怎样获取一组汉字的拼音首字母(使用C#)

public string GetChineseSpell(string strText)
{
int len = strText.Length;
string myStr = "";
for(int i=0;i<len;i++)
{
myStr += getSpell(strText.Substring(i,1));
}
return myStr;
}

public string getSpell(string cnChar)
{
byte[] arrCN = Encoding.Default.GetBytes(cnChar);
if(arrCN.Length > 1)
{
int area = (short)arrCN[0];
int pos = (short)arrCN[1];
int 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(int i=0;i<26;i++)
{
int max = 55290;
if(i != 25) max = areacode[i+1];
if(areacode[i]<=code && code<max)
{
return Encoding.Default.GetString(new byte[]{(byte)(65+i)});
}
}
return "*";
}
else return cnChar;
} 

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