Stupid array trick

ArrayForeachElementTrick.cs

static class Program
{
    public static void Main()
    {
        int[] data = new int[12];

        // foreach over refs to the elements of the array
        foreach(ref int elem in data.Refs())
        {
            elem = 1;
        }
    }
}

static class ArrayExtensions
{
    public static ArrayEnumerable<T> Refs<T>(this T[] arr)
    {
        return new ArrayEnumerable<T>(arr);
    }
}

struct ArrayEnumerable<T>
{
    T[] arr;
    int idx;
    public ArrayEnumerable(T[] arr)
    {
        this.arr = arr;
        this.idx = -1;
    }

    public ArrayEnumerable<T> GetEnumerator() {
        return this;
    }

    public bool MoveNext()
    {
        if(++idx < arr.Length)
        {
            return true;
        }
        return false;
    }

    public ref T Current
    {
        get
        {
            return ref arr[idx];
        }
    }
}