can we initialize array by calling parameterized constructor

Question

How to initialize an array of objects by calling the parameterized constructor of the class

Example:

class a
{
    int val;

    //def
    public a()
    {
    }

    //with param
    public a(int value)
    {
        val = value;
    }
}

How to initialize a dynamic array of the above class by using its constructor

eg:

a[] dyArray = new a[size];  // how to call constructor to initialize a value 
                            // other than looping each element and initialize 
                            // it? say, with value 10;

Is there any other standard way to do this?

possible duplicate of [All possible C# array initialization syntaxes](http://stackoverflow.com/questions/5678216/all-possible-c-sharp-array-initialization-syntaxes) — Pierre-Luc Pineault, Sep 10 '15 at 04:25
You can't do it without looping or explicitly providing every element. — Enigmativity, Sep 10 '15 at 04:28
okay. I too think so, just asked to know any solution available or not. Thanks @Enigmativity — Sin, Sep 10 '15 at 04:29
@Pierre-LucPineault - This isn't a duplicate. This is a different question. — Enigmativity, Sep 10 '15 at 04:29

score 1 · Answer 1 · answered Sep 10 '15 at 04:24

1

If you can use a generic list instead you can create the collection and initialise a value:

List<a> aList = new List<a>
{
    new a(10)
};

https://msdn.microsoft.com/en-us/library/bb384062.aspx

answered Sep 10 '15 at 04:24

Steve

9,335
10
49
81

yea, for a list. Thanks for that answer – Sin Sep 10 '15 at 04:30

score 0 · Answer 2 · answered Sep 10 '15 at 04:27

0

try this one:

 a[] dyArray = new a[]{
     new a(1),
     new a(2)
 };

answered Sep 10 '15 at 04:27

VJPPaz

917
7
21

but it is a dynamic array, so this wont be possible in all cases. – Sin Sep 10 '15 at 04:28

score 0 · Answer 3 · edited Nov 02 '22 at 19:37

0

The good old way is like this:

a** dyn_arr_ptr = new a*[size];
for (i = 0; i < size; ++i) {
  dyn_arr_ptr[i] = new a(10); // or it could "new a(i)" more flexibility here in parameter value per instance
}

edited Nov 02 '22 at 19:37

Pradeep Kumar

1,193
1
9
21

answered Oct 31 '22 at 05:50

user20376526

1

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Nov 02 '22 at 17:14

score -1 · Accepted Answer · answered Sep 10 '15 at 04:46

-1

How about this?

var darray = (new int[dzise]).Select(x=>new a(10)).ToArray();

answered Sep 10 '15 at 04:46

Sateesh Pagolu

9,282
2
30
48

can we initialize array by calling parameterized constructor

4 Answers4