StringHelper字符串处理帮助类库大全<一>

StringHelper字符串处理帮助类库大全

SHA1 加密

SHA1加密签名比对

MD5加密

获取时间戳

时间戳转为C#格式时间

计算出请求有效时间 (秒)单位

检测密码是否符合要求

格式化距今时间

生成手机短信验证码

检查字符串中是否包含非法字符

截取长度并转换为HTML

删除所有的html标记 

取得所有链接URL

获取所有连接文本

StringHelper帮助类库源码

/// <summary>
/// 开发团队：yunjsonTeam
/// 官方主页:http://www.yunjson.com
/// </summary>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Security.Cryptography;
using System.Web;

namespace yunjsonUtil.Helper
{
    public class StringHelper
    {
        /// <summary>
        ///  SHA1 加密
        /// </summary>
        /// <param name="Source_String">加密串</param>
        /// <returns></returns>
        public static 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();
        }

        /// <summary>
        /// SHA1加密签名比对
        /// </summary>
        /// <param name="signature">加密签名</param>
        /// <param name="token">由AppId和AppSecret得到的凭据</param>
        /// <returns></returns>
        public static bool CheckSignature(string signature, string token)
        {
            string strResult = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(token, "SHA1");
            return signature.Equals(strResult, StringComparison.InvariantCultureIgnoreCase);
        }

        /// <summary>
        ///  MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string MD5string(string str)
        {
            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
        }
        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="str"></param>
        /// <param name="isupper"></param>
        /// <returns></returns>
        public static string MD5string(string str, bool isupper)
        {
            string md5string = MD5string(str);
            if (isupper)
                return md5string.ToUpper();
            else
                return md5string.ToLower();
        }


        /// <summary>
        /// 获取时间戳
        /// </summary>
        /// <returns></returns>
        public static string GetTimeStamp()
        {
            TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            return Convert.ToInt64(ts.TotalSeconds).ToString();
        }
        /// <summary>
        /// 时间戳转为C#格式时间
        /// </summary>
        /// <param name="timeStamp">Unix时间戳格式</param>
        /// <returns>C#格式时间</returns>
        public static DateTime GetStampDateTime(long timeStamp)
        {
            DateTime time = new DateTime();
            try
            {
                DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
                long lTime = long.Parse(timeStamp + "0000000");
                TimeSpan toNow = new TimeSpan(lTime);
                time = dtStart.Add(toNow);
            }
            catch
            {
                time = DateTime.Now.AddDays(-30);
            }
            return time;
        }
        ///<summary>
        /// 计算出请求有效时间 (秒)单位
        /// </summary>
        /// <param name="dateBegin">开始时间</param>
        /// <param name="dateEnd">结束时间</param>
        /// <returns>返回(秒)单位，比如: 0.00239秒</returns>
        public static double GetcDateDiff(DateTime dateBegin, DateTime dateEnd)
        {
            double getdiff = 0;
            try
            {
                TimeSpan ts1 = new TimeSpan(dateBegin.Ticks);
                TimeSpan ts2 = new TimeSpan(dateEnd.Ticks);
                TimeSpan ts3 = ts1.Subtract(ts2).Duration();
                getdiff = ts3.TotalSeconds;
            }
            catch
            {
                getdiff = 4004;
            }
            return getdiff;
        }

        /// <summary>
        /// 检测密码是否符合要求（不能为纯数字或纯字母，长度不小于6）
        /// </summary>
        /// <param name="password"></param>
        /// <returns></returns>
        public static bool PasswordStrengthIsHigh(string password)
        {
            if (password.Length < 6)
            {
                return false;
            }
            Regex reg = new Regex(@"^(([a-zA-Z]*)|(\d*))$");
            return !reg.IsMatch(password);
        }

        /// <summary>
        /// 格式化距今时间
        /// </summary>
        /// <param name="dt">时间</param>
        /// <returns>string</returns>
        public static string GetElapsedTime(DateTime dt)
        {
            TimeSpan sp = DateTime.Now - dt;
            if (sp.TotalHours <= 1)
            {
                if (sp.TotalMinutes <= 1)
                {
                    return "1分钟内";
                }
                else
                {
                    return (int)Math.Ceiling(sp.TotalMinutes) + "分钟内";
                }
            }
            else if (sp.TotalDays <= 2)
            {
                return (int)Math.Ceiling(sp.TotalHours) + "小时内";
            }
            else if (sp.TotalDays < 3)
            {
                return "三天内";
            }
            else if (sp.TotalDays < 4)
            {
                return "四天内";
            }
            else if (sp.TotalDays < 5)
            {
                return "五天内";
            }
            else if (sp.TotalDays < 6)
            {
                return "六天内";
            }
            else if (sp.TotalDays < 7)
            {
                return "一周内";
            }
            if (dt.Year == DateTime.Now.Year)
            {
                return dt.ToString("MM-dd");
            }
            else
            {
                return dt.ToString("yyyy-MM-dd");
            }
        }

