StringHelper类
base64编码
/// </summary> /// <param name="input">字符串</param>
/// <returns>base64编码串</returns> public static string Base64StringEncode(string input)
{ byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(input); return Convert.ToBase64String(encbuff); } /// <summary> /// 对字符串进行反编码 /// </summary> /// <param name="input">base64编码串</param> /// <returns>字符串</returns> public static string Base64StringDecode(string input) { byte[] decbuff = Convert.FromBase64String(input); return System.Text.Encoding.UTF8.GetString(decbuff); } /// <summary> /// 替换字符串(忽略大小写) /// </summary> /// <param name="input">要进行替换的内容</param> /// <param name="oldValue">旧字符串</param> /// <param name="newValue">新字符串</param> /// <returns>替换后的字符串</returns> public static string CaseInsensitiveReplace(string input, string oldValue, string newValue) { Regex regEx = new Regex(oldValue, RegexOptions.IgnoreCase | RegexOptions.Multiline); return regEx.Replace(input, newValue); } /// <summary> /// 替换首次出现的字符串 /// </summary> /// <param name="input">要进行替换的内容</param> /// <param name="oldValue">旧字符串</param> /// <param name="newValue">新字符串</param> /// <returns>替换后的字符串</returns> public static string ReplaceFirst(string input, string oldValue, string newValue) { Regex regEx = new Regex(oldValue, RegexOptions.Multiline); return regEx.Replace(input, newValue, 1); } /// <summary> /// 替换最后一次出现的字符串 /// </summary> /// <param name="input">要进行替换的内容</param> /// <param name="oldValue">旧字符串</param> /// <param name="newValue">新字符串</param> /// <returns>替换后的字符串</returns> public static string ReplaceLast(string input, string oldValue, string newValue) { int index = input.LastIndexOf(oldValue); if (index < 0) { return input; } else { StringBuilder sb = new StringBuilder(input.Length - oldValue.Length + newValue.Length); sb.Append(input.Substring(0, index)); sb.Append(newValue); sb.Append(input.Substring(index + oldValue.Length, input.Length - index - oldValue.Length)); return sb.ToString(); } } /// <summary> /// 根据词组过虑字符串(忽略大小写) /// </summary> /// <param name="input">要进行过虑的内容</param> /// <param name="filterWords">要过虑的词组</param> /// <returns>过虑后的字符串</returns> public static string FilterWords(string input, params string[] filterWords) { return StringHelper.FilterWords(input, char.MinValue, filterWords); } /// <summary> /// 根据词组过虑字符串(忽略大小写) /// </summary> /// <param name="input">要进行过虑的内容</param> /// <param name="mask">字符掩码</param> /// <param name="filterWords">要过虑的词组</param> /// <returns>过虑后的字符串</returns> public static string FilterWords(string input, char mask, params string[] filterWords) { string stringMask = mask == char.MinValue ? string.Empty : mask.ToString(); string totalMask = stringMask; foreach (string s in filterWords) { Regex regEx = new Regex(s, RegexOptions.IgnoreCase | RegexOptions.Multiline); if (stringMask.Length > 0) { for (int i = 1; i < s.Length; i++) totalMask += stringMask; } input = regEx.Replace(input, totalMask); totalMask = stringMask; } return input; } public static MatchCollection HasWords(string input, params string[] hasWords) { StringBuilder sb = new StringBuilder(hasWords.Length + 50); //sb.Append("["); foreach (string s in hasWords) { sb.AppendFormat("({0})|", StringHelper.HtmlSpecialEntitiesEncode(s.Trim())); } string pattern = sb.ToString(); pattern = pattern.TrimEnd('|'); // +"]"; Regex regEx = new Regex(pattern, RegexOptions.IgnoreCase | RegexOptions.Multiline); return regEx.Matches(input); } /// <summary> /// Html编码 /// </summary> /// <param name="input">要进行编辑的字符串</param> /// <returns>Html编码后的字符串</returns> public static string HtmlSpecialEntitiesEncode(string input) { return