C# 常用类库（字符串处理，汉字首字母拼音，注入攻击，缓存操作，Cookies操作，AES加密等）
十年河东，十年河西，莫欺少年穷
学无止境，精益求精
记录下字符串类库，方便今后查阅
主要包含了字符串解决，去除HTML，SQL注入攻击检测，IP地址处理，Cookies操作，根据身份证获取性别、姓名、年龄等等
代码如下：
using System; using System.Collections.Generic; using System.Web; using System.Collections; using System.Text; using System.Text.RegularExpressions; using System.Data; using System.Drawing; using ZXing; using System.Xml; namespace Hplus.Common { public class CommonMethod { public static bool IsPhone(string Phone) { return System.Text.RegularExpressions.Regex.IsMatch(Phone, @"^[1]+[3,5,4,7,8]+\d{9}"); } /// <summary> /// 判断是否是汉字 /// </summary> /// <param name="text"></param> /// <returns></returns> public static bool CheckStringChinese(string text) { bool res = false; foreach (char t in text) { if ((int)t > 127) res = true; } return res; } #region 截取字符长度 static string CutString(string str, int len) /// <summary> /// 截取字符长度 /// </summary> /// <param name="str">被截取的字符串</param> /// <param name="len">所截取的长度</param> /// <returns>子字符串</returns> public static string CutString(string str, int len) { if (str == null || str.Length == 0 || len <= 0) { return string.Empty; } int l = str.Length; #region 计算长度 int clen = 0; while (clen < len && clen < l) { //每遇到一个中文，则将目标长度减一。 if ((int)str[clen] > 128) { len--; } clen++; } #endregion if (clen < l) { return str.Substring(0, clen) + "..."; } else { return str; } } /// <summary> /// //截取字符串中文 字母 /// </summary> /// <param name="content">源字符串</param> /// <param name="length">截取长度！</param> /// <returns></returns> public static string SubTrueString(object content, int length) { string strContent = NoHTML(content.ToString()); bool isConvert = false; int splitLength = 0; int currLength = 0; int code = 0; int chfrom = Convert.ToInt32("4e00", 16); //范围（0x4e00～0x9fff）转换成int（chfrom～chend） int chend = Convert.ToInt32("9fff", 16); for (int i = 0; i < strContent.Length; i++) { code = Char.ConvertToUtf32(strContent, i); if (code >= chfrom && code <= chend) { currLength += 2; //中文 } else { currLength += 1;//非中文 } splitLength = i + 1; if (currLength >= length) { isConvert = true; break; } } if (isConvert) { return strContent.Substring(0, splitLength); } else { return strContent; } } #endregion #region /*产生验证码*/ GetCode(int codeLength) /// <summary> /// 生成一个1到10000000之间的正整数 /// </summary> /// <returns></returns> public static int GetNums() { int a = new Random().Next(1, 100000000); return a; } /// <summary> /// 产生验证码 /// </summary> /// <param name="codeLength">获取的验证码长度</param> /// <returns>验证码</returns> public static string GetCode(int codeLength) { string so = "1,2,3,4,5,6,7,8,9,0,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; string[] strArr = so.Split(','); string code = ""; Random rand = new Random(); for (int i = 0; i < codeLength; i++) { code += strArr[rand.Next(0, strArr.Length)]; } return code; } /// <summary> /// 获取一个随机字符串 /// </summary> /// <param name="count"></param> /// <returns></returns> public static string GetRandomChar(int count) { string[] s = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" }; StringBuilder sb = new StringBuilder(); Random ran = new Random(); for (int i = 0; i < count; i++) { int temp = ran.Next(s.Length); sb.Append(s[temp]); } return sb.ToString(); } /// <summary> /// 获取特定位数的随机数 /// </summary> /// <param name="count"></param> /// <returns></returns> public static string GetRandomNums(int count) { StringBuilder sb = new StringBuilder(); sb.Append('9', count - 1); int min = int.Parse(sb.ToString()) + 1;//最小值 sb.Append(9); int max = int.Parse(sb.ToString());//最大值 Random ran = new Random(); return ran.Next(min, max).ToString(); } /// <summary> /// //获取18位订单编号 /// </summary> /// <returns></returns> public static string GetOrderNum() { Random ran = new Random(); int random = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); return "order" + dateStr + CovertIntToString(random, 4); } /// <summary> /// 获取支付编号 /// </summary> /// <returns></returns> public static string GetPayNum() { Random ran = new Random(); int random1 = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); int random2 = ran.Next(9999);//四位随机数 return CovertIntToString(random1, 4) + dateStr + CovertIntToString(random2, 4); } public static string GetShopNum() { Random ran = new Random(); int random = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); return "shop-" + dateStr + CovertIntToString(random, 4); } /// <summary> /// //获取17位活动编号 /// </summary> /// <returns></returns> public static string GetHuoDongNum() { Random ran = new Random(); int random = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); return "ACT" + dateStr + CovertIntToString(random, 4); } /// <summary> /// //获取购物车产品流水号 /// </summary> /// <returns></returns> public static string GetCartNum() { Random ran = new Random(); int random = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); return "ddpcart" + dateStr + CovertIntToString(random, 4); } /// <summary> /// //获取会员唯一编号 /// </summary> /// <returns></returns> public static string GetVIPNum() { Random ran = new Random(); int random = ran.Next(9999);//四位随机数 string dateStr = DateTime.Now.ToString("yyyyMMddhhmmss"); return "VIP" + dateStr + CovertIntToString(random, 6); } /// <summary> /// 长度不够补0 /// </summary> /// <param name="src"></param> /// <param name="num"></param> /// <returns></returns> public static string CovertIntToString(object src, int num) { StringBuilder sb = new StringBuilder(); sb.Append('0', num); string sTarget = sb.ToString() + src.ToString(); return sTarget.Substring(sTarget.Length - num, num); } private static double EARTH_RADIUS = 6378137.0; /// <summary> /// 获取地球两点之间的距离 /// </summary> /// <param name="lat_a"></param> /// <param name="lng_a"></param> /// <param name="lat_b"></param> /// <param name="lng_b"></param> /// <returns></returns> public static double Gps2m(double lat_a, double lng_a, double lat_b, double lng_b) { double radLat1 = (lat_a * Math.PI / 180.0); double radLat2 = (lat_b * Math.PI / 180.0); double a = radLat1 - radLat2; double b = (lng_a - lng_b) * Math.PI / 180.0; double s = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) + Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2))); s = s * EARTH_RADIUS; s = Math.Round(s * 10000) / 10000; return s; } #endregion #region sql注入攻击 public static string[] words = { "select", "insert", "delete", "count(", "drop table", "update", "truncate", "asc(", "mid(", "char(", "xp_cmdshell", "exec", "master", "net", "and", "or", "where" }; public static string CheckParam(string Value) { Value = Value.Replace("'", ""); Value = Value.Replace(";", ""); Value = Value.Replace("--", ""); Value = Value.Replace("/**/", ""); return Value; } public static string CheckParamThrow(string Value) { for (int i = 0; i < words.Length; i++) { if (Value.IndexOf(words[i], StringComparison.OrdinalIgnoreCase) > 0) { string pattern = string.Format(@"[\W]{0}[\W]", words[i]); Regex rx = new Regex(pattern, RegexOptions.IgnoreCase); if (rx.IsMatch(Value)) throw new Exception("发现sql注入痕迹!"); } } return CheckParam(Value); } /// <summary> /// 查找是否含有非法参数 /// </summary> /// <param name="Value"></param> /// <returns></returns> public static bool CheckParamBool(string Value) { for (int i = 0; i < words.Length; i++) { if (Value.IndexOf(words[i], StringComparison.OrdinalIgnoreCase) > 0) return true; } return false; } #endregion #region IP地址处理 /// <summary> /// 取得客户端真实IP。