未知维数组上的C#循环

如果不关心索引,只需在 System.Array 完全不知道它的等级。枚举器将命中每个元素。

public class Program
{
    public static void IterateOverArray(System.Array a)
    {
        foreach (var i in a)
        {
            Console.WriteLine(i);
        }
    }

    public static void Main()
    {
        var tests = new System.Array []
        {
            new int[] {1,2,3,4,5,6,7,8},
            new int[,]
            {
                {1,2},{3,4},{5,6},{7,8}
            },
            new int[,,]
            {
                {  {1,2},{3,4} },
                {  {5,6},{7,8} }
            }
        };


        foreach (var t in tests)
        {
            Console.WriteLine("Dumping array with rank {0} to console.", t.Rank);
            IterateOverArray(t);
        }
    }
}

输出:

Dumping array with rank 1 to console.
1
2
3
4
5
6
7
8
Dumping array with rank 2 to console.
1
2
3
4
5
6
7
8
Dumping array with rank 3 to console.
1
2
3
4
5
6
7
8

Link to DotNetFiddle example

foreach 利用 yield

public static IEnumerable<T> GetRank<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);
   }
}

用法

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.GetRank<int>(2,1,1))
{
  Console.WriteLine(item);
}

输出

1
2
3

Full demo here