summary> static RichTextBox r = new RichTextBox(); #endregion

向上查找

#region =★*★*★= FindUp() 查找指定〖字符 或 字符串〗 =★*★*★= /// <summary>向上查找指定〖字符 或 字符串〗(不区分大小写)<para>　<para> /// 参数1(rbox):内容文本框,指定为 RichTextBox 文本框类型<para> /// 参数2(str):用户指定要查找的字符串</para> /// </para></para> </summary> /// <param name="rbox">内容文本框,指定为 RichTextBox 文本框类型</param> /// <param name="str">用户指定要查找的字符串</param> public static void FindUp(RichTextBox rtxt, string str) { if (strE != str) { rtxt.SelectionStart = rtxt.Text.Length; strE = str; } Index = rtxt.SelectionStart; Index = rtxt.Find(str, 0, Index, RichTextBoxFinds.Reverse); if (Index >= 0) { rtxt.SelectionStart = Index; rtxt.SelectionLength = str.Length; count++; rtxt.Focus(); myColor(rtxt);//设定关键字为颜色 if (Index <= 0) { seeks(str); count = 0; } } else if (Index < 0) { seeks(str); count = 0; } } #endregion

向下查找

#region =★*★*★= FindDown() 查找指定〖字符 或 字符串〗=★*★*★= /// <summary>向下 查找指定〖字符 或 字符串〗<para>　</para> /// 参数1(rbox):内容文本框,指定为 RichTextBox 文本框类型 <para></para> /// 参数2(FindStr):用户指定要查找的字符串<para></para> /// 参数3(TrueFales):bool 真:限定大小写 假:不分大小写</summary> /// <param name="rbox">内容文本框,指定为 RichTextBox 文本框类型</param> /// <param name="FindStr">用户指定要查找的字符串</param> /// <param name="TrueFales">bool 真:限定大小写 假:不分大小写</param> public static void FindDown(RichTextBox rtxt, string FindStr,bool TrueFales) { if (TrueFales) fileFindDownMax(rtxt, FindStr); else fileFindDownMin(rtxt, FindStr); } #endregion #region =★*★*★= 简单的从上到下查找 =★*★*★= /// <summary>向下查找指定〖字符 或 字符串〗(限定大小写)<para>　<para> /// 参数1(rbox):内容文本框,指定为 RichTextBox 文本框类型 /// <para>参数2(FindStr):用户指定要查找的字符串</para> /// </para></para> </summary> /// <param name="rbox">内容文本框,指定为 RichTextBox 文本框类型</param> /// <param name="FindStr">用户指定要查找的字符串</param> private static void FindDownmax(RichTextBox rtxt, string FindStr) { Index = rtxt.Find(FindStr, Index, RichTextBoxFinds.MatchCase); if (Index < 0 || Index > rtxt.Text.Length) { seeks(FindStr); count = 0; Index = 0; } else { rtxt.Select(Index, FindStr.Length); myColor(rtxt);//设定关键字为颜色 Index += FindStr.Length; rtxt.Focus(); } } /// <summary>向下查找指定〖字符 或 字符串〗(不区分大小写)<para>　<para> /// 参数1(rbox):内容文本框,指定为 RichTextBox 文本框类型 /// <para>参数2(FindStr):用户指定要查找的字符串</para> /// </para></para> </summary> /// <param name="rbox">内容文本框,指定为 RichTextBox 文本框类型</param> /// <param name="FindStr">用户指定要查找的字符串</param> private static void FindDownMin(RichTextBox rtxt, string FindStr) { Index = rtxt.Find(FindStr, Index, RichTextBoxFinds.None); if (Index < 0 || Index > rtxt.Text.Length) { seeks(FindStr); count = 0; Index = 0; } else { rtxt.Select(Index, FindStr.Length); myColor(rtxt);//设定关键字为颜色 Index += FindStr.Length; rtxt.Focus(); } } #endregion / #region =★*★*★= 类似 VS 的查找方法 =★*★*★= /// <summary> 类似 VS 的查找方法(不区分大小写向下查找)<para>　</para> /// 参数1(txt):RichTextBox文本框<para></para> /// 参数2(FindString):查找字符串</summary> /// <param name="txt">RichTextBox文本框</param> /// <param name="FindString">查找字符串</param> private static void fileFindDownMax(RichTextBox rtxt, string FindString) { if (MemoIndex < 0) { MemoIndex = rtxt.SelectionStart; if (MemoIndex > 10 && MemoIndex + FindString.Length <= rtxt.Text.Length) { str = rtxt.Text.Substring(0, MemoIndex + FindString.Length - 1);//截取光标位置 + 查找字符数 - 1 位数 Index = rtxt.SelectionStart; r.Text = str; } else { str = rtxt.Text; r.Text = rtxt.Text; Index = rtxt.SelectionStart; } } if (Index < str.Length - (FindString.Length - 1) && Index >= 0) { Index = r.Find(FindString, Index, RichTextBoxFinds.None); if (Index < 0 || Index > r.Text.Length) { seeks(FindString); count = 0; Index = 0; MemoIndex = -1; } else { rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); count++; Index += FindString.Length; if (Index > str.Length - FindString.Length) { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } } else if (Index < rtxt.Text.Length && Index >= 0) { Index = rtxt.Find(FindString, Index, RichTextBoxFinds.None); if (Index == -1)//(Index >= txt.Text.Length && Index <= 0) { if (r.Text != "") { Index = 0; Index = r.Find(FindString, Index, RichTextBoxFinds.None); if (Index < 0 || Index > r.Text.Length) { seeks(FindString); count = 0; Index = 0; MemoIndex = -1; } else { rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); Index += FindString.Length; count++; if (Index > str.Length - FindString.Length) { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } } else { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } else { rtxt.Select(Index, FindString.Length);//在RichTextBox控件中搜索关键字 Index += FindString.Length;//递增标识查询关键字的初始长度 myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); count++; } } else { Index = 0; Index = r.Find(FindString, Index, RichTextBoxFinds.None); if (Index < r.Text.Length - FindString.Length && Index >= 0) { r.Select(Index, FindString.Length); rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 Index += FindString.Length;//递增标识查询关键字的初始长度 rtxt.Focus(); count++; } else { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } } /// <summary> 类似 VS 的查找方法(不区分大小写向下查找)<para>　</para> /// 参数1(txt):RichTextBox文本框<para></para> /// 参数2(FindString):查找字符串</summary> /// <param name="txt">RichTextBox文本框</param> /// <param name="FindString">查找字符串</param> private static void fileFindDownMin(RichTextBox rtxt, string FindString) { if (MemoIndex < 0) { MemoIndex = rtxt.SelectionStart; if (MemoIndex > 10 && MemoIndex + FindString.Length <= rtxt.Text.Length) { str = rtxt.Text.Substring(0, MemoIndex + FindString.Length - 1); Index = rtxt.SelectionStart; r.Text = str; } else { str = rtxt.Text; r.Text = rtxt.Text; Index = rtxt.SelectionStart; } } if (Index < str.Length - (FindString.Length - 1) && Index >= 0) { Index = r.Find(FindString, Index, RichTextBoxFinds.MatchCase); if (Index < 0 || Index > r.Text.Length) { seeks(FindString); count = 0; Index = 0; MemoIndex = -1; } else { rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); count++; Index += FindString.Length; if (Index > str.Length - FindString.Length) { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } } else if (Index < rtxt.Text.Length && Index >= 0) { Index = rtxt.Find(FindString, Index, RichTextBoxFinds.MatchCase); if (Index == -1) { if (r.Text != "") { Index = 0; Index = r.Find(FindString, Index, RichTextBoxFinds.MatchCase); if (Index < 0 || Index > r.Text.Length) { seeks(FindString); count = 0; Index = 0; MemoIndex = -1; } else { rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); Index += FindString.Length; count++; if (Index > str.Length - FindString.Length) { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } } else { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } else { rtxt.Select(Index, FindString.Length);//在RichTextBox控件中搜索关键字 Index += FindString.Length;//递增标识查询关键字的初始长度 myColor(rtxt);//设定关键字为颜色 rtxt.Focus(); count++; } } else { Index = 0; Index = r.Find(FindString, Index, RichTextBoxFinds.MatchCase); if (Index < r.Text.Length - FindString.Length && Index >= 0) { r.Select(Index, FindString.Length); rtxt.Select(Index, FindString.Length); myColor(rtxt);//设定关键字为颜色 Index += FindString.Length;//递增标识查询关键字的初始长度 rtxt.Focus(); count++; } else { seeks(FindString); MemoIndex = -1; Index = 0; count = 0; } } }#endregion

替换 与 全部替换(功能不是很全)