如果有代理则取第一个非内网地址 /// by flower.b /// </summary> public static string IPAddress { get { string result = String.Empty; result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (result != null && result != String.Empty) { //可能有代理 if (result.IndexOf(".") == -1) //没有“.”肯定是非IPv4格式 result = null; else { if (result.IndexOf(",") != -1) { //有“,”，估计多个代理。取第一个不是内网的IP。 result = result.Replace(" ", "").Replace("'", ""); string[] temparyip = result.Split(",;".ToCharArray()); for (int i = 0; i < temparyip.Length; i++) { if (IsIPAddress(temparyip[i]) && temparyip[i].Substring(0, 3) != "10." && temparyip[i].Substring(0, 7) != "192.168" && temparyip[i].Substring(0, 7) != "172.16.") { return temparyip[i]; //找到不是内网的地址 } } } else if (IsIPAddress(result)) //代理即是IP格式 return result; else result = null; //代理中的内容 非IP，取IP } } string IpAddress = (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != String.Empty) ? HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] : HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; if (null == result || result == String.Empty) result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; if (result == null || result == String.Empty) result = HttpContext.Current.Request.UserHostAddress; return result; } } /// <summary> /// 判断是否是IP地址格式 0.0.0.0 /// </summary> /// <param name="str1">待判断的IP地址</param> /// <returns>true or false</returns> private static bool IsIPAddress(string str1) { if (str1 == null || str1 == string.Empty || str1.Length < 7 || str1.Length > 15) return false; string regformat = @"^d{1,3}[.]d{1,3}[.]d{1,3}[.]d{1,3}$"; Regex regex = new Regex(regformat, RegexOptions.IgnoreCase); return regex.IsMatch(str1); } #endregion #region HTML处理 /// <summary> /// 将html标签转化为特殊字符type=0或特殊字符转化为HTML type=1 /// </summary> /// <param name="vv">源字符串</param> /// <param name="type">转化方式</param> /// <returns></returns> public static string HTML_Trans(string vv,int type) { if (type == 0) { vv = vv.Replace(" ", " "); vv = vv.Replace(" ", " "); vv = vv.Replace(">", ">"); vv = vv.Replace("<", "<"); vv = vv.Replace("&", "&"); vv = vv.Replace("\"", """); vv = vv.Replace("'", "&apos"); } if (type == 1) { vv = vv.Replace(" "," "); vv = vv.Replace(" "," "); vv = vv.Replace(">",">"); vv = vv.Replace("<", "<"); vv = vv.Replace("&","&"); vv = vv.Replace(""","\""); vv = vv.Replace("&apos", "'"); } return vv; } /// <summary> /// 去掉非法html标签 /// </summary> /// <param name="Htmlstring"></param> /// <returns></returns> public static string NoHTML(object html) { if (html == null) return ""; string Htmlstring = html.ToString(); //删除脚本 Htmlstring = Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase); //删除HTML Htmlstring = Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"-->", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"<!--.*", "", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(nbsp|#160);", " ", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase); Htmlstring = Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase); Htmlstring.Replace("<", ""); Htmlstring.Replace(">", ""); Htmlstring.Replace("\r\n", ""); return Htmlstring.Trim(); } #endregion #region cookie操作 /// <summary> /// Cookies赋值 /// </summary> /// <param name="strName">主键</param> /// <param name="strValue">键值</param> /// <param name="strDay">有效天数</param> /// <returns></returns> public static bool setCookieForMIn(string strName, string strValue, int Mintius) { try { HttpCookie Cookie = new HttpCookie(strName); //Cookie.Domain = ".xxx.com";//当要跨域名访问的时候,给cookie指定域名即可,格式为.xxx.com Cookie.Expires = DateTime.Now.AddMinutes(Mintius); Cookie.Value = strValue; System.Web.HttpContext.Current.Response.Cookies.Add(Cookie); return true; } catch { return false; } } /// <summary> /// Cookies赋值 /// </summary> /// <param name="strName">主键</param> /// <param name="strValue">键值</param> /// <param name="strDay">有效天数</param> /// <returns></returns> public static bool setCookie(string strName, string strValue, int strDay) { try { HttpCookie Cookie = new HttpCookie(strName); //Cookie.Domain = ".xxx.com";//当要跨域名访问的时候,给cookie指定域名即可,格式为.xxx.com Cookie.Expires = DateTime.Now.AddDays(strDay); Cookie.Value = strValue; System.Web.HttpContext.Current.Response.Cookies.Add(Cookie); return true; } catch { return false; } } /// <summary> /// 读取Cookies /// </summary> /// <param name="strName">主键</param> /// <returns></returns> public static string getCookie(string strName) { HttpCookie Cookie = System.Web.HttpContext.Current.Request.Cookies[strName]; if (Cookie != null) { return Cookie.Value.ToString(); } else { return null; } } /// <summary> /// 删除Cookies /// </summary> /// <param name="strName">主键</param> /// <returns></returns> public static bool delCookie(string strName) { try { HttpCookie Cookie = new HttpCookie(strName); //Cookie.Domain = ".xxx.com";//当要跨域名访问的时候,给cookie指定域名即可,格式为.xxx.com Cookie.Expires = DateTime.Now.AddDays(-1); System.Web.HttpContext.Current.Response.Cookies.Add(Cookie); return true; } catch { return false; } } #endregion #region 获取当天的最大时间 和 最小时间 /// <summary> /// 获取当天的最大时间 和 最小时间 /// </summary> /// <param name="ty">0：默认为最小时间 1：最大时间</param> /// <returns></returns> public static string getMaxMinTim(int ty = 0) { if (ty == 0) { return DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + " 00:00:00"; } else { return DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + " 23:59:59"; } } #endregion #region 根据身份证 获取年龄 性别 public static PersonForIdCard GetPersonByIdCard(string identityCard) { string birthday = string.Empty; string sex = string.Empty; if (identityCard.Length == 18)//处理18位的身份证号码从号码中得到生日和性别代码 { birthday = identityCard.Substring(6, 4) + "-" + identityCard.Substring(10, 2) + "-" + identityCard.Substring(12, 2); sex = identityCard.Substring(14, 3); } if (identityCard.Length == 15) { birthday = "19" + identityCard.Substring(6, 2) + "-" + identityCard.Substring(8, 2) + "-" + identityCard.Substring(10, 2); sex = identityCard.Substring(12, 3); } int UserAge = DateTime.Now.Year - Convert.ToDateTime(birthday).Year; if (int.Parse(sex) % 2 == 0) { sex = "女"; } else { sex = "男"; } PersonForIdCard P = new PersonForIdCard { Age = UserAge, Sex = sex, Birthday = birthday }; return P; } #endregion public static int GetAgeByDate(DateTime? birthDay) { int age = 0; if (birthDay.HasValue) { age = DateTime.Now.Year - birthDay.Value.Year; if (DateTime.Now.Month < birthDay.Value.Month || (DateTime.Now.Month == birthDay.Value.Month && DateTime.Now.Day < birthDay.Value.Day)) age--; if (age <= 0) { return 0; } return age; } return age; } } public class PersonForIdCard { public int Age { get; set; } public string Sex { get; set; } public string Birthday { get; set; } } }
Aes可逆加密如下：