HttpUtility.HtmlEncode(input); } /// <summary> /// Html解码 /// </summary> /// <param name="input">要进行解码的字符串</param> /// <returns>解码后的字符串</returns> public static string HtmlSpecialEntitiesDecode(string input) { return HttpUtility.HtmlDecode(input); } /// <summary> /// MD5加密 /// </summary> /// <param name="input">要进行加密的字符串</param> /// <returns>加密后的字符串</returns> public static string MD5String(string input) { MD5 md5Hasher = MD5.Create(); byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input)); StringBuilder sBuilder = new StringBuilder(); for (int i = 0; i < data.Length; i++) { sBuilder.Append(data[i].ToString("x2")); } return sBuilder.ToString(); } /// <summary> /// 对字符串进行MD5较验 /// </summary> /// <param name="input">要进行较验的字符串</param> /// <param name="hash">散列串</param> /// <returns>是否匹配</returns> public static bool MD5VerifyString(string input, string hash) { string hashOfInput = StringHelper.MD5String(input); StringComparer comparer = StringComparer.OrdinalIgnoreCase; if (0 == comparer.Compare(hashOfInput, hash)) { return true; } else { return false; } } public static string PadLeftHtmlSpaces(string input, int totalSpaces) { string space = " "; return PadLeft(input, space, totalSpaces * space.Length); } public static string PadLeft(string input, string pad, int totalWidth) { return StringHelper.PadLeft(input, pad, totalWidth, false); } public static string PadLeft(string input, string pad, int totalWidth, bool cutOff) { if (input.Length >= totalWidth) return input; int padCount = pad.Length; string paddedString = input; while (paddedString.Length < totalWidth) { paddedString += pad; } // trim the excess. if (cutOff) paddedString = paddedString.Substring(0, totalWidth); return paddedString; } public static string PadRightHtmlSpaces(string input, int totalSpaces) { string space = " "; return PadRight(input, space, totalSpaces * space.Length); } public static string PadRight(string input, string pad, int totalWidth) { return StringHelper.PadRight(input, pad, totalWidth, false); } public static string PadRight(string input, string pad, int totalWidth, bool cutOff) { if (input.Length >= totalWidth) return input; string paddedString = string.Empty; while (paddedString.Length < totalWidth - input.Length) { paddedString += pad; } // trim the excess. if (cutOff) paddedString = paddedString.Substring(0, totalWidth - input.Length); paddedString += input; return paddedString; } /// <summary> /// 去除新行 /// </summary> /// <param name="input">要去除新行的字符串</param> /// <returns>已经去除新行的字符串</returns> public static string RemoveNewLines(string input) { return StringHelper.RemoveNewLines(input, false); } /// <summary> /// 去除新行 /// </summary> /// <param name="input">要去除新行的字符串</param> /// <param name="addSpace">是否添加空格</param> /// <returns>已经去除新行的字符串</returns> public static string RemoveNewLines(string input, bool addSpace) { string replace = string.Empty; if (addSpace) replace = " "; string pattern = @"[/r|/n]"; Regex regEx = new Regex(pattern, RegexOptions.IgnoreCase | RegexOptions.Multiline); return regEx.Replace(input, replace); } /// <summary> /// 字符串反转 /// </summary> /// <param name="input">要进行反转的字符串</param> /// <returns>反转后的字符串</returns> public static string Reverse(string input) { char[] reverse = new char[input.Length]; for (int i = 0, k = input.Length - 1; i < input.Length; i++, k--) { if (char.IsSurrogate(input[k])) { reverse[i + 1] = input[k--]; reverse[i++] = input[k]; } else { reverse[i] = input[k]; } } return new System.String(reverse); } /// <summary> /// 转成首字母大字形式 /// </summary> /// <param name="input">要进行转换的字符串</param> /// <returns>转换后的字符串</returns> public