得到中文字符串首拼

public static string GetFirstLetter(string str)
{
char t1;
string val="";
for (int i=0;i<str.Trim().Length;i++)
{
t1=Convert.ToChar(str.Trim().Substring(i,1));
if (Ascii(t1)>=Ascii('!') && Ascii(t1)<=Ascii('~'))
val+=t1;
else if (Ascii(t1)>=Ascii('啊') && Ascii(t1)<Ascii('芭'))
val+="A";
else if (Ascii(t1)>=Ascii('芭') && Ascii(t1)<Ascii('擦'))
val+="B";
else if (Ascii(t1)>=Ascii('擦') && Ascii(t1)<Ascii('搭'))
val+="C";
else if (Ascii(t1)>=Ascii('搭') && Ascii(t1)<Ascii('蛾'))
val+="D";
else if (Ascii(t1)>=Ascii('蛾') && Ascii(t1)<Ascii('发'))
val+="E";
else if (Ascii(t1)>=Ascii('发') && Ascii(t1)<Ascii('噶'))
val+="F";
else if (Ascii(t1)>=Ascii('噶') && Ascii(t1)<Ascii('哈'))
val+="G";
else if (Ascii(t1)>=Ascii('哈') && Ascii(t1)<Ascii('击'))
val+="H";
else if (Ascii(t1)>=Ascii('击') && Ascii(t1)<Ascii('喀'))
val+="J";
else if (Ascii(t1)>=Ascii('喀') && Ascii(t1)<Ascii('拉'))
val+="K";
else if (Ascii(t1)>=Ascii('拉') && Ascii(t1)<Ascii('妈'))
val+="L";
else if (Ascii(t1)>=Ascii('妈') && Ascii(t1)<Ascii('拿'))
val+="M";
else if (Ascii(t1)>=Ascii('拿') && Ascii(t1)<Ascii('哦'))
val+="N";
else if (Ascii(t1)>=Ascii('哦') && Ascii(t1)<Ascii('啪'))
val+="O";
else if (Ascii(t1)>=Ascii('啪') && Ascii(t1)<Ascii('期'))
val+="P";
else if (Ascii(t1)>=Ascii('期') && Ascii(t1)<Ascii('然'))
val+="Q";
else if (Ascii(t1)>=Ascii('然') && Ascii(t1)<Ascii('撒'))
val+="R";
else if (Ascii(t1)>=Ascii('撒') && Ascii(t1)<Ascii('塌'))
val+="S";
else if (Ascii(t1)>=Ascii('塌') && Ascii(t1)<Ascii('挖'))
val+="T";
else if (Ascii(t1)>=Ascii('挖') && Ascii(t1)<Ascii('昔'))
val+="W";
else if (Ascii(t1)>=Ascii('昔') && Ascii(t1)<Ascii('压'))
val+="X";
else if (Ascii(t1)>=Ascii('压') && Ascii(t1)<Ascii('匝'))
val+="Y";
else if (Ascii(t1)>=Ascii('匝'))
val+="Z";
else 
val+="-";
}
return val;
}

public static int Ascii(char chr)
{
System.Text.Encoding ecode=System.Text.Encoding.GetEncoding("GB18030");
Byte[] codeBytes=ecode.GetBytes(chr.ToString().Trim());
if (codeBytes.Length==2)
{
return (int)codeBytes[0]*256+(int)codeBytes[1]-65536;
}
else
{
return (int)codeBytes[0];
}
}

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