字符串转化为数字做异或，谁帮帮忙
string a="0001100";转化为数字后就变成了1100了，改怎么弄啊，一定要数字，因为后面要做异或运算，谁帮帮忙，谢谢
程序代码：using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication19
{
class Program
{
static void Main(string[] args)
{
string a = "0001100";
char combine;
char[] c = a.ToCharArray();
Array.Reverse(c);
for(int i=0;i<c.Length;i++)
{
if (c[i] == 0)
{
continue;
}
else if (c[i] == 1)
{
combine &= 1 << c[i];
}
else { break; }
}
Console.Read();
}
}
}
