Fast2DArray.cs

public struct Fast2DArray<T>
{
    public T[] Data;

    public int Width;
    public int Height;

    public Fast2DArray(T[,] data)
    {
        this.Height = data.GetLength(0);
        this.Width = data.GetLength(1);

        this.Data = new T[this.Width*this.Height];

        // TODO: Flatten data into Data
    }

    public T this[int i, int j]
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            return this.Data[i * this.Width + j];
        }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        set
        {
            this.Data[i * this.Width + j] = value;
        }
    }
}

public class ArrayUser
{
    public static readonly Fast2DArray<bool> Pattern = new Fast2DArray<bool>(
        new bool[,]
            {
                {true, false, true },
                {false, true, false}
            }
        );

    public void Foo()
    {
        var blah = Pattern[1, 0];
        Console.WriteLine(blah);
    }
}