        /// <summary>
        /// 生成手机短信验证码
        /// </summary>
        /// <returns></returns>
        public static string GetRandomNumberString()
        {
            Random theRandomNumber = new Random();
            return theRandomNumber.Next(100000, 999999).ToString();
        }

        #region 常规字符串操作
        // 检查字符串是否为空
        public static bool IsEmpty(string str)
        {
            if (str == null || str == "")
                return true;
            else
                return false;
        }
        //检查字符串中是否包含非法字符
        public static bool CheckValidity(string s)
        {
            string str = s;
            if (str.IndexOf("'") > 0 || str.IndexOf("&") > 0 || str.IndexOf("%") > 0 || str.IndexOf("+") > 0 || str.IndexOf("\"") > 0 || str.IndexOf("=") > 0 || str.IndexOf("!") > 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 把价格精确至小数点两位
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string TransformPrice(double dPrice)
        {
            double d = dPrice;
            NumberFormatInfo myNfi = new NumberFormatInfo();
            myNfi.NumberNegativePattern = 2;
            string s = d.ToString("N", myNfi);
            return s;
        }

        public static string TransToStr(float f, int iNum)
        {
            float fl = f;
            NumberFormatInfo myNfi = new NumberFormatInfo();
            myNfi.NumberNegativePattern = iNum;
            string s = f.ToString("N", myNfi);
            return s;
        }

        /// <summary> 
        /// 检测含有中文字符串的实际长度 
        /// </summary> 
        /// <param name="str">字符串</param> 
        public static int GetLength(string str)
        {
            System.Text.ASCIIEncoding n = new System.Text.ASCIIEncoding();
            byte[] b = n.GetBytes(str);
            int l = 0; // l 为字符串之实际长度 
            for (int i = 0; i <= b.Length - 1; i++)
            {
                if (b[i] == 63) //判断是否为汉字或全脚符号 
                {
                    l++;
                }
                l++;
            }
            return l;

        }

        //截取长度,num是英文字母的总数，一个中文算两个英文
        public static string GetLetter(string str, int iNum, bool bAddDot)
        {
            if (str == null || iNum <= 0) return "";

            if (str.Length < iNum && str.Length * 2 < iNum)
            {
                return str;
            }

            string sContent = str;
            int iTmp = iNum;

            char[] arrC;
            if (sContent.Length >= iTmp) //防止因为中文的原因使ToCharArray溢出
            {
                arrC = str.ToCharArray(0, iTmp);
            }
            else
            {
                arrC = str.ToCharArray(0, sContent.Length);
            }

            int i = 0;
            int iLength = 0;
            foreach (char ch in arrC)
            {
                iLength++;

                int k = (int)ch;
                if (k > 127 || k < 0)
                {
                    i += 2;
                }
                else
                {
                    i++;
                }

                if (i > iTmp)
                {
                    iLength--;
                    break;
                }
                else if (i == iTmp)
                {
                    break;
                }
            }

            if (iLength < str.Length && bAddDot)
                sContent = sContent.Substring(0, iLength - 3) + "...";
            else
                sContent = sContent.Substring(0, iLength);

            return sContent;
        }

        public static string GetDateString(DateTime dt)
        {
            return dt.Year.ToString() + dt.Month.ToString().PadLeft(2, '0') + dt.Day.ToString().PadLeft(2, '0');
        }

        //根据指定字符，截取相应字符串
        public static string GetStrByLast(string sOrg, string sLast)
        {
            int iLast = sOrg.LastIndexOf(sLast);
            if (iLast > 0)
                return sOrg.Substring(iLast + 1);
            else
                return sOrg;
        }
        public static string GetPreStrByLast(string sOrg, string sLast)
        {
            int iLast = sOrg.LastIndexOf(sLast);
            if (iLast > 0)
                return sOrg.Substring(0, iLast);
            else
                return sOrg;
        }
        public static string RemoveEndWith(string sOrg, string sEnd)
        {
            if (sOrg.EndsWith(sEnd))
                sOrg = sOrg.Remove(sOrg.IndexOf(sEnd), sEnd.Length);
            return sOrg;
        }

