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這篇文章主要介紹C#如何實現記事本查找與替換功能，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
先上效果圖
定義全局變量
#region =★*★*★= 〖查找替換〗的自定義變量 =★*★*★= /// <summary> 獲取或設置查找起始位置 </summary> static int Index = 0; /// <summary> 查找到的字符串數量 </summary> static int count = 0; /// <summary> 查找字符是否變更 static string strE = string.Empty; /// <summary> 記錄原始光標位置 </summary> static int MemoIndex = -1; /// <summary> 過度字符串變量 </summary> static string str = string.Empty; /// <summary> 實例化富文本 </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〗(不區分大小寫)<para> <para>
/// 參數1(rbox):內容文本框,指定為 RichTextBox 文本框類型<para>
/// 參數2(str):用戶指定要查找的字符串</para>
/// </para></para> </summary>
/// <param name="rbox">內容文本框,指定為 RichTextBox 文本框類型</param>
/// <param name="str">用戶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);//設定關鍵字為顏色
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>
/// 參數1(rbox):內容文本框,指定為 RichTextBox 文本框類型 <para></para>
/// 參數2(FindStr):用戶指定要查找的字符串<para></para>
/// 參數3(TrueFales):bool 真:限定大小寫 假:不分大小寫</summary>
/// <param name="rbox">內容文本框,指定為 RichTextBox 文本框類型</param>
/// <param name="FindStr">用戶指定要查找的字符串</param>
/// <param name="TrueFales">bool 真:限定大小寫 假:不分大小寫</param>
public static void FindDown(RichTextBox rtxt, string FindStr,bool TrueFales)
{
if (TrueFales)
fileFindDownMax(rtxt, FindStr);
else
fileFindDownMin(rtxt, FindStr);
}
#endregion
#region =★*★*★= 簡單的從上到下查找 =★*★*★=
/// <summary>向下查找指定〖字符 或 字符串〗(限定大小寫)<para> <para>
/// 參數1(rbox):內容文本框,指定為 RichTextBox 文本框類型
/// <para>參數2(FindStr):用戶指定要查找的字符串</para>
/// </para></para> </summary>
/// <param name="rbox">內容文本框,指定為 RichTextBox 文本框類型</param>
/// <param name="FindStr">用戶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);//設定關鍵字為顏色
Index += FindStr.Length;
rtxt.Focus();
}
}
/// <summary>向下查找指定〖字符 或 字符串〗(不區分大小寫)<para> <para>
/// 參數1(rbox):內容文本框,指定為 RichTextBox 文本框類型
/// <para>參數2(FindStr):用戶指定要查找的字符串</para>
/// </para></para> </summary>
/// <param name="rbox">內容文本框,指定為 RichTextBox 文本框類型</param>
/// <param name="FindStr">用戶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);//設定關鍵字為顏色
Index += FindStr.Length;
rtxt.Focus();
}
}
#endregion
//* 類似 VS 的查找方法 */
#region =★*★*★= 類似 VS 的查找方法 =★*★*★=
/// <summary> 類似 VS 的查找方法(不區分大小寫向下查找)<para> </para>
/// 參數1(txt):RichTextBox文本框<para></para>
/// 參數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);//截取光標位置 + 查找字符數 - 1 位數
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);//設定關鍵字為顏色
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);//設定關鍵字為顏色
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控件中搜索關鍵字
Index += FindString.Length;//遞增標識查詢關鍵字的初始長度
myColor(rtxt);//設定關鍵字為顏色
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);//設定關鍵字為顏色
Index += FindString.Length;//遞增標識查詢關鍵字的初始長度
rtxt.Focus();
count++;
}
else
{
seeks(FindString);
MemoIndex = -1;
Index = 0;
count = 0;
}
}
}
/// <summary> 類似 VS 的查找方法(不區分大小寫向下查找)<para> </para>
/// 參數1(txt):RichTextBox文本框<para></para>
/// 參數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);//設定關鍵字為顏色
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);//設定關鍵字為顏色
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控件中搜索關鍵字
