/// <summary>
/// 通过汉字区位码得到其首字母(小写)
/// </summary>
/// <param name="nCode">汉字编码</param>
/// <returns></returns>
public string FirstLetter(int nCode) {
if (nCode >= 1601 && nCode < 1637) return "a";
if (nCode >= 1637 && nCode < 1833) return "b";
if (nCode >= 1833 && nCode < 2078) return "c";
if (nCode >= 2078 && nCode < 2274) return "d";
if (nCode >= 2274 && nCode < 2302) return "e";
if (nCode >= 2302 && nCode < 2433) return "f";
if (nCode >= 2433 && nCode < 2594) return "g";
if (nCode >= 2594 && nCode < 2787) return "h";
if (nCode >= 2787 && nCode < 3106) return "j";
if (nCode >= 3106 && nCode < 3212) return "k";
if (nCode >= 3212 && nCode < 3472) return "l";
if (nCode >= 3472 && nCode < 3635) return "m";
if (nCode >= 3635 && nCode < 3722) return "n";
if (nCode >= 3722 && nCode < 3730) return "o";
if (nCode >= 3730 && nCode < 3858) return "p";
if (nCode >= 3858 && nCode < 4027) return "q";
if (nCode >= 4027 && nCode < 4086) return "r";
if (nCode >= 4086 && nCode < 4390) return "s";
if (nCode >= 4390 && nCode < 4558) return "t";
if (nCode >= 4558 && nCode < 4684) return "w";
if (nCode >= 4684 && nCode < 4925) return "x";
if (nCode >= 4925 && nCode < 5249) return "y";
if (nCode >= 5249 && nCode < 5590) return "z";
return "";
}
/// <summary>
/// 判断是否为汉字
/// </summary>
/// <param name="chrStr">待检测字符串</param>
/// <returns>是汉字返回true</returns>
public bool IsChineseCharacters(string chrStr) {
Regex CheckStr = new Regex("[\u4e00-\u9fa5]");
return CheckStr.IsMatch(chrStr);
}
/// <summary>
/// 得到每个汉字的字首拼音码字母(小写)
/// </summary>
/// <param name="chrStr">输入字符串</param>
/// <returns>返回结果</returns>
private string ChangeByName(string chrStr) {
string strHeadString = string.Empty;
Encoding gb = System.Text.Encoding.GetEncoding("gb2312");
for (int i = 0; i < chrStr.Length; i++) {
//检测该字符是否为汉字
if (!IsChineseCharacters(chrStr.Substring(i, 1))) {
strHeadString += chrStr.Substring(i, 1);
continue;
}
byte[] bytes = gb.GetBytes(chrStr.Substring(i, 1));
string lowCode = System.Convert.ToString(bytes[0] - 0xA0, 16);
string hightCode = System.Convert.ToString(bytes[1] - 0xA0, 16);
int nCode = Convert.ToUInt16(lowCode, 16) * 100 + Convert.ToUInt16(hightCode, 16); //得到区位码
strHeadString += FirstLetter(nCode);
}
return strHeadString;
}
asp.net获取中文汉字的首字母