StringHelper字符串处理帮助类库大全<二>

StringHelper字符串处理类

删除HTML标记

截断字符串
生成唯一ID 由数字组成
压缩与解压字符串
解压字符串
转全角的函数(SBC case)
转半角的函数(DBC case)
Html 编码
对字符串进行HTML解码,解析为可为页面识别的代码
用户名过滤（字符串过滤）
SQL注入过滤
将指定的str串执行sql关键字过滤并返回
将指定的串列表执行sql关键字过滤并以[,]号分隔返回
获取CheckBoxList控件中选中的项
获取CheckBoxList控件中选中的项的Text，字符串由,分隔
根据提供的Id字符串，将列表中的项选中
利用 MD5 加密算法加密字符串
将指定串加密为不包含中杠的MD5值
将字符串翻译成字节数组
SHA1 加密
DES加密字符串
DES解密字符串
AES 加密 解密
base64 字符串编码
base 64 字符串解码
转换为中文星期
执行CMD 命令
替换指定符串中的首个指定字符为新的字符
ReplaceHtml HTML标记替换

生成随机字符串，格式：1q2w3e4r

将操作符代码转换为SQL的操作符号

StringHelper帮助类库源码

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.IO.Compression;
using System.Web.UI.WebControls;
using System.Security.Cryptography;
using System.Diagnostics;
using System.Web;
using System.Collections;
  
namespace JsonsTeam.Common
{
    public class StringHelper
    {
        #region 删除HTML标记
        /// <summary>
        /// 删除HTML标记
        /// </summary>
        /// <param name="htmlString">带有样式的字符串</param>
        /// <returns></returns>
        public static string RemoveHtmlFormat(string htmlString)
        {
            return Regex.Replace(htmlString, "<[^>] >", "");
        }
        #endregion
  
        #region 截断字符串
        /// <summary>
        /// 截断字符串
        /// </summary>
        /// <param name="str">要截断的字符串</param>
        /// <param name="length">长度</param>
        /// <returns></returns>
        public static string CutString(string str, int length)
        {
            int i = 0, j = 0;
            foreach (char chr in str)
            {
                i  = 2;
                if (i > length)
                {
                    str = str.Substring(0, j - 1)   "...";
                    break;
                }
                j  ;
            }
            return str;
        }
        #endregion
  
        #region 生成唯一ID 由数字组成
  
        /// <summary>
        /// 生成唯一ID
        /// </summary>
        /// <returns></returns>
        public static string CreateIDCode()
        {
            DateTime Time1 = DateTime.Now.ToUniversalTime();
            DateTime Time2 = Convert.ToDateTime("1970-01-01");
            TimeSpan span = Time1 - Time2;   //span就是两个日期之间的差额   
            string t = span.TotalMilliseconds.ToString("0");
  
            return t;
        }
        #endregion
  
        #region 压缩与解压字符串
  
        #region 压缩字符串
        /// <summary>
        /// 压缩字符串
        /// </summary>
        /// <param name="unCompressedString">要压缩的字符串</param>
        /// <returns></returns>
        public static string ZipString(string unCompressedString)
        {
  
            byte[] bytData = System.Text.Encoding.UTF8.GetBytes(unCompressedString);
            MemoryStream ms = new MemoryStream();
            Stream s = new GZipStream(ms, CompressionMode.Compress);
            s.Write(bytData, 0, bytData.Length);
            s.Close();
            byte[] compressedData = (byte[])ms.ToArray();
            return System.Convert.ToBase64String(compressedData, 0, compressedData.Length);
        }
  
        #endregion
  
        #region 解压字符串
        /// <summary>
        ///  解压字符串
        /// </summary>
        /// <param name="unCompressedString">要解压的字符串</param>
        /// <returns></returns>
        public static string UnzipString(string unCompressedString)
        {
            System.Text.StringBuilder uncompressedString = new System.Text.StringBuilder();
            byte[] writeData = new byte[4096];
  
            byte[] bytData = System.Convert.FromBase64String(unCompressedString);
            int totalLength = 0;
            int size = 0;
  
