C#实现判断字符是否为中文

C#实现判断字符是否为中文

(2012-08-14 14:25:28)
标签:

gb2312

big5编码

gbk编码

判断

汉字

杂谈

分类: 技术
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]$");

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 ></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 ></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 ></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 ></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;

}

}