using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; namespace Hplus.Common { public class AesSecurity { /// <summary> /// AES加密 /// </summary> /// <param name="str">待加密字符串</param> /// <param name="AES_KEY">公钥</param> /// <returns>加密后字符串</returns> public static string AesEncrypt(string str, string AES_KEY) { try { string key = AES_KEY; //分组加密算法 AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(str);//得到需要加密的字节数组 //设置密钥及密钥向量 aes.Key = Encoding.UTF8.GetBytes(key); //aes.IV = Encoding.UTF8.GetBytes(key); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; byte[] cipherBytes = null; using (MemoryStream ms = new MemoryStream()) { using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cipherBytes = ms.ToArray();//得到加密后的字节数组 cs.Close(); ms.Close(); } } return Convert.ToBase64String(cipherBytes); } catch { } return string.Empty; } /// <summary> /// AES解密 /// </summary> /// <param name="str">待解密字符串</param> /// <param name="AES_KEY">公钥</param> /// <returns>解密后字符串</returns> public static string AesDecrypt(string str, string AES_KEY) { try { string key = AES_KEY; byte[] cipherText = Convert.FromBase64String(str); AesCryptoServiceProvider aes = new AesCryptoServiceProvider(); aes.Key = Encoding.UTF8.GetBytes(key); //aes.IV = Encoding.UTF8.GetBytes(key); aes.Mode = CipherMode.ECB; aes.Padding = PaddingMode.PKCS7; byte[] decryptBytes = new byte[cipherText.Length]; using (MemoryStream ms = new MemoryStream(cipherText)) { using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Read)) { cs.Read(decryptBytes, 0, decryptBytes.Length); cs.Close(); ms.Close(); } } return Encoding.UTF8.GetString(decryptBytes).Replace("\0", ""); //将字符串后尾的'\0'去掉 } catch { } return string.Empty; } } }
缓存操作
using System; using System.Web; using System.Collections; using System.Web.Caching; namespace Hplus.Common { public class CacheHelper { /// <summary> /// 获取数据缓存 /// </summary> /// <param name="CacheKey">键</param> public static object GetCache(string CacheKey) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; return objCache[CacheKey]; } /// <summary> /// 设置数据缓存 /// </summary> public static void SetCache(string CacheKey, object objObject) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; objCache.Insert(CacheKey, objObject); } /// <summary> /// 设置数据缓存 /// </summary> public static void SetCache(string CacheKey, object objObject, TimeSpan Timeout) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; objCache.Insert(CacheKey, objObject, null, DateTime.MaxValue, Timeout, System.Web.Caching.CacheItemPriority.NotRemovable, null); } /// <summary> /// 设置数据缓存 /// </summary> public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration) { System.Web.Caching.Cache objCache = HttpRuntime.Cache; objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration); } /// <summary> /// 移除指定数据缓存 /// </summary> public static void RemoveAllCache(string CacheKey) { System.Web.Caching.Cache _cache = HttpRuntime.Cache; _cache.Remove(CacheKey); } /// <summary> /// 移除全部缓存 /// </summary> public static void RemoveAllCache() { System.Web.Caching.Cache _cache = HttpRuntime.Cache; IDictionaryEnumerator CacheEnum = _cache.GetEnumerator(); while (CacheEnum.MoveNext()) { _cache.Remove(CacheEnum.Key.ToString()); } } //另外的一个缓存类库 /// <summary> /// 创建缓存项的文件 /// </summary> /// <param name="key">缓存Key</param> /// <param name="obj">object对象</param> public static void Insert(string key, object obj) { //创建缓存 HttpContext.Current.Cache.Insert(key, obj); } /// <summary> /// 移除缓存项的文件 /// </summary> /// <param name="key">缓存Key</param> public static void Remove(string key) { //创建缓存 HttpContext.Current.Cache.Remove(key); } /// <summary> /// 创建缓存项的文件依赖 /// </summary> /// <param name="key">缓存Key</param> /// <param name="obj">object对象</param> /// <param name="fileName">文件绝对路径</param> public static void Insert(string key, object obj, string fileName) { //创建缓存依赖项 CacheDependency dep = new CacheDependency(fileName); //创建缓存 HttpContext.Current.Cache.Insert(key, obj, dep); } /// <summary> /// 创建缓存项过期 /// </summary> /// <param name="key">缓存Key</param> /// <param name="obj">object对象</param> /// <param name="expires">过期时间(分钟)</param> public