Code：获取指定汉字的首字母

/// <summary>
/// 获取指定汉字的首字母
/// </summary>
/// <param name="cnChar"></param>
/// <returns></returns>
public string GetSpell(string cnChar)
{
    var regex = new Regex(@"[^\u4e00-\u9fa5]");
    if (regex.IsMatch(cnChar))
        return cnChar;
    //将汉字转化为ASNI码,二进制序列
    var arrCn = Encoding.Default.GetBytes(cnChar);
    if (arrCn.Length > 1)
    {
        int area = (short)arrCn[0];
        int pos = (short)arrCn[1];
        var code = (area << 8) + pos;
        int[] areacode =
        {
                45217, 45253, 45761, 46318, 46826, 47010,
                47297, 47614, 48119, 48119, 49062, 49324,
                49896, 50371, 50614, 50622, 50906, 51387,
                51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481
            };
        for (var i = 0; i < 26; i++)
        {
            var max = 55290;
            if (i != 25) max = areacode[i + 1];
            if (areacode[i] <= code && code < max)
            {
                return Encoding.Default.GetString(new[] { (byte)(65 + i) });
            }
        }
        return "*";
    }
    else return cnChar;
}