C# pass int[] (array) with and without ref

Bulgari boy

I'm a little confused about this because I've read about an int[] array, even though int is a primitive type, since it's an array, it's a reference type variable.

What is the difference between such methods:

public static void ChangeSomething(ref int[] array)
{
     array[0] = 100;
}

and

public static void ChangeSomething(int[] array)
{
     array[0] = 100;
}

After modifying the array, I can see the new value 100 at index 0 for both calls.

What's going on under the covers that make a difference? Does the VS IDE allow both just because the "ref" keyword clarifies the intent?

light armored vehicle

The difference is that you can assign primitive variables directly in the method. If you change the method to this:

public static void ChangeSomething(ref int[] array)
{
     array = new int[2];
}

and call it like this:

var myArray = new int[10];
ChangeSomething(ref myArray);

Console.WriteLine(array.Length);

You will see that myArraythe length is only 2 after the call. Without refthe keyword, you can only change the contents of the array, because the reference to the array is copied into the method.

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