C#判断是否为汉字


方法一
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。

C判断是否为汉字 - 大灰狼 - 狼窝日记
protected bool   IsChineseLetter(string input,int index)
{
        const int chfrom = Convert.ToInt32("4e00", 16);    //范围(0x4e00~0x9fff)转换成int(chfrom~chend)
        const int chend = Convert.ToInt32("9fff", 16);
if (input == "")
    return false;
 
        int code = Char.ConvertToUtf32(input, index);    //获得字符串input中指定索引index处字符unicode编码          
        return (code >= chfrom && code <= chend);
  }
或者
for (int i=0; i<s.length; i++)
{
     Regex rx = new Regex("^[\一-\龥]$");
     if (rx.IsMatch(s[i]))
          // 是
     else
          // 否
}
\一-\龥 汉字的范围。
^[\一-\龥]$ 汉字的范围的正则
方法二:
根据具体的编码进行判断
/// <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>
p lic 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
          {
               contin;
          }
          else
          {
               return false;
          }
     }
     return tr;
}

/// <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;
     }

     //判断是否是GB2312
     byte byte1 = bytes[0];
     byte byte2 = bytes[1];
     return (byte1 >= 176 && byte1 <= 247 && byte2 >= 160 && byte2 <= 254);
}

/// <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;
     }


     byte byte1 = bytes[0];
     byte byte2 = bytes[1];
     return ( byte1 >= 129 && byte1 <= 254 && byte2 >= 64 && byte2 <= 254);
}

/// <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;
     }
 
     byte byte1 = bytes[0];
     byte byte2 = bytes[1];
     return ( (byte1 >= 129 && byte1 <= 254) && ((byte2 >= 64 && byte2 <= 126) || (byte2 >= 161 && byte2 <= 254)) );
}





///////////////////////////////////////////

方法二:
http://hi.baidu.com/yhfd/blog/item/3222e1fca22cfb80b901a027.html
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     宁夏大学 张冬 zd4004.blog.163.com
        /// </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]$");
if (rx.IsMatch(s[i]))
// 是
else
// 否
}
正解!
/u4e00-/u9fa5 汉字的范围。
^[/u4e00-/u9fa5]$ 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[i] != 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;
                }
            }
        }

posted @ 2013-01-21 22:23  金虹巴巴  阅读(516)  评论(0编辑  收藏  举报