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Question by iagoccampos · Dec 13, 2014 at 03:13 PM · c#arraymultidimensional array

How to get the lenght an array?

I have this code:

 private Vector3[,] roomLocalization = new[,]
 {
    {new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0)},
    {new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0)},
    {new Vector3(0,0,0)}
 };

I dont want to get the lenght of one array like "roomLocalization.GetLength(0)" and I need get the number of lines, in this case are 3.There is a command to get this?

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Answer by Bunny83 · Dec 13, 2014 at 04:11 PM

Since it's a multidimensional array you have to use GetLength(0) for the first dimension and GetLength(1) for the second.

Btw: You don't initialize your array completely. A multidimensional array can't have different length in a dimension. So a 2d-array is always a rectangle / table. It can't have empty cells. A 3d array is always a cube. It sounds like you think you're using jagged arrays (arrays in arrays) but you don't. A jagged array would look like this:

 Vector3[][] myarray;

edit
Here's an example how a jagged array would look like in your case:

 private Vector3[][] roomLocalization = new Vector3[][]
 {
     new Vector3[]{new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0)},
     new Vector3[]{new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0), new Vector3(0,0,0)},
     new Vector3[]{new Vector3(0,0,0)}
 };

Now you have only simple one dimensional arrays. So the "row" count is simply the length of the outer array:

 int numRows = roomLocalization.Length;
 int numCol0 = roomLocalization[0].Length;
 int numCol1 = roomLocalization[1].Length;

 Vector3 v = roomLocalization[1][2];  // 3rd element in 2ed "row" / array


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avatar image iagoccampos · Dec 13, 2014 at 05:03 PM 0
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Humm Thanks, I am php programmer, maybe that has left me confused :D

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Answer by Antony-Blackett · Dec 13, 2014 at 03:13 PM

http://msdn.microsoft.com/en-us/library/2yd9wwz4.aspx

roomLocalization.Length;

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avatar image iagoccampos · Dec 13, 2014 at 04:02 PM 0
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It's giving me 9... I've tried this before... Thank you

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Answer by tanoshimi · Dec 13, 2014 at 04:17 PM

"I dont want to get the lenght of one array like "roomLocalization.GetLength(0). I need get the number of lines, in this case are 3"

The number of "lines", 3, is what roomLocalization.GetLength(0) gives you....

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avatar image Bunny83 · Dec 13, 2014 at 04:24 PM 0
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I'm pretty sure he hasn't realized that in his example he only has two dimensions which has rows ( dim 0 / GetLength(0) ) and columns ( dim 1 / GetLength(1) )

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