C# how to write long type array to binary file

Question

I have a long array. How to write this array to a binary file? Problem is that if I convert it into byte array some values are changed.

The array is like:

long array = new long[160000];

Give some code snippet.

Answer 1

The BinaryFormatter will be the easiest.

Also valuetypes (I assume this is what you mean by long), serializes very efficiently.

Answer 2

var array = new[] { 1L, 2L, 3L };
using (var stream = new FileStream("test.bin", FileMode.Create, FileAccess.Write, FileShare.None))
using (var writer = new BinaryWriter(stream))
{
    foreach (long item in array)
    {
        writer.Write(item);
    }
}