            Stream s = new GZipStream(new MemoryStream(bytData), CompressionMode.Decompress);
            while (true)
            {
                size = s.Read(writeData, 0, writeData.Length);
                if (size > 0)
                {
                    totalLength  = size;
                    uncompressedString.Append(System.Text.Encoding.UTF8.GetString(writeData, 0, size));
                }
                else
                {
                    break;
                }
            }
            s.Close();
            return uncompressedString.ToString();
        }
  
        #endregion
  
        #endregion
  
        #region 转全角的函数(SBC case)
        /// 
        /// 转全角的函数(SBC case)
        /// 
        /// 任意字符串
        /// 全角字符串
        ///
        ///全角空格为12288，半角空格为32///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        ///        
        public string ToSBC(string input)
        {
            //半角转全角：
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i  )
            {
                if (c == 32)
                {
                    c = (char)12288;
                    continue;
                }
                if (c < 127)
                    c = (char)(c   65248);
            }
            return new string(c);
        }
  
        #endregion
  
        #region 转半角的函数(DBC case)
        /// 
        /// 转半角的函数(DBC case)
        /// 
        /// 任意字符串
        /// 半角字符串
        ///
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        ///
        public string ToDBC(string input)
        {
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i  )
            {
                if (c == 12288)
                {
                    c = (char)32;
                    continue;
                }
                if (c > 65280 && c < 65375)
                    c = (char)(c - 65248);
            }
            return new string(c);
        }
        #endregion
  
        #region Html 编码
  
        /// <summary>
        /// 对文本框中的字符进行HTML编码
        /// </summary>
        /// <param name="str">源字符串</param>
        /// <returns></returns>
        public static string HtmlEncode(string str)
        {
            str = str.Replace("&", "&");
            str = str.Replace("'", "''");
            str = str.Replace("\"", """);
            str = str.Replace(" ", " ");
            str = str.Replace("<", "<");
            str = str.Replace(">", ">");
            str = str.Replace("\n", "<br>");
            return str;
        }
  
        /// <summary>
        /// 对字符串进行HTML解码,解析为可为页面识别的代码
        /// </summary>
        /// <param name="str">要解码的字符串</param>
        /// <returns></returns>
        public static string HtmlDecode(string str)
        {
            str = str.Replace("<br>", "\n");
            str = str.Replace(">", ">");
            str = str.Replace("<", "<");
            str = str.Replace(" ", " ");
            str = str.Replace(""", "\"");
            return str;
        }
  
        #endregion
  
        #region  用户名过滤
        /// <summary>
        /// 
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public static bool Filter(string userName)
        {
            if (IsExist(userName,"!")) return false;
            if (IsExist(userName, "！")) return false;
            if (IsExist(userName, "#")) return false;
            if (IsExist(userName, "&")) return false;
            if (IsExist(userName, "$")) return false;
            if (IsExist(userName, "*")) return false;
            if (IsExist(userName, ".")) return false;
            if (IsExist(userName, ",")) return false;
            if (IsExist(userName, ";")) return false;
            if (IsExist(userName, "'")) return false;
            if (IsExist(userName, "<")) return false;
            if (IsExist(userName, ">")) return false;
            return true;
        }
  
        public static bool IsExist(string userName, string filterStr)
        {
            if (userName.IndexOf(filterStr) > -1)
                return true;
            return false;
        }
        #endregion
  
        #region SQL注入过滤
        /// <summary>
        ///SQL注入过滤
        /// </summary>
        /// <param name="InText">要进行过滤的字符串</param>
        /// <returns>如果参数存在不安全字符,则返回true</returns>
        public static bool SqlFilter2(string InText)
        {
            string word = "exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join";
            if (InText == null)
                return false;
            foreach (string i in word.Split('|'))
            {
                if ((InText.ToLower().IndexOf(i   " ") > -1) || (InText.ToLower().IndexOf(" "   i) > -1))
                {
                    return true;
                }
            }
            return false;
        }
  
        /// <summary>
        /// 将指定的str串执行sql关键字过滤并返回
        /// </summary>
        /// <param name="str">要过滤的字符串</param>
        /// <returns></returns>
        public static string SqlFilter(string str)
        {
            return str.Replace("'", "").Replace("'", "").Replace("--", "").Replace("&","").Replace("/*","").Replace(";","").Replace("%","");
        }
  
