public class ArrayND<T>
{
private int[] _lengths;
private Array _array;
public ArrayND(int[] length)
{
_lengths = length;
_array = Array.CreateInstance(typeof(T), _lengths);
}
public T GetValue(int[] index) => (T)_array.GetValue(index);
public void SetValue(T value, int[] index) => _array.SetValue(value, index);
public T[] ToOneD() => _array.Cast<T>().ToArray();
public static ArrayND<T> FromOneD(T[] array, int[] lengths)
{
if (array.Length != lengths.Aggregate((i, j) => i * j))
throw new ArgumentException("Number of elements in source and destination arrays does not match.");
var factors = lengths.Select((item, index) => lengths.Skip(index).Aggregate((i, j) => i * j)).ToArray();
var factorsHelper = factors.Zip(factors.Skip(1).Append(1), (Current, Next) => new { Current, Next }).ToArray();
var res = new ArrayND<T>(lengths);
for (var i = 0; i < array.Length; i++)
res.SetValue(array[i],
factorsHelper.Select(item => i % item.Current / item.Next).ToArray());
return res;
}
public override bool Equals(object obj) =>
(obj is ArrayND<T> ndArray) &&
_lengths.SequenceEqual(ndArray._lengths) &&
_array.Cast<T>().SequenceEqual(ndArray._array.Cast<T>());
public override int GetHashCode() =>
new[] { 17 }
.Concat(_lengths.Select(i => i.GetHashCode()))
.Concat(_array.Cast<T>().Select(i => i.GetHashCode()))
.Aggregate((i, j) => unchecked(23 * i + j));
}
Работает с любым количеством измерений.
Проверьте это:
int I = 2, J = 3, K = 4;
var a = new ArrayND<int>(new[] { I, J, K });
var v = 0;
for (var i = 0; i < I; i++)
for (var j = 0; j < J; j++)
for (var k = 0; k < K; k++)
a.SetValue(++v, new[] { i, j, k });
var b = a.ToOneD();
var c = ArrayND<int>.FromOneD(b, new[] { I, J, K });
Console.WriteLine(a.Equals(c)); // True
или
int I = 2, J = 3;
var a = new ArrayND<int>(new[] { I, J });
var v = 0;
for (var i = 0; i < I; i++)
for (var j = 0; j < J; j++)
a.SetValue(++v, new[] { i, j });
var b = a.ToOneD();
var c = ArrayND<int>.FromOneD(b, new[] { I, J });
Console.WriteLine(a.Equals(c)); // True
или
int I = 2, J = 3, K = 4, M = 5;
var a = new ArrayND<int>(new[] { I, J, K, M });
var v = 0;
for (var i = 0; i < I; i++)
for (var j = 0; j < J; j++)
for (var k = 0; k < K; k++)
for (var m = 0; m < M; m++)
a.SetValue(++v, new[] { i, j, k, m });
var b = a.ToOneD();
var c = ArrayND<int>.FromOneD(b, new[] { I, J, K, M });
Console.WriteLine(a.Equals(c)); // True