判断中文

C# 判断中文字符（字符串） 在unicode 字符串中，中文的范围是在4E00..9FFF:CJK Unified Ideographs。通过对字符的unicode编码进行判断来确定字符是否为中文。protected bool  IsChineseLetter(string input,int index){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);if (input != ""){code = Char.ConvertToUtf32(input, index);    //获得字符串input中指定索引index处字符unicode编码if (code >= chfrom && code <= chend){return true;     //当code在中文范围内返回true            }else{return false ;    //当code不在中文范围内返回false            }}return false;}方法二：public bool IsChina(string CString){bool BoolValue = false;for (int i = 0; i < CString.Length; i++){if (Convert.ToInt32(Convert.ToChar(CString.Substring(i, 1))) < Convert.ToInt32(Convert.ToChar(128))){BoolValue = false;}else{return BoolValue = true;}}return BoolValue;}方法三：/**//// <summary>/// 判断句子中是否含有中文/// </summary>/// <param >字符串</param>        public bool WordsIScn(string words){string TmmP;for (int i = 0; i < words.Length; i++){TmmP = words.Substring(i, 1);byte[] sarr = System.Text.Encoding.GetEncoding("gb2312").GetBytes(TmmP);if (sarr.Length == 2){return true;}}return false;}方法四：for (int i=0; i<s.length; i++){Regex rx = new Regex("^[\u4e00-\u9fa5]{1}quot;);if (rx.IsMatch(s))// 是else// 否}正解！\u4e00-\u9fa5 汉字的范围。^[\u4e00-\u9fa5]$ 汉字的范围的正则方法五：unicodeencoding   unicodeencoding   =   new   unicodeencoding();byte   []   unicodebytearray   =   unicodeencoding.getbytes(   inputstring   );for(   int   i   =   0;   i   <   unicodebytearray.length;   i++   ){i++;//如果是中文字符那么高位不为0    if   (   unicodebytearray   !=   0   ){}……方法六：/**//// <summary>/// 给定一个字符串，判断其是否只包含有汉字/// </summary>/// <param name="testStr"></param>/// <returns></returns>        public bool IsOnlyContainsChinese(string testStr){char[] words = testStr.ToCharArray();foreach (char word in words){if ( IsGBCode(word.ToString()) || IsGBKCode(word.ToString()) )  // it is a GB2312 or GBK chinese word                {continue;}else{return false;}}return true;}/**//// <summary>/// 判断一个word是否为GB2312编码的汉字/// </summary>/// <param name="word"></param>/// <returns></returns>        private bool IsGBCode(string word){byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(word);if (bytes.Length <= 1)  // if there is only one byte, it is ASCII code or other code            {return false;}else{byte byte1 = bytes[0];byte byte2 = bytes[1];if (byte1 >= 176 && byte1 <= 247 && byte2 >= 160 && byte2 <= 254)    //判断是否是GB2312                {return true;}else{return false;}}}/**//// <summary>/// 判断一个word是否为GBK编码的汉字/// </summary>/// <param name="word"></param>/// <returns></returns>        private bool IsGBKCode(string word){byte[] bytes = Encoding.GetEncoding("GBK").GetBytes(word.ToString());if (bytes.Length <= 1)  // if there is only one byte, it is ASCII code            {return false;}else{byte byte1 = bytes[0];byte byte2 = bytes[1];if ( byte1 >= 129 && byte1 <= 254 && byte2 >= 64 && byte2 <= 254)     //判断是否是GBK编码                {return true;}else{return false;}}}/**//// <summary>/// 判断一个word是否为Big5编码的汉字/// </summary>/// <param name="word"></param>/// <returns></returns>        private bool IsBig5Code(string word){byte[] bytes = Encoding.GetEncoding("Big5").GetBytes(word.ToString());if (bytes.Length <= 1)  // if there is only one byte, it is ASCII code            {return false;}else{byte byte1 = bytes[0];byte byte2 = bytes[1];if ( (byte1 >= 129 && byte1 <= 254) && ((byte2 >= 64 && byte2 <= 126) || (byte2 >= 161 && byte2 <= 254)) )  //判断是否是Big5编码                {return true;}else{return false;}}}