字符串转16进制

private byte[] String2hex(string stmp) { StringBuilder sbtmp = new StringBuilder(); for (int i = 0; i < stmp.Length; i++) { if (stmp[i] >= '0' && stmp[i] <= '9') { sbtmp.Append(stmp[i]); } else if (stmp[i] >= 'a' && stmp[i] <= 'f') { sbtmp.Append(stmp[i]); } else if (stmp[i] >= 'A' && stmp[i] <= 'F') { sbtmp.Append(stmp[i]); } } if (sbtmp.Length % 2 != 0) sbtmp.Append('0'); byte[] btmp = new byte[sbtmp.Length/2]; byte l,h; for (int i = 0,j = 2; i < sbtmp.Length;) { h = Char2hex(sbtmp[i]); i++; if(i >= sbtmp.Length) break; l = Char2hex(sbtmp[i]); i++; btmp[i-j] = (byte)(h*0x10+l); j++; } return