Convert an integer to a binary string with leading zeros

Question

I need to convert int to bin and with extra bits.

string aaa = Convert.ToString(3, 2);

it returns 11, but I need 0011

Answer 1

You can use these methods:

public static class BinaryExt
{
    public static string ToBinary(this int number, int bitsLength = 32)
    {
        return NumberToBinary(number, bitsLength);
    }

    public static string NumberToBinary(int number, int bitsLength = 32)
    {
        string result = Convert.ToString(number, 2).PadLeft(bitsLength, '0');

        return result;
    }

    public static int FromBinaryToInt(this string binary)
    {   
        return BinaryToInt(binary);
    }

    public static int BinaryToInt(string binary)
    {   
        return Convert.ToInt32(binary, 2);
    }   
}

Sample:

int number = 3; 
string byte3 = number.ToBinary(8); // output: 00000011

string bits32 = BinaryExt.NumberToBinary(3); // output: 00000000000000000000000000000011