C#字符串工具类截取过滤格式判断等

1、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.RegularExpression

2、s;006using System.Web;007namespace CLB.Utility.CharTools008009 public static class StringHelper010 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&quo

3、t;> 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.Encod

4、ing.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口 origStri );

5、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 / <summa

6、ry>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 sta

7、tic 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 readyLen

8、gth = 0;058 int byteLength;059 for (int i = 0; i < origStr.Length; i+)060 061 byteLength = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(new char口 origStri );062 readyLength += byteLength;063 if (readyLength = endIndex)064 065 origStr = origStr.Substring(0, i + 1);066 brea

9、k;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 / &

10、lt;returns></returns>082 public static bool ProcessSqlStr(string Str)083 084 bool ReturnValue = true;085 try086 087 if (Str.Trim() !="")088 089 string SqlStr ="exec|insert+|select+|delete|update|count|chr|mid|master+ |truncate|char|declare|drop+|drop +table|creat+

11、|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口 anySqlStr = SqlStr.Split('|');092 foreach (string ss in anySqlStr)093 094 if (Str.ToLower().IndexOf

12、(ss) >= 0)095 096 ReturnValue = false;097 break;098 099 100 101 102 catch103 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&

13、amp;gt;112 /<returns 判断结果 </returns>113 public static bool IsValidEmail(string strEmail)114 115returnRegex.IsM10-92|1-910-91|1-9).(250-5|20-40-9|0-110-92|1-910- 91|1-90).(250-5|20-40-9|0-110-92|1-910-91|1-90).(250-5|20-40-9 “0-110-92|1-910-91|0-9)|localhost|(a-zA-Z0-9-+.)*a-zA-Z

14、0-9-+.(com|edu|go v|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|a-zA-Z1,10)(: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&g

15、t;130 /<returns>判断结果 </returns>131 public static bool IsSafeSqlString(string str)132 133 return !Regex.IsMatch(str, "-|;|,|/|(|)|%|*|!口)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 14

16、0 string str2;141 if (str = null)142 143 str2 =""144 145 else146 147 str = str.Replace(皿,皿);148 str2 = str;149 150 return str2;151 152 / <summary>153 /获得当前页面客户端的IP154 / </summary>155 / <returns>当前页面客户端的IP</returns>156 public static st

17、ring GetIP()157 158 string result = String.Empty;159resultHttpContext.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 = S

18、tring.Empty)165 166 result = HttpContext.Current.Request.UserHostAddress;167 168 if (null = result | result = String.Empty | !IsIP(result)169 170 return ""171 172 return result;173 174 / <summary>175 /是否为ip176 /  </summary>177 / <param nam

19、e="ip"></param>178 / <returns&gummary>186 / <param name="SBCCase"></param>187 / <returns></returns>188 public static string SBCCaseToNumberic(string SBCCase)189 190 char口 c = SBCCase.ToCharArray();191 for (int i = 0; i < c.Length; i+)192 193 byte口 b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);194 if (b.Length = 2)195 196 if (b1 = 255)197 198 b0 = (byte)(b0 + 32);199 b1 = 0;200 ci = System.Text.Encoding.Unicode.GetChars