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：/**////

/// 判断句子中是否含有中文///

/// 字符串 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：/**////

/// 给定一个字符串，判断其是否只包含有汉字///

/// /// 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;
}/**////

/// 判断一个word是否为GB2312编码的汉字///

/// /// 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;
}
}
}/**////

/// 判断一个word是否为GBK编码的汉字///

/// /// 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;
}
}
}/**////

/// 判断一个word是否为Big5编码的汉字///

/// /// 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;
}
}
}[@more@]

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C#里判断字符串是否为中文

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