using System;

using System.Collections.Generic;

using System.Linq;

​

public static class Extensions

{

    public static IEnumerable<T> GetDimension<T>(this Array source, int dimension, params int[] indexes)

    {

        var indexList = indexes.ToList();

        indexList.Insert(dimension, 0);

        indexes = indexList.ToArray();

        for (var i = 0; i < source.GetLength(dimension); i++)

        {

            indexes[dimension] = i;

            yield return (T)source.GetValue(indexes);

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        var test1 = new int[2, 2, 3];

        test1[1, 1, 0] = 1;

        test1[1, 1, 1] = 2;

        test1[1, 1, 2] = 3;

        foreach (var item in test1.GetDimension<int>(2, 1, 1))

        {

            Console.WriteLine(item);

        }

    }

}