string 转换成 Char[]
string ss = "abcdefg";
char[] cc = ss.ToCharArray();
Char[] 转换成string
string s = new string(cc);
byte[] 与 string 之间的转换
byte[] bb = Encoding.UTF8.GetBytes(ss);
string s = Encoding.UTF8.GetString(bb);
byte[] 与 char[] 之间的转换
byte[] bb;
char[] cc = Encoding.ASCII.GetChars(bb);
byte[] bb = Encoding.ASCII.GetBytes(cc);