Size an array within a class array in C#

Question

I got a class which holds an array and another object:

public class MyClass
{
    public double[] myArray;
    public int otherObject;
};

Now I want to create different array instances of that class:

static void Main(string[] args)
{
    MyClass[] classArray1 = new MyClass[classArraySize1]
    MyClass[] classArray2 = new MyClass[classArraySize2]
};

But how do I size myArray for every classArray individually?

They should be assigned values like this later:

classArray1[i].myArray[j] = 1.0;
classArray2[n].myArray[k] = 2.0;

What is the question? Btw you've not even initialized your array with instances of MyClass. — Sriram Sakthivel
– Sriram Sakthivel, Commented Jan 25, 2016 at 17:44

TVOHM · Accepted Answer · 2016-01-25 17:59:22Z

1

You can add a constructor to your class that you can use to initialize the array to a given size:

public class MyClass
{
    public double[] myArray;
    public int otherObject;

    public MyClass(int size)
    {
        myArray = new double[size];
    }
}

You can then set the size of myArray for an array of MyClass with something like:

int numMyClasses = 123;
int sizeMyArray = 456;

// Manually
MyClass[] classArray1 = new MyClass[numMyClasses];
for (int i = 0; i < numMyClasses; i++)
    classArray1[i] = new MyClass(sizeMyArray);

// LINQ
MyClass[] classArray2 = new MyClass[numMyClasses]
    .Select(x => new MyClass(sizeMyArray)).ToArray();

answered Jan 25, 2016 at 17:59

TVOHM

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1 Comment

C4d Over a year ago

Lol. You arnt reinventing the wheel... you are building a time machine :D.

mike · Accepted Answer · 2016-01-25 17:47:07Z

0

You can set them on the fly like this

static void Main(string[] args)
{
    MyClass[] classArray1 = new MyClass[classArraySize1]
    MyClass[] classArray2 = new MyClass[classArraySize2]

    classArray1[i].myArray = new double[whatever_size_you_want];
    classArray2[i].myArray = new double[whatever_size_you_want];
};

answered Jan 25, 2016 at 17:47

mike

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Comments

Jiri Sykora · Accepted Answer · 2016-01-25 17:49:05Z

0

You can use this:

MyClass[] classArray1 =
{
    new MyClass { myArray = new double[classArraySize1] },
    new MyClass { myArray = new double[classArraySize1] }
};

MyClass[] classArray2 =
{
    new MyClass { myArray = new double[classArraySize2] },
    new MyClass { myArray = new double[classArraySize2] }
};

answered Jan 25, 2016 at 17:49

Jiri Sykora

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Comments

C4d · Accepted Answer · 2016-01-25 17:59:15Z

0

A constructor is (in my opinion) the best way to go.

public class MyClass
{
    public double[] myArray;
    public int otherObject;

    public MyClass(int ArraySize)
    {
        myArray = new double[ArraySize];
    }
}

static void Main(string[] args)
{
    MyClass custom1 = new MyClass(10); // <-- new instance of your class
    custom1.myArray // <-- holds your array
    custom1.otherObject // <-- holds your object
}

answered Jan 25, 2016 at 17:59

C4d

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