pasar de binario a decimal, C#

pasar de binario a decimal

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            
            int n = 1100111;
            
            int [] a = new int [] {1,1,0,0,1,1,1};
           
            double x = 0;
            int j = a.Length-1;
            
            for ( int i = 0; i < a.Length ; i++ )
            { 
                
                 x += a[i]*Math.Pow(2,j);
                    j -= 1;
                    
              
                
                      
              
              }
            
                      Console.WriteLine(x);
                   
                 
            
           }
      }
    
        
 }


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