对象C＃的多维数组

Question

I use an array of array :

object[][] of =new object[lenght2][];

Now, what i want is to insert a new array into of[][], I try this :

 for (int i = 0; i < lenght2; i++)
  {
      Act = calcul_resporderbyact(responsable,v); // return array of object
      of[i] = Act;
 }

i want to know how to use some array from this multidimensional-array ??

Answer 1

You have couple of mistakes, in your code object[,] of =new object[lenght2][];

[,] is not equal to [][]

you can try this:

object[][] of = new object[length2][];
of[i] = Act; //it means you can assign `new[] { new object() };`

Read this: Multidimensional Array [][] vs [,]

it says that [,] is multidimensional array and [][] is array of arrays. So for your use array of arrays is valid.

Answer 2

Multidimensional arrays (as opposed to jagged arrays) are always "rectangular", meaning that the length of each entry in the array is also fixed.

If you want just a list of arrays, which can have different lengths, then use List<object[]> as in

List<object[]> l = new List<object[]>();
l.Add(calcul_resporderbyact(responsable,v));

Or you could use a jagged array :

object[][] l = new object[length2][];
l[i] = calcul_resporderbyact(responsable,v);

Answer 3

In C# there are jagged arrays and multidimensional arrays . In your example you seem to be mixing up the two.

Jagged arrays are created this way, and you'll have to construct each "sub-array" individually:

object[][] obj = new object[10][];
obj[0] = new object[10];
obj[1] = new object[10];
...

Multidimensional arrays on the other hand:

object[,] obj = new object[10,10];