        #endregion  常规字符串操作

        #region HTML相关操作
        public static string ClearTag(string sHtml)
        {
            if (sHtml == "")
                return "";
            string sTemp = sHtml;
            Regex re = new Regex(@"(<[^>\s]*\b(\w)+\b[^>]*>)|(<>)|( )|(>)|(<)|(&)|\r|\n|\t", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            return re.Replace(sHtml, "");
        }
        public static string ClearTag(string sHtml, string sRegex)
        {
            string sTemp = sHtml;
            Regex re = new Regex(sRegex, RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            return re.Replace(sHtml, "");
        }
        public static string ConvertToJS(string sHtml)
        {
            StringBuilder sText = new StringBuilder();
            Regex re;
            re = new Regex(@"\r\n", RegexOptions.IgnoreCase);
            string[] strArray = re.Split(sHtml);
            foreach (string strLine in strArray)
            {
                sText.Append("document.writeln(\"" + strLine.Replace("\"", "\\\"") + "\");\r\n");
            }
            return sText.ToString();
        }
        public static string ReplaceNbsp(string str)
        {
            string sContent = str;
            if (sContent.Length > 0)
            {
                sContent = sContent.Replace(" ", "");
                sContent = sContent.Replace(" ", "");
                sContent = "    " + sContent;
            }
            return sContent;
        }
        public static string StringToHtml(string str)
        {
            string sContent = str;
            if (sContent.Length > 0)
            {
                char csCr = (char)13;
                sContent = sContent.Replace(csCr.ToString(), "<br>");
                sContent = sContent.Replace(" ", " ");
                sContent = sContent.Replace("　", "  ");
            }
            return sContent;
        }

        //截取长度并转换为HTML
        public static string AcquireAssignString(string str, int num)
        {
            string sContent = str;
            sContent = GetLetter(sContent, num, false);
            sContent = StringToHtml(sContent);
            return sContent;
        }

        //此方法与AcquireAssignString的功能已经一样，为了不报错，故保留此方法
        public static string TranslateToHtmlString(string str, int num)
        {
            string sContent = str;
            sContent = GetLetter(sContent, num, false);
            sContent = StringToHtml(sContent);
            return sContent;
        }

        public static string AddBlankAtForefront(string str)
        {
            string sContent = str;
            return sContent;
        }

        /// <summary>
        /// 删除所有的html标记 
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DelHtmlString(string str)
        {
            string[] Regexs =
                                {
                                    @"<script[^>]*?>.*?</script>",
                                    @"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>",
                                    @"([\r\n])[\s]+",
                                    @"&(quot|#34);",
                                    @"&(amp|#38);",
                                    @"&(lt|#60);",
                                    @"&(gt|#62);",
                                    @"&(nbsp|#160);",
                                    @"&(iexcl|#161);",
                                    @"&(cent|#162);",
                                    @"&(pound|#163);",
                                    @"&(copy|#169);",
                                    @"&#(\d+);",
                                    @"-->",
                                    @"<!--.*\n"
                                };

            string[] Replaces =
                                {
                                    "",
                                    "",
                                    "",
                                    "\"",
                                    "&",
                                    "<",
                                    ">",
                                    " ",
                                    "\xa1", //chr(161),
                                    "\xa2", //chr(162),
                                    "\xa3", //chr(163),
                                    "\xa9", //chr(169),
                                    "",
                                    "\r\n",
                                    ""
                                };

            string s = str;
            for (int i = 0; i < Regexs.Length; i++)
            {
                s = new Regex(Regexs[i], RegexOptions.Multiline | RegexOptions.IgnoreCase).Replace(s, Replaces[i]);
            }
            s.Replace("<", "");
            s.Replace(">", "");
            s.Replace("\r\n", "");
            return s;
        }

        /// <summary>
        /// 删除字符串中的特定标记 
        /// </summary>
        /// <param name="str"></param>
        /// <param name="tag"></param>
        /// <param name="isContent">是否清除内容 </param>
        /// <returns></returns>
        public static string DelTag(string str, string tag, bool isContent)
        {
            if (tag == null || tag == " ")
            {
                return str;
            }

            if (isContent) //要求清除内容 
            {
                return Regex.Replace(str, string.Format("<({0})[^>]*>([\\s\\S]*?)<\\/\\1>", tag), "", RegexOptions.IgnoreCase);
            }

            return Regex.Replace(str, string.Format(@"(<{0}[^>]*(>)?)|(</{0}[^>] *>)|", tag), "", RegexOptions.IgnoreCase);
        }

