有没有办法将一个整型3d数组保存为C#中的哈希表的值？

int[,,] array3D = new int[2, 2, 2] { { { 1, 2 }, { 3, 4 } }, { { 5, 6 }, { 7, 8 } } };

Hashtable hashtable = new Hashtable();
StringBuilder sb = new StringBuilder();

for (int i = 0; i < array3D.GetLength(0); i++)
{
    for (int j = 0; j < array3D.GetLength(1); j++)
    {
        for (int k = 0; k < array3D.GetLength(2); k++)
        {
            sb.Append(array3D[i, j, k]);
            sb.Append(",");
        }
    }
}

hashtable.Add("array3D", sb.ToString());

// 当需要使用时，可以将字符串解析为整型3D数组
string value = (string)hashtable["array3D"];
string[] elements = value.Split(',');

int[,,] newArray3D = new int[2, 2, 2];
int index = 0;

for (int i = 0; i < newArray3D.GetLength(0); i++)
{
    for (int j = 0; j < newArray3D.GetLength(1); j++)
    {
        for (int k = 0; k < newArray3D.GetLength(2); k++)
        {
            newArray3D[i, j, k] = int.Parse(elements[index]);
            index++;
        }
    }
}