Convert a BitArray to Int in C#

Question

In C# I have a BitArray that stores a value of 5 as follows

BitArray bitArray = new BitArray(new int[] { 5});

I want to retrieve the value of 5 from the BitArray as an integer as follows:

int myInt = //some operation on bitArray goes here

What would be a fast method of retrieving it? This operation will be repeated heavily so performance is important.

The answer here has additional checks for length which I don't need https://stackoverflow.com/questions/5283180/how-can-i-convert-bitarray-to-single-int — Caustix, Sep 18 '17 at 19:50

score 2 · Accepted Answer · answered Sep 18 '17 at 19:38

2

Just copy the bit array to an int array and take the first element.

BitArray bitArray = new BitArray(new int[] { 5 });
int[] array = new int[1];
bitArray.CopyTo(array, 0);
int result = array[0];

answered Sep 18 '17 at 19:38

Fruchtzwerg

Is there an equally fast method that doesn't require me to declare an array? – Caustix Sep 18 '17 at 19:45
I don't know a faster solution. Think about using C or C++ if this is not fast enought. – Fruchtzwerg Sep 18 '17 at 20:03
There is no concept of endianness in the solution! – Theodore Zographos Dec 03 '21 at 11:20

1 Answers1