StringBuilder sb = new StringBuilder(); sb.AppendFormat("{0:X2}", 10); Response.Write(sb); 输出A X2表示十六进制格式（大写），域宽2位，不足的左边填0。 [csharp] view plain copy int[] recvLen = { 10, 11, 12, 13, 14, 15, 16, 17, 18 }; StringBuilder uid = new StringBuilder(); for (int i = 0; i <= recvLen.Length – 1; i++) uid.AppendFormat("{0:X2}\r\n", recvLen[i]); Console.WriteLine(uid.ToString()); 输出： 0A 0B 0C 0D 0E 0F 10 11 12 from:http://blog.csdn.net/joyhen/article/details/41576841
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