        /// <summary>
        /// 删除字符串中的一组标记 
        /// </summary>
        /// <param name="str"></param>
        /// <param name="tagA"></param>
        /// <param name="isContent">是否清除内容 </param>
        /// <returns></returns>
        public static string DelTagArray(string str, string tagA, bool isContent)
        {

            string[] tagAa = tagA.Split(',');

            foreach (string sr1 in tagAa) //遍历所有标记，删除 
            {
                str = DelTag(str, sr1, isContent);
            }
            return str;

        }

        #endregion HTML相关操作

        #region 其他字符串操作

        /// <summary>
        /// 格式化为版本号字符串
        /// </summary>
        /// <param name="sVersion"></param>
        /// <returns></returns>
        public static string SetVersionFormat(string sVersion)
        {
            if (sVersion == null || sVersion == "") return "";
            int n = 0, k = 0;

            string stmVersion = "";
            while (n < 4 && k > -1)
            {
                k = sVersion.IndexOf(".", k + 1);
                n++;
            }
            if (k > 0)
            {
                stmVersion = sVersion.Substring(0, k);
            }
            else
            {
                stmVersion = sVersion;
            }

            return stmVersion;
        }

        /// <summary>
        /// 格式化字符串为 SQL 语句字段
        /// </summary>
        /// <param name="fldList"></param>
        /// <returns></returns>
        public static string GetSQLFildList(string fldList)
        {
            if (fldList == null)
                return "*";
            if (fldList.Trim() == "")
                return "*";
            if (fldList.Trim() == "*")
                return "*";
            //先去掉空格，[]符号
            string strTemp = fldList;
            strTemp = strTemp.Replace(" ", "");
            strTemp = strTemp.Replace("[", "").Replace("]", "");
            //为防止使用保留字，给所有字段加上[]
            strTemp = "[" + strTemp + "]";
            strTemp = strTemp.Replace('，', ',');
            strTemp = strTemp.Replace(",", "],[");
            return strTemp;
        }

        public static string GetTimeDelay(DateTime dtStar, DateTime dtEnd)
        {
            long lTicks = (dtEnd.Ticks - dtStar.Ticks) / 10000000;
            string sTemp = (lTicks / 3600).ToString().PadLeft(2, '0') + ":";
            sTemp += ((lTicks % 3600) / 60).ToString().PadLeft(2, '0') + ":";
            sTemp += ((lTicks % 3600) % 60).ToString().PadLeft(2, '0');
            return sTemp;
        }

        /// <summary>
        /// 在前面补0
        /// </summary>
        /// <returns></returns>
        public static string AddZero(int sheep, int length)
        {
            return AddZero(sheep.ToString(), length);
        }

        /// <summary>
        /// 在前面补0
        /// </summary>
        /// <returns></returns>
        public static string AddZero(string sheep, int length)
        {
            StringBuilder goat = new StringBuilder(sheep);
            for (int i = goat.Length; i < length; i++)
            {
                goat.Insert(0, "0");
            }

            return goat.ToString();
        }

        /// <summary>
        /// 简介：获得唯一的字符串
        /// </summary>
        /// <returns></returns>
        public static string GetUniqueString()
        {
            Random rand = new Random();
            return ((int)(rand.NextDouble() * 10000)).ToString() + DateTime.Now.Ticks.ToString();
        }

        //获得干净,无非法字符的字符串
        public static string GetCleanJsString(string str)
        {
            str = str.Replace("\"", "“");
            str = str.Replace("'", "”");
            str = str.Replace("\\", "\\\\");
            Regex re = new Regex(@"\r|\n|\t", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            str = re.Replace(str, " ");

            return str;
        }
        //获得干净,无非法字符的字符串
        public static string GetCleanJsString2(string str)
        {
            str = str.Replace("\"", "\\\"");
            Regex re = new Regex(@"\r|\n|\t", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace);
            str = re.Replace(str, " ");

            return str;
        }
        #endregion 其他字符串操作

        /// <summary>
        /// 取得所有链接URL
        /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        public static string GetAllURL(string html)
        {
            StringBuilder sb = new StringBuilder();
            Match m = Regex.Match(html.ToLower(), "<a href=(.*?)>.*?</a>");

            while (m.Success)
            {
                sb.AppendLine(m.Result("$1"));
                m.NextMatch();
            }

            return sb.ToString();
        }

        /// <summary>
        /// 获取所有连接文本
        /// </summary>
        /// <param name="html"></param>
        /// <returns></returns>
        public static string GetAllLinkText(string html)
        {
            StringBuilder sb = new StringBuilder();
            Match m = Regex.Match(html.ToLower(), "<a href=.*?>(1,100})</a>");

            while (m.Success)
            {
                sb.AppendLine(m.Result("$1"));
                m.NextMatch();
            }

            return sb.ToString();
        }
      
    }
}