C#判断中文字符

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;

}

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;

}

 /// <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： 程序代码

for (int i=0; i<s.length; i++)

{

Regex rx = new Regex("^[/u4e00-/u9fa5]___FCKpd___4quot;);

if (rx.IsMatch(s[i]))

// 是

else

// 否

}

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   )

{

}

……

/// <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;

}

}

}