| 标题 | C#字符串工具类截取过滤格式判断等 |
| 范文 | C#字符串工具类，实现的功能包括：判断某值是否在枚举内(位枚举)、将全角数字转换为数字、判断是否为IP、获得当前页面客户端的IP、改正sql语句中的转义字符、检测是否是正确的Url、检测是否符合email格式、SQL字符串过滤、按字节数截取字符串(不带省略号)、按字节数截取字符串(后面加省略号...)等。 view sourceprint?001using System; 002using System.Collections.Generic; 003using System.Linq; 004using System.Text; 005using System.Text.RegularExpressions; 006using System.Web; 007namespace CLB.Utility.CharTools 008{ 009 public static class StringHelper 010 { 011 /// <summary> 012 /// 按字节数截取字符串(后面加省略号...) 013 /// </summary> 014 ///<param name="origStr"> 原始字符串</param> 015 ///<param name="endIndex"> 提取前endIdex个字节</param> 016 /// <returns></returns> 017 public static string GetSubString(string origStr, int endIndex) 018 { 019 if (origStr == null || origStr.Length == 0 || endIndex < 0) 020 return ""; 021 int bytesCount = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(origStr); 022 if (bytesCount > endIndex) 023 { 024 int readyLength = 0; 025 int byteLength; 026 for (int i = 0; i < origStr.Length; i++) 027 { 028 byteLength = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(new char[] { origStr[i] }); 029 readyLength += byteLength; 030 if (readyLength == endIndex) 031 { 032 origStr = origStr.Substring(0, i + 1) + "..."; 033 break; 034 } 035 else if (readyLength > endIndex) 036 { 037 origStr = origStr.Substring(0, i) + "..."; 038 break; 039 } 040 } 041 } 042 return origStr; 043 } 044 /// <summary> 045 /// 按字节数截取字符串(不带省略号) 046 /// </summary> 047 /// <param name="origStr"> 原始字符串</param> 048 /// <param name="endIndex"> 提取前endIdex个字节</param> 049 /// <returns></returns> 050 public static string GetSub1String(string origStr, int endIndex) 051 { 052 if (origStr == null || origStr.Length == 0 || endIndex < 0) 053 return ""; 054 int bytesCount = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(origStr); 055 if (bytesCount > endIndex) 056 { 057 int readyLength = 0; 058 int byteLength; 059 for (int i = 0; i < origStr.Length; i++) 060 { 061 byteLength = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(new char[] { origStr[i] }); 062 readyLength += byteLength; 063 if (readyLength == endIndex) 064 { 065 origStr = origStr.Substring(0, i + 1); 066 break; 067 } 068 else if (readyLength > endIndex) 069 { 070 origStr = origStr.Substring(0, i); 071 break; 072 } 073 } 074 } 075 return origStr; 076 } 077 /// <summary> 078 /// SQL字符串过滤 079 /// </summary> 080 /// <param name="Str"></param> 081 /// <returns></returns> 082 public static bool ProcessSqlStr(string Str) 083 { 084 bool ReturnValue = true; 085 try 086 { 087 if (Str.Trim() != "") 088 { 089 string SqlStr ="exec|insert+|select+|delete|update|count|chr|mid|master+ |truncate|char|declare|drop+|drop +table|creat+|create|*|iframe|script|"; 090 SqlStr +="exec+|insert|delete+|update+|count(|count+|chr+|+mid (|+mid+|+master+|truncate+ |char+|+char(|declare +|drop+table|creat+table"; 091 string[] anySqlStr = SqlStr.Split('|'); 092 foreach (string ss in anySqlStr) 093 { 094 if (Str.ToLower().IndexOf(ss) >= 0) 095 { 096 ReturnValue = false; 097 break; 098 } 099 } 100 } 101 } 102 catch 103 { 104 ReturnValue = false; 105 } 106 return ReturnValue; 107 } 108 /// <summary> 109 /// 检测是否符合email格式 110 /// </summary> 111 /// <param name="strEmail"> 要判断的email字符串</param> 112 ///<returns 判断结果</returns> 113 public static bool IsValidEmail(string strEmail) 114 { 115 return Regex.IsMatch(strEmail, @"^([w-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([w-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$"); 116 } 117 /// <summary> 118 /// 检测是否是正确的Url 119 /// </summary> 120 /// <param name="strUrl"> 要验证的Url</param> 121 /// <returns>判断结果</returns> 122 public static bool IsURL(string strUrl) 123 { 124 return Regex.IsMatch(strUrl, @"^(http|https)://([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9-]+.)*[a-zA-Z0-9-]+.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{1,10}))(:[0-9]+)*(/($|[a-zA-Z0-9.,?'+&%$#=~_-]+))*$"); 125 } 126 /// <summary> 127 /// 检测是否有Sql危险字符 128 /// </summary> 129 /// <param name="str"> 要判断字符串</param> 130 ///<returns> 判断结果</returns> 131 public static bool IsSafeSqlString(string str) 132 { 133 return !Regex.IsMatch(str, @"[-|;|,|/|(|)|[|]|}|{|%|@|*|!|']"); 134 } 135 /// <summary> 136 /// 改正sql语句中的转义字符 137 /// </summary> 138 public static string mashSQL(string str) 139 { 140 string str2; 141 if (str == null) 142 { 143 str2 = ""; 144 } 145 else 146 { 147 str = str.Replace("'", "'"); 148 str2 = str; 149 } 150 return str2; 151 } 152 /// <summary> 153 /// 获得当前页面客户端的IP 154 /// </summary> 155 /// <returns>当前页面客户端的IP</returns> 156 public static string GetIP() 157 { 158 string result = String.Empty; 159 result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; 160 if (null == result || result == String.Empty) 161 { 162 result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; 163 } 164 if (null == result || result == String.Empty) 165 { 166 result = HttpContext.Current.Request.UserHostAddress; 167 } 168 if (null == result || result == String.Empty || !IsIP(result)) 169 { 170 return "0.0.0.0"; 171 } 172 return result; 173 } 174 /// <summary> 175 /// 是否为ip 176 /// </summary> 177 /// <param name="ip"></param> 178 /// <returns></returns> 179 public static bool IsIP(string ip) 180 { 181 return Regex.IsMatch(ip, @"^((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?)$"); 182 } 183 /// <summary> 184 /// 将全角数字转换为数字 185 /// </summary> 186 /// <param name="SBCCase"></param> 187 /// <returns></returns> 188 public static string SBCCaseToNumberic(string SBCCase) 189 { 190 char[] c = SBCCase.ToCharArray(); 191 for (int i = 0; i < c.Length; i++) 192 { 193 byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1); 194 if (b.Length == 2) 195 { 196 if (b[1] == 255) 197 { 198 b[0] = (byte)(b[0] + 32); 199 b[1] = 0; 200 c[i] = System.Text.Encoding.Unicode.GetChars(b)[0]; 201 } 202 } 203 } 204 return new string(c); 205 } 206 /// <summary> 207 /// 判断某值是否在枚举内(位枚举) 208 /// </summary> 209 ///<param name="checkingValue"> 被检测的枚举值</param> 210 ///<param name="expectedValue"> 期望的枚举值</param> 211 /// <returns>是否包含</returns> 212 public static bool CheckFlagsEnumEquals(Enum checkingValue, Enum expectedValue) 213 { 214 int intCheckingValue = Convert.ToInt32(checkingValue); 215 int intExpectedValue = Convert.ToInt32(expectedValue); 216 return (intCheckingValue & intExpectedValue) == intExpectedValue; 217 } 218 } 219} |
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