为什么需要IList?

why do you need the IList ?

static void SetValue2(this Array a, object value, int i) {
    int[] indices = new int[a.Rank];
    for (int d = a.Rank - 1; d >= 0; d--) {
        var l = a.GetLength(d);
        indices[d] = i % l;
        i /= l
    }
    a.SetValue(value, indices);
}

测试代码:

static void Main(string[] args) {
    int[, ,] arr2 = {   
        {{0,1,2}, {3,4,5}, {6,7,8}}, 
        {{9,10,11}, {12,13,14}, {15,16,17}}, 
        {{18,19,20}, {21,22,23}, {24,25,26}}
    };
    for (int i = 0; i < arr2.Length; i++) {
        arr2.SetValue2(30, i);
    }
}