        /// <summary>
        /// 将指定的串列表执行sql关键字过滤并以[,]号分隔返回
        /// </summary>
        /// <param name="strs"></param>
        /// <returns></returns>
        public static string SqlFilters(params string[] strs)
        {
            StringBuilder sb = new StringBuilder();
            foreach (string str in strs)
            {
                sb.Append(SqlFilter(str)   ",");
            }
            if (sb.Length > 0)
                return sb.ToString().TrimEnd(',');
            return "";
        }
  
        public static bool ProcessSqlStr(string Str)
        {
            bool ReturnValue = false;
            try
            {
                if (Str != "")
                {
                    string SqlStr = "'|insert|select*|and'|or'|insertinto|deletefrom|altertable|update|createtable|createview|dropview|createindex|dropindex|createprocedure|dropprocedure|createtrigger|droptrigger|createschema|dropschema|createdomain|alterdomain|dropdomain|);|select@|declare@|print@|char(|select";
                    string[] anySqlStr = SqlStr.Split('|');
                    foreach (string ss in anySqlStr)
                    {
                        if (Str.IndexOf(ss) >= 0)
                        {
                            ReturnValue = true;
                        }
                    }
                }
            }
            catch
            {
                ReturnValue = true;
            }
  
            return ReturnValue;
        }
  
         
        #endregion
  
        #region 获取CheckBoxList控件中选中的项
        /// <summary>
        /// 获取CheckBoxList控件中选中的项的value，字符串由,分隔
        /// </summary>
        /// <param name="chk">CheckBoxList 控件ID</param>
        /// <returns></returns>
        public static string GetCheckedItemValue(CheckBoxList chk)
        {
            string s = "";
            foreach (ListItem li in chk.Items)
            {
                if (li.Selected)
                    s  = li.Value   ",";
            }
            return s.TrimEnd(',');
        }
        /// <summary>
        /// 获取CheckBoxList控件中选中的项的Text，字符串由,分隔
        /// </summary>
        /// <param name="chk">CheckBoxList 控件ID</param>
        /// <returns></returns>
        public static string GetCheckedItemText(CheckBoxList chk)
        {
            string s = "";
            foreach (ListItem li in chk.Items)
            {
                if (li.Selected)
                    s  = li.Text   ",";
            }
            return s.TrimEnd(',');
        }
        #endregion
  
        #region 根据提供的Id字符串，将列表中的项选中
        /// <summary>
        /// 根据提供的Id字符串，将列表中的项选中
        /// </summary>
        /// <param name="itemid">Id字符串，由,分隔</param>
        /// <param name="checkboxlist">CheckBoxList控件</param>
        public static void CheckItem(string itemid, CheckBoxList checkboxlist)
        {
            foreach (ListItem li in checkboxlist.Items)
            {
                if (itemid.IndexOf(li.Value) != -1)
                    li.Selected = true;
            }
        }
  
        #endregion
  
        #region 加密字符串 MD5
        #region 利用 MD5 加密算法加密字符串
        /// <summary>
        /// 利用 MD5 加密算法加密字符串
        /// </summary>
        /// <param name="src">字符串源串</param>
        /// <returns>返加MD5 加密后的字符串</returns>
        public static string ComputeMD5(string src)
        {
            //将密码字符串转化成字节数组
            byte[] byteArray = GetByteArray(src);
  
            //计算 MD5 密码
            byteArray = (new MD5CryptoServiceProvider().ComputeHash(byteArray));
  
            //将字节码转化成字符串并返回
            return BitConverter.ToString(byteArray);
        }
  
        /// <summary>
        /// 将指定串加密为不包含中杠的MD5值
        /// </summary>
        /// <param name="str">要加密的字符串</param>
        /// <param name="isupper">返回值的大小写(true大写,false小写)</param>
        /// <returns></returns>
        public static string ComputeMD5(string str, bool isupper)
        {
            string md5str = ComputeMD5(str);
            if (isupper)
                return md5str.ToUpper();
            return md5str.ToLower();
        }
        #endregion
  