Index += FindString.Length;//遞增標識查詢關鍵字的初始長度
myColor(rtxt);//設定關鍵字為顏色
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);//設定關鍵字為顏色
Index += FindString.Length;//遞增標識查詢關鍵字的初始長度
rtxt.Focus();
count++;
}
else
{
seeks(FindString);
MemoIndex = -1;
Index = 0;
count = 0;
}
}
}
#endregion替換 與 全部替換(功能不是很全)
#region =★*★*★= 〖替換〗與〖全部替換〗 =★*★*★=
#region =★*★*★= 單次替換字符串 =★*★*★=
/// <summary> 替換 </summary>
/// <param name="rtxt">RichTextBox</param>
/// <param name="FindString">查找字符串</param>
/// <param name="ReplString">替換字符串</param>
/// <param name="TrueFalse">(bool值)區分大小寫<para> </para>真:區分<para></para>假:不區分</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中放要替換的字符
rtxt.Focus();
MemoIndex = -1;
rtxt.SelectionStart += cs;
}
FindDown(rtxt, FindString, TrueFalse);
}
#region =★*★*★= 替換字符串 =★*★*★=
/// <summary>替換字符串<para> </para>
/// 參數1(FindString):查找的內容<para></para>
/// 參數2(ReplString):要替換的內容 </summary>
/// <param name="FindString">查找的內容</param>
/// <param name="ReplString">要替換的內容</param>
private static void replace(RichTextBox rtxt, string FindString, string ReplString)
{
rtxt.SelectionLength = FindString.Length;
rtxt.SelectedText = ReplString;//textBox2中放要替換的字符
Index = rtxt.SelectionStart;//獲取或設置光標選定位置
}
#endregion
#endregion
#region =★*★*★= 〖全部替換〗 =★*★*★=
/// <summary> 全部替換<para> </para>
/// 參數1(txt):RichTextBox 文本框<para></para>
/// 參數2(FindString):查找字符串<para></para>
/// 參數3(ReplString):替換字符串<para></para>
/// 參數4(trueFales):bool 真：區分大小寫，假：不區分大小寫</summary>
/// <param name="txt">RichTextBox 文本框</param>
/// <param name="FindString">查找字符串</param>
/// <param name="ReplString">替換字符串</param>
/// <param name="trueFales">bool 真：區分大小寫，假：不區分大小寫</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 =★*★*★= 全部替換(區分/不區分大小寫) =★*★*★=
/// <summary> 全部替換(區分大小寫) </summary>
/// <param name="rtxt">RichTextBox 文本框</param>
/// <param name="FindStr">查找字符串</param>
/// <param name="ReplStr">替換字符串</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("查找結束，已經為您找到{0}個結果。", count),
"查找結果-Mxdr溫馨提示!!", 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> 全部替換(不區分大小寫) </summary>
/// <param name="rtxt">RichTextBox 文本框</param>
/// <param name="FindStr">查找字符串</param>
/// <param name="ReplStr">替換字符串</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("查找結束，已經為您找到{0}個結果。", count),
"查找結果-Mxdr溫馨提示!!", 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消息彈窗
#region =★*★*★= 消息提示,提示用戶查找結果 =★*★*★=
/// <summary> 消息提示,提示用戶查找結果<para> <para>
/// 參數1(str):用戶指定要查找的字符串</para></para> </summary>
/// <param name="str">用戶指定要查找的字符串</param>
public static void seeks(string str)
{
if (count != 0)
MessageBox.Show(string.Format("已查找完畢,共〖{0}〗個 \"{1}\"!", count, str), "查找結果-Mxdr溫馨提示!!");
else MessageBox.Show(string.Format("沒有查找到 \"{0}\"!", str), "查找 - Mxdr溫馨提示!");
}
#endregion查找字符著色
#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;
}
#endregionC#是一個簡單、通用、面向對象的編程語言，它由微軟Microsoft開發，繼承了C和C++強大功能，并且去掉了一些它們的復雜特性，C#綜合了VB簡單的可視化操作和C++的高運行效率，以其強大的操作能力、優雅的語法風格、創新的語言特性和便捷的面向組件編程從而成為.NET開發的首選語言，但它不適用于編寫時間急迫或性能非常高的代碼，因為C#缺乏性能極高的應用程序所需要的關鍵功能。
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