How do you get the width and height of a multi-dimensional array if i use it into Jagged Arrays?

Question

I have an Array where i want to know each array length.

public int[][,] _EnemyPosition = new int[][,]
{
    new int[,]{ {0},{1},{2},{3},{4}},
    new int[,]{ {0,6},{1,7},{2,8},{3,9},{4,10}},
};

Debug.Log(_EnemyPosition.Length); // Output is 2
Debug.Log(_EnemyPosition[1].GetLength(0)); // Output is 5

But i am not able to get

 Debug.Log(_EnemyPosition[1][0].length);

Its throw me an error

error CS0022: Wrong number of indexes `1' inside [], expected `2'

i want to know how to get length of this array

_EnemyPosition[1][0].length

Answer 1

var length = _EnemyPosition[0].Length; //returns 5 (5·1)
var length = _EnemyPosition[1].Length; //returns 10 (5·2)

Is that what you want? Your requirement is far from clear:

i want to know how to get length of this array: _EnemyPosition[1][0].length

That is not an array, _EnemyPostion[1] is a two dimensional array [,] . Consider the following analogue scenario:

int[,] myTwoDimensionalArray = ...
var whatever = myTwoDimensionalArray[0]; //not valid, array dimensiones don't match.

So, we have three options when it comes to the length you want returned:

1. _EnemyPosition[1].Length which returns the total length of the two dimensional array 10 .
2. _EnemyPosition[1].GetLength(0) which returns the length of the first dimension of the two dimensional array 5
3. _EnemyPosition[1].GetLength(1) which returns the length of the second dimension of the two dimensional array 2

And obviously the result of 2 times 3 is 1 . So, which one do you want?

Answer 2

Let's disentangle the arrays: you have

 int[][,] _EnemyPosition

which is an array of 2d arrays ; so you can call

 _EnemyPosition.Length 

which is number of 2d arrays in total; for each 2d array at index position you can call

 _EnemyPosition[index].GetLength(0)
 _EnemyPosition[index].GetLength(1)

which are the lengths of each dimensions (lines and columns) within index s 2d array. Please notice, that jagged array and 2d array are different types; that's why you can't put

 // doesn't compile
 _EnemyPosition[1][0]

since _EnemyPosition[1] returns 2d array which wants 2 indexes (something like _EnemyPosition[1][0,1] )