        #region 将字符串翻译成字节数组
        /// <summary>
        /// 将字符串翻译成字节数组
        /// </summary>
        /// <param name="src">字符串源串</param>
        /// <returns>字节数组</returns>
        private static byte[] GetByteArray(string src)
        {
            byte[] byteArray = new byte[src.Length];
  
            for (int i = 0; i < src.Length; i  )
            {
                byteArray = Convert.ToByte(src);
            }
  
            return byteArray;
        }
        #endregion
  
        #region MD5string
  
        public static string MD5string(string str)
        {
            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
        }
  
        public static string MD5string(string str,bool isupper)
        {
            string md5string = MD5string(str);
            if (isupper)
                return md5string.ToUpper();
            else
                return md5string.ToLower();
        }
  
        #endregion
        #endregion
  
        #region SHA1 加密
        public string SHA1(string Source_String)
        {
            byte[] StrRes = Encoding.Default.GetBytes(Source_String);
            HashAlgorithm iSHA = new SHA1CryptoServiceProvider();
            StrRes = iSHA.ComputeHash(StrRes);
            StringBuilder EnText = new StringBuilder();
            foreach (byte iByte in StrRes)
            {
                EnText.AppendFormat("{0:x2}", iByte);
            }
            return EnText.ToString();
        }
        #endregion
  
        #region DES加密字符串
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public static string EncryptDES(string encryptString,string key)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                byte[] rgbIV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }
        #endregion
  
        #region DES解密字符串
        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="key">解密密钥，要求8位</param>
        /// <returns></returns>
        public static string DecryptDES(string decryptString,string key)
        {
            try
            {
                //默认密钥向量
                byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] rgbKey = Encoding.UTF8.GetBytes(key);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }
  
        #endregion
  
        #region AES 加密 解密
         
         
  
        /// <summary>
        /// AES加密
        /// </summary>
        /// <param name="str">要加密字符串</param>
        /// <returns>返回加密后字符串</returns>
        public static String EncryptAES(String str,string aeskey)
        {
            Byte[] keyArray = System.Text.UTF8Encoding.UTF8.GetBytes(aeskey);
            Byte[] toEncryptArray = System.Text.UTF8Encoding.UTF8.GetBytes(str);
  
            System.Security.Cryptography.RijndaelManaged rDel = new System.Security.Cryptography.RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = System.Security.Cryptography.CipherMode.ECB;
            rDel.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
  
            System.Security.Cryptography.ICryptoTransform cTransform = rDel.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
  
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
  
  
  
        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="str">要解密字符串</param>
        /// <returns>返回解密后字符串</returns>
        public static String DecryptAES(String str, string aeskey)
        {
            Byte[] keyArray = System.Text.UTF8Encoding.UTF8.GetBytes(aeskey);
            Byte[] toEncryptArray = Convert.FromBase64String(str);
  
            System.Security.Cryptography.RijndaelManaged rDel = new System.Security.Cryptography.RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = System.Security.Cryptography.CipherMode.ECB;
            rDel.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
  
            System.Security.Cryptography.ICryptoTransform cTransform = rDel.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
  
            return System.Text.UTF8Encoding.UTF8.GetString(resultArray);
        }
  
 #endregion
  
        #region  base64 字符串编码
        /// <summary>
        /// base64 字符串编码
        /// </summary>
        /// <param name="str">要编码的字符串</param>
        /// <returns></returns>
        public static string ToBase64(string str)
        {
            byte[] data = System.Text.ASCIIEncoding.ASCII.GetBytes(str);
            return Convert.ToBase64String(data); 
        }
  
        /// <summary>
        /// base 64 字符串解码
        /// </summary>
        /// <param name="base64str">要解码的字符串</param>
        /// <returns></returns>
        public static string UnBase64(string base64str)
        {
            byte[] data = Convert.FromBase64String(base64str);
            return System.Text.ASCIIEncoding.ASCII.GetString(data); 
        }
  
  
        #endregion
  
        #region 转换为中文星期
        /// <summary>
        /// 转换为中文星期
        /// </summary>
        /// <param name="dayfweek">英文星期</param>
        /// <returns></returns>
        public static string ConvertWeekDayToCn(DayOfWeek dayfweek)
        {
            switch (dayfweek)
            {
                case DayOfWeek.Sunday:
                    return "星期日";
                case DayOfWeek.Monday:
                    return "星期一";
                case DayOfWeek.Tuesday:
                    return "星期二";
                case DayOfWeek.Wednesday:
                    return "星期三";
                case DayOfWeek.Thursday:
                    return "星期四";
                case DayOfWeek.Friday:
                    return "星期五";
                case DayOfWeek.Saturday:
                    return "星期六";
                default:
                    return "";
            }
        }
  
