[Resolved] - Duplicate Int[]

[Megistal]

I want to duplicate an array of int[] into another one.
(If the array is NULL, then have the new array be NULL, if it contain X elements, then have the new array contain X elements also)

Is there a build in function to do that?
I've try copyTo and Clone without success.

Thks

[Megistal]

pfffff instead of looking around for hours I've made my own function to do it.

private int[] copierTableauInt (int[] intLeTableau) {
    if (intLeTableau == null) return (null); // Tableau Non-instancié
    int[] intretTableau = new int[intLeTableau.Length];
    // itérations sur tous les éléments int du tableau source
    for (int i = 0; i < intLeTableau.Length; ++i) {
        intretTableau[i] = intLeTableau[i];
    }
    return (intretTableau);
}

[jmcilhinney]

Why would you not just use CopyTo? Just create another array of the same length and type and then call:

arr1.CopyTo(arr2, 0)

[Megistal]

That's the problem, I don't know in advance what will be the size of the source array. And it could be a null one. So using myArray.Length to create a new array could end up with an error.

[jmcilhinney]

int[] arr1;
int[] arr2;

if (arr1 == null)
{
    arr2 = null;
}
else
{
    arr2 = Array.CreatInstance(typeOf(Int32), arr1.Length);
    arr1.CopyTo(arr2, 0);
}

[Megistal]

And if I was to use if to detect the presence of null array each time I need to copy an array it would be a very unbeautiful code. Now I have only one line of code to copy an entire array. Not quite rapid but it doesn't matter for this kind of project.

[Megistal]

Aahahha you post what I was writing to avoid at that time!

That's definitely what I don't want. I must copy quite a few array. I want also to reduce redundancy of my code.

[jmcilhinney]

OK I missed that bit earlier, but you should still use that code or something similar in a function of your own that you can then call from anywhere.

[Megistal]

I guess the copyTo don't create the array, it must already be created. I prefer using built-in code which often result in a more efficient, more beautiful and a less error prone code.

Aahahha you post what I was writing to avoid at that time!

Just a coincidence that both of use wrote a reply at the same time and not knowing that the other was doing the same. This remind me kind of bug you can have with a dabatase ehhehe

[jmcilhinney]

Well, there is also the Clone method, but that's an instance member so you can't use it if your original array is a null reference. You could do this though I guess:

int[] newArray = (oldArray == null ? null : oldArray.Clone());

[Megistal]

Yes it's becoming more and more elegant

I didn't though of that one, pretty nice

int[] newArray = (oldArray == null ? null : oldArray.Clone());

[jmcilhinney]

You would probably have to cast the return value of Clone as int[] also.