求教，十六进制转二进制并提取值。谢谢！

Question

十六进制字符串"01",转换成二进制，并且我需要取到里面每一位的值也就是里面的0或者1，来判断客户端的状态。我第一次用的方法如下：失败。 int S2 = Convert.ToInt32(_notice.Substring(44, 2), 16);//从16进制字符串中截取出"01",并转化为十进制，
                            string _s2 = Convert.ToString(S2, 2);//将十进制转换为2进制                            char[] _s_2 = _s2.ToCharArray();//赋给数组，取里面八位的值，然后用switch语句判断每一位的值,
                            string out_2 = "";
                            switch (_s_2[0])
                            {
                                case '1':
                                    out_2 = "报警";
                                    break;
                                case '0':
                                    out_2 = "正常";
                                    break;                            }
                            string S2_out_0 = out_2;//欠压，1-报警，0-正常。
                            switch (_s_2[1])
                            {
                                case '0':
                                    out_2 = "无效";
                                    break;
                                case '1':
                                    out_2 = "报警";
                                    break;                            }
                            string S2_out_1 = out_2;//掉电，1-报警，0-无效。
下面是我尝试的第二种方法，又失败了，唉，无计可施，所以发帖求教个现成的方法，急着用，谢谢！
int S1 = Convert.ToInt32(_notice.Substring(44, 2), 16);//从16进制字符串中截取出"01",并转化为十进制，
                            string _s1 = Convert.ToString(S1, 2);//将十进制转换为2进制,然后用Substring(）函数截取里面的相应位的值，无论从左边取还是从右边取里面的值都失败。唉！                                                        string out_1 = "";
                            switch (_s1.Substring(7, 1))
                            {
                                case "0":
                                    out_1 = "未定位";
                                    break;
                                case "1":
                                    out_1 = "已定位";
                                    break;                            }
                            string S1_out_0 = out_1;//定位状态，1-已定位，0-未定位。
                            switch (_s1.Substring(6, 1))
                            {
                                case "0":
                                    out_1 = "正常";
                                    break;
                                case "1":
                                    out_1 = "劫警";
                                    break;                            }

Answer 1

刚想了种方法，就是当它的长度不满八字的时候，比如只有1，那我给它加0；八成不对，连实验的勇气都没有了。
int S1 = Convert.ToInt32(_notice.Substring(42, 2), 16);
                            string _s1 = Convert.ToString(S1, 2);
                            if(_s1.Length<8)
                            {
                               for (int i = 0; i < 8-_s1.Length;i++ )
                               {
                                   //_s1 += "0";
                                   _s1 += "0" + _s1;
                               }
                            }

Answer 2

int S1 = Convert.ToInt32(_notice.Substring(42, 2), 16);
                            string _s1 = Convert.ToString(S1, 2);
                            string _zero = "";
                            if(_s1.Length<8)
                            {
                               for (int i = 0; i < 8-_s1.Length;i++ )
                               {
                                   //_s1 += "0";
                                   _zero += "0";
                                   //_s1 += "0" + _s1;
                               }
                               _s1 = _zero + _s1;
                            }

Answer 3

楼主可能把问题想复杂了，下面是一种办法：
              //十六进制字符串转int
              int i = int.Parse("10", System.Globalization.NumberStyles.HexNumber);
            //转二进制字符串（可能不满8位）
            string str = Convert.ToString(i, 2);
            //转8位长度字符串
            int i2 = int.Parse(str);
            string result = i2.ToString("00000000");
另外楼主可以看看“位运算”，也是一种比较好的方法。

Answer 4

int S2 = Convert.ToInt32(_notice.Substring(44, 2), 16);
int b = 1<<n;// 这个N就是你要检测的第多少位
if( S2&b == 0)
{
      //这里写检测位为0的代码
}
else
{
      //这里写检测为为1的代码
}

Answer 5

很明显 lz是弄gps车台定位的