static void Insert(string key, object obj, int expires) { HttpContext.Current.Cache.Insert(key, obj, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0)); } /// <summary> /// 获取缓存对象 /// </summary> /// <param name="key">缓存Key</param> /// <returns>object对象</returns> public static object Get(string key) { if (string.IsNullOrEmpty(key)) { return null; } return HttpContext.Current.Cache.Get(key); } /// <summary> /// 获取缓存对象 /// </summary> /// <typeparam name="T">T对象</typeparam> /// <param name="key">缓存Key</param> /// <returns></returns> public static T Get<T>(string key) { object obj = Get(key); return obj == null ? default(T) : (T)obj; } } }
汉字拼音
using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace Hplus.Common { public class FirstCode { /// <summary> /// 在指定的字符串列表CnStr中检索符合拼音索引字符串 /// </summary> /// <param name="CnStr">汉字字符串</param> /// <returns>相对应的汉语拼音首字母串</returns> public static string GetSpellCode(string CnStr) { string strTemp = ""; int iLen = CnStr.Length; int i = 0; for (i = 0; i <= iLen - 1; i++) { strTemp += GetCharSpellCode(CnStr.Substring(i, 1)); } return strTemp; } /// <summary> /// 获取首字符字母 /// </summary> /// <param name="CnStr"></param> /// <returns></returns> public static string GetFirstSpellCode(string CnStr) { string strTemp = ""; int iLen = CnStr.Length; int i = 0; for (i = 0; i <= iLen - 1; i++) { strTemp += GetCharSpellCode(CnStr.Substring(i, 1)); break; } return strTemp; } /// <summary> /// 得到一个汉字的拼音第一个字母，如果是一个英文字母则直接返回大写字母 /// </summary> /// <param name="CnChar">单个汉字</param> /// <returns>单个大写字母</returns> private static string GetCharSpellCode(string CnChar) { long iCnChar; byte[] ZW = System.Text.Encoding.Default.GetBytes(CnChar); //如果是字母，则直接返回首字母 if (ZW.Length == 1) { return CommonMethod.CutString(CnChar.ToUpper(), 1); } else { // get the array of byte from the single char int i1 = (short)(ZW[0]); int i2 = (short)(ZW[1]); iCnChar = i1 * 256 + i2; } // iCnChar match the constant if ((iCnChar >= 45217) && (iCnChar <= 45252)) { return "A"; } else if ((iCnChar >= 45253) && (iCnChar <= 45760)) { return "B"; } else if ((iCnChar >= 45761) && (iCnChar <= 46317)) { return "C"; } else if ((iCnChar >= 46318) && (iCnChar <= 46825)) { return "D"; } else if ((iCnChar >= 46826) && (iCnChar <= 47009)) { return "E"; } else if ((iCnChar >= 47010) && (iCnChar <= 47296)) { return "F"; } else if ((iCnChar >= 47297) && (iCnChar <= 47613)) { return "G"; } else if ((iCnChar >= 47614) && (iCnChar <= 48118)) { return "H"; } else if ((iCnChar >= 48119) && (iCnChar <= 49061)) { return "J"; } else if ((iCnChar >= 49062) && (iCnChar <= 49323)) { return "K"; } else if ((iCnChar >= 49324) && (iCnChar <= 49895)) { return "L"; } else if ((iCnChar >= 49896) && (iCnChar <= 50370)) { return "M"; } else if ((iCnChar >= 50371) && (iCnChar <= 50613)) { return "N"; } else if ((iCnChar >= 50614) && (iCnChar <= 50621)) { return "O"; } else if ((iCnChar >= 50622) && (iCnChar <= 50905)) { return "P"; } else if ((iCnChar >= 50906) && (iCnChar <= 51386)) { return "Q"; } else if ((iCnChar >= 51387) && (iCnChar <= 51445)) { return "R"; } else if ((iCnChar >= 51446) && (iCnChar <= 52217)) { return "S"; } else if ((iCnChar >= 52218) && (iCnChar <= 52697)) { return "T"; } else if ((iCnChar >= 52698) && (iCnChar <= 52979)) { return "W"; } else if ((iCnChar >= 52980) && (iCnChar <= 53640)) { return "X"; } else if ((iCnChar >= 53689) && (iCnChar <= 54480)) { return "Y"; } else if ((iCnChar >= 54481) && (iCnChar <= 55289)) { return "Z"; } else return ("?"); } } }
如果想详细了解汉字拼音及首字母的处理，请参考博客：C# 获取社会统一信用代码 和 C# 获取汉字拼音首字母/全拼
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