        #endregion
  
        #region 执行CMD 命令
        /// <summary>
        /// 执行CMD 命令
        /// </summary>
        /// <param name="strCommand">命令串</param>
        /// <returns></returns>
        public static string RunCommand(string strCommand)
        {
            Process process = new Process();
            process.StartInfo.FileName = "CMD.exe";
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardInput = true;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.RedirectStandardError = true;
            process.StartInfo.CreateNoWindow = true;
            process.Start();
            process.StandardInput.WriteLine(strCommand);
            process.StandardInput.WriteLine("exit");
            string str = process.StandardOutput.ReadToEnd();
            process.Close();
            return str;
        }
        #endregion
  
         
        public static string Escape(string s)
        {
            StringBuilder builder = new StringBuilder();
            byte[] bytes = Encoding.Unicode.GetBytes(s);
            for (int i = 0; i < bytes.Length; i  = 2)
            {
                builder.Append("%u");
                builder.Append(bytes[i   1].ToString("X2"));
                builder.Append(bytes.ToString("X2"));
            }
            return builder.ToString();
        }
  
        public static string ReplaceHtml(string str)
        {
            if (str == null || str.Length==0)
                return "";
            str = str.Replace("<", "<");
            str = str.Replace(">", ">");
            str = str.Replace("\n", "");
            str = str.Replace("\r", "");
            return str; 
        }
  
        public static string ReplaceEnter(string str)
        {
            if (str == null || str.Length == 0)
                return "";
              
            str = str.Replace("\n", "");
            str = str.Replace("\r", "");
            return str;
        }
  
        /// <summary>
        /// 替换指定符串中的首个指定字符为新的字符
        /// </summary>
        /// <param name="sourcestr">要修改的字符串</param>
        /// <param name="oldstr">被替换的字符串</param>
        /// <param name="newstr">替换字符串 </param>
        /// <returns></returns>
        public static string ReplaceFirst(string sourcestr,string oldstr, string newstr)
        {
            Regex reg = new Regex(oldstr);
            if (reg.IsMatch(sourcestr))
            {
                sourcestr = reg.Replace(sourcestr, newstr, 1);
            }
            return sourcestr;
        }
  
        #region 生成随机字符串，格式：1q2w3e4r
        /// <summary>
        /// 生成随机字符串，格式：1q2w3e4r
        /// </summary>
        /// <returns></returns>
        public static string BuildPassword()
        {
            Random random = new Random();
            List<int> ints = new List<int>();
            for (int i = 0; i < 4; i  )
            {
                ints.Add(random.Next(9));
            }
  
            List<string> strs = new List<string>();
  
            //string CodeSerial = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
            string CodeSerial = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z";
  
            string[] arr = CodeSerial.Split(',');
  
            int randValue = -1;
            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
  
            for (int i = 0; i < 4; i  )
            {
                randValue = rand.Next(0, arr.Length - 1);
  
                strs.Add(arr[randValue]);
            }
  
            string passwd = "";
  
            for (int k = 0; k < 4; k  )
            {
                passwd  = ints[k].ToString()   strs[k];
            }
  
            return passwd;
        }
        #endregion
       /// <summary>
        /// 将操作符代码转换为SQL的操作符号
        /// </summary>
        /// <param name="op"></param>
        /// <returns></returns>
        private static string GetOperatorQueryText(string op)
        {
            switch (op.ToLower())
            {
                case "eq": return " = ";
                case "gt": return " > ";
                case "ge": return " >= ";
                case "nu": return " IS NULL ";
                case "nn": return " IS NOT NULL ";
                case "lt": return " < ";
                case "le": return " <= ";
                case "cn": return " like ";
                case "bw": return " like ";
                case "ew": return " like ";
                case "ne": return " <> ";
                case "in": return " IN ";
                case "ni": return " NOT IN ";
                default: return " = ";
            }
        }
  
        public static object GetRequestObject(string key)
        {
            return HttpContext.Current.Request[key];
        }
    }
}

原文链接：StringHelper字符串处理帮助类库大全<二>