Arraylist of arrays

[wolima]

I have to create a arraylist of arrays. So, at the end, I have to
convert this arraylist in a two dimmensional array.

I wrote something like this.


ArrayList myAL = new ArrayList();
double[] cvt = new double[3];

cvt[0] = 0.0; cvt[1] = 1.01; cvt[2] = 2.02;
myAL.Add(cvt.Clone());

cvt[0] = 10.0; cvt[1] = 11.11; cvt[2] = 22.22;
myAL.Add(cvt.Clone());

double[] myInt = (double[]) myAL.ToArray(typeof(double[]));

But something is wrong when I convert the arraylist in a two
dimmensional array.

Is there a better way to do that?
What is wrong in the convertion line?

Thanks

 

[Morten Wennevik [C# MVP]]

Hi Wolima,

Your last line is wrong. myAl contains a list of double[]. When you are calling ToArray() on myAl it doesn't return just a single double[] butan array of them. Change the last line to

double[][] myInt = (double[][])myAL.ToArray(typeof(double[]));

I have to create a arraylist of arrays. So, at the end, I have to
convert this arraylist in a two dimmensional array.

I wrote something like this.


ArrayList myAL = new ArrayList();
double[] cvt = new double[3];

cvt[0] = 0.0; cvt[1] = 1.01; cvt[2] = 2.02;
myAL.Add(cvt.Clone());

cvt[0] = 10.0; cvt[1] = 11.11; cvt[2] = 22.22;
myAL.Add(cvt.Clone());

double[] myInt = (double[]) myAL.ToArray(typeof(double[]));

But something is wrong when I convert the arraylist in a two
dimmensional array.

Is there a better way to do that?
What is wrong in the convertion line?

Thanks

 

[wolima]

Thanks Morten, for your help.

Hi Wolima,

Your last line is wrong. myAl contains a list of double[]. When you are calling ToArray() on myAl it doesn't return just a single double[] but an array of them. Change the last line to

double[][] myInt = (double[][])myAL.ToArray(typeof(double[]));

I have to create a arraylist of arrays. So, at the end, I have to
convert this arraylist in a two dimmensional array.

I wrote something like this.

ArrayList myAL = new ArrayList();
double[] cvt = new double[3];

cvt[0] = 0.0; cvt[1] = 1.01; cvt[2] = 2.02;
myAL.Add(cvt.Clone());

cvt[0] = 10.0; cvt[1] = 11.11; cvt[2] = 22.22;
myAL.Add(cvt.Clone());

double[] myInt = (double[]) myAL.ToArray(typeof(double[]));

But something is wrong when I convert the arraylist in a two
dimmensional array.

Is there a better way to do that?
What is wrong in the convertion line?

Thanks

--
Happy coding!
Morten Wennevik [C# MVP]- Ocultar texto entre aspas -

- Mostrar texto entre aspas -

 

[Alun Harford]

I have to create a arraylist of arrays. So, at the end, I have to
convert this arraylist in a two dimmensional array.

I wrote something like this.

double[] myInt = (double[]) myAL.ToArray(typeof(double[]));

As Morten said, in this line you want to be casting to double[][].

It should be pointed out that ArrayList is basically obsolete. If you
had used List<double[]> instead, you would have got a nice meaningful
compiler error.

Alun Harford