static string SentenceCase(string input) { if (input.Length < 1) return input; string sentence = input.ToLower(); return sentence[0].ToString().ToUpper() + sentence.Substring(1); } /// <summary> /// 空格转换成 /// </summary> /// <param name="input">要进行转换的字符串</param> /// <returns>转换后的字符串</returns> public static string SpaceToNbsp(string input) { string space = " "; return input.Replace(" ", space); } /// <summary> /// 去除"<" 和 ">" 符号之间的内容 /// </summary> /// <param name="input">要进行处理的字符串</param> /// <returns>处理后的字符串</returns> public static string StripTags(string input) { Regex stripTags = new Regex("<(.|/n)+?>"); return stripTags.Replace(input, ""); } public static string TitleCase(string input) { return TitleCase(input, true); } public static string TitleCase(string input, bool ignoreShortWords) { List<string> ignoreWords = null; if (ignoreShortWords) { //TODO: Add more ignore words? ignoreWords = new List<string>(); ignoreWords.Add("a"); ignoreWords.Add("is"); ignoreWords.Add("was"); ignoreWords.Add("the"); } string[] tokens = input.Split(' '); StringBuilder sb = new StringBuilder(input.Length); foreach (string s in tokens) { if (ignoreShortWords == true && s != tokens[0] && ignoreWords.Contains(s.ToLower())) { sb.Append(s + " "); } else { sb.Append(s[0].ToString().ToUpper()); sb.Append(s.Substring(1).ToLower()); sb.Append(" "); } } return sb.ToString().Trim(); } /// <summary> /// 去除字符串内的空白字符 /// </summary> /// <param name="input">要进行处理的字符串</param> /// <returns>处理后的字符串</returns> public static string TrimIntraWords(string input) { Regex regEx = new Regex(@"[/s]+"); return regEx.Replace(input, " "); } /// <summary> /// 换行符转换成Html标签的换行符<br /> /// </summary> /// <param name="input">要进行处理的字符串</param> /// <returns>处理后的字符串</returns> public static string NewLineToBreak(string input) { Regex regEx = new Regex(@"[/n|/r]+"); return regEx.Replace(input, "<br />"); } /// <summary> /// 插入换行符(不中断单词) /// </summary> /// <param name="input">要进行处理的字符串</param> /// <param name="charCount">每行字符数</param> /// <returns>处理后的字符串</returns> public static string WordWrap(string input, int charCount) { return StringHelper.WordWrap(input, charCount, false, Environment.NewLine); } /// <summary> /// 插入换行符 /// </summary> /// <param name="input">要进行处理的字符串</param> /// <param name="charCount">每行字符数</param> /// <param name="cutOff">如果为真，将在单词的中部断开</param> /// <returns>处理后的字符串</returns> public static string WordWrap(string input, int charCount, bool cutOff) { return StringHelper.WordWrap(input, charCount, cutOff, Environment.NewLine); } /// <summary> /// 插入换行符 /// </summary> /// <param name="input">要进行处理的字符串</param> /// <param name="charCount">每行字符数</param> /// <param name="cutOff">如果为真，将在单词的中部断开</param> /// <param name="breakText">插入的换行符号</param> /// <returns>处理后的字符串</returns> public static string WordWrap(string input, int charCount, bool cutOff, string breakText) { StringBuilder sb = new StringBuilder(input.Length + 100); int counter = 0; if (cutOff) { while (counter < input.Length) { if (input.Length > counter + charCount) { sb.Append(input.Substring(counter, charCount)); sb.Append(breakText); } else { sb.Append(input.Substring(counter)); } counter += charCount; } } else { string[] strings = input.Split(' '); for (int i = 0; i < strings.Length; i++) { counter += strings[i].Length + 1; // the added one is to represent the inclusion of the space. if (i != 0 && counter > charCount) { sb.Append(breakText); counter = 0; } sb.Append(strings[i] + ' '); } } return sb.ToString().TrimEnd(); // to get rid of the extra space at the end. } #endregion }
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