#region =★*★*★= 〖替换〗与〖全部替换〗 =★*★*★= #region =★*★*★= 单次替换字符串 =★*★*★= /// <summary> 替换 </summary> /// <param name="rtxt">RichTextBox</param> /// <param name="FindString">查找字符串</param> /// <param name="ReplString">替换字符串</param> /// <param name="TrueFalse">(bool值)区分大小写<para>　</para>真:区分<para></para>假:不区分</param> public static void replaces(RichTextBox rtxt, string FindString, string ReplString, bool TrueFalse) { string txtSt = rtxt.SelectedText; if (FindString.Equals(txtSt)) { int fs = FindString.Length; int rs = ReplString.Length; int cs = fs - rs; rtxt.SelectionLength = FindString.Length; rtxt.SelectionColor = Color.Coral; rtxt.SelectedText = ReplString;//textBox2中放要替换的字符 rtxt.Focus(); MemoIndex = -1; rtxt.SelectionStart += cs; } FindDown(rtxt, FindString, TrueFalse); } #region =★*★*★= 替换字符串 =★*★*★= /// <summary>替换字符串<para>　</para> /// 参数1(FindString):查找的内容<para></para> /// 参数2(ReplString):要替换的内容 </summary> /// <param name="FindString">查找的内容</param> /// <param name="ReplString">要替换的内容</param> private static void replace(RichTextBox rtxt, string FindString, string ReplString) { rtxt.SelectionLength = FindString.Length; rtxt.SelectedText = ReplString;//textBox2中放要替换的字符 Index = rtxt.SelectionStart;//获取或设置光标选定位置 } #endregion #endregion #region =★*★*★= 〖全部替换〗 =★*★*★= /// <summary> 全部替换<para>　</para> /// 参数1(txt):RichTextBox 文本框<para></para> /// 参数2(FindString):查找字符串<para></para> /// 参数3(ReplString):替换字符串<para></para> /// 参数4(trueFales):bool 真：区分大小写，假：不区分大小写</summary> /// <param name="txt">RichTextBox 文本框</param> /// <param name="FindString">查找字符串</param> /// <param name="ReplString">替换字符串</param> /// <param name="trueFales">bool 真：区分大小写，假：不区分大小写</param> public static void ReplAll(RichTextBox rtxt, string FindString, string ReplString, bool trueFales) { if (trueFales) onDistinCase(rtxt, FindString, ReplString); else offDistinCase(rtxt, FindString, ReplString); } #region =★*★*★= 全部替换(区分/不区分大小写) =★*★*★= /// <summary> 全部替换(区分大小写) </summary> /// <param name="rtxt">RichTextBox 文本框</param> /// <param name="FindStr">查找字符串</param> /// <param name="ReplStr">替换字符串</param> private static void onDistinCase(RichTextBox rtxt, string FindStr, string ReplStr) { while (Index >= 0 || Index <= rtxt.Text.Length) { int cot = FindStr.Length - ReplStr.Length; Index = rtxt.Find(FindStr, Index, RichTextBoxFinds.MatchCase); if (Index < 0 || Index > rtxt.Text.Length) { DialogResult r = MessageBox.Show(string.Format("查找结束，已经为您找到{0}个结果。", count), "查找结果-Mxdr温馨提示!!", MessageBoxButtons.OK, MessageBoxIcon.Warning); if (r == DialogResult.Yes) count = 0; Index = 0; break; } else { rtxt.Select(Index, FindStr.Length); replace(rtxt, FindStr, ReplStr); Index += FindStr.Length; count++; } } } /// <summary> 全部替换(不区分大小写) </summary> /// <param name="rtxt">RichTextBox 文本框</param> /// <param name="FindStr">查找字符串</param> /// <param name="ReplStr">替换字符串</param> private static void offDistinCase(RichTextBox rtxt, string FindStr, string ReplStr) { while (Index >= 0 || Index <= rtxt.Text.Length) { int cot = FindStr.Length - ReplStr.Length; Index = rtxt.Find(FindStr, Index, RichTextBoxFinds.None); if (Index < 0 || Index > rtxt.Text.Length) { DialogResult r = MessageBox.Show(string.Format("查找结束，已经为您找到{0}个结果。", count), "查找结果-Mxdr温馨提示!!", MessageBoxButtons.OK, MessageBoxIcon.Warning); if (r == DialogResult.Yes) count = 0; Index = 0; break; } else { rtxt.Select(Index, FindStr.Length); replace(rtxt, FindStr, ReplStr); Index += FindStr.Length; count++; } } } #endregion #endregion #endregion

消息弹窗

#region =★*★*★= 消息提示,提示用户查找结果 =★*★*★= /// <summary> 消息提示,提示用户查找结果<para>　<para> /// 参数1(str):用户指定要查找的字符串</para></para> </summary> /// <param name="str">用户指定要查找的字符串</param> public static void seeks(string str) { if (count != 0) MessageBox.Show(string.Format("已查找完毕,共〖{0}〗个 \"{1}\"!", count, str), "查找结果-Mxdr温馨提示!!"); else MessageBox.Show(string.Format("没有查找到 \"{0}\"!", str), "查找 - Mxdr温馨提示!"); } #endregion

查找字符着色

#region =★*★*★= 查找字符上色 =★*★*★= /// <summary> 查找字符上色 </summary> /// <param name="rtxt">RichTextBox</param> private static void myColor(RichTextBox rtxt) { rtxt.SelectionColor = Color.Coral; } #endregion

以上都为个人的理解，有不全的地方请各位能指点迷津。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。