How to convert integer to binary string in C#?

Question

I\'m writing a number converter. How can I convert a integer to a binary string in C# WITHOUT using built-in functions (Convert.ToString does different things b

Answer 1

This is an unsafe implementation:

    private static unsafe byte[] GetDecimalBytes(decimal d)
    {
        byte* dp = (byte*) &d;
        byte[] result = new byte[sizeof(decimal)];
        for (int i = 0; i < sizeof(decimal); i++, dp++)
        {
            result[i] = *dp;
        }
        return result;
    }

And here is reverting back:

    private static unsafe decimal GetDecimal(Byte[] bytes)
    {
        if (bytes == null)
            throw new ArgumentNullException("bytes");

        if (bytes.Length != sizeof(decimal))
            throw new ArgumentOutOfRangeException("bytes", "length must be 16");

        decimal d = 0;
        byte* dp = (byte*)&d;
        byte[] result = new byte[sizeof(decimal)];
        for (int i = 0; i < sizeof(decimal); i++, dp++)
        {
            *dp = bytes[i];
        }
        return d;
    }