C# copying or accessing two dimensional array from child form

Question

I have created two forms in the designer, formA and formB, one is a default parent form and the latter is a modified "about box". I need to know the best way to get data of a two dimensional array to formB from formA, but so far I've only got it to "work" when formA was inadvertently opened a second time alongside formB.

Basic code at the moment is:

// Form A (onload)
public string[,] arrayname = new string[5, 2] { some values };
// Form A (onevent)
formB f2 = new formB(arrayname);
f2.Show();

// Form B (onload)
???
label1.Text = arrayname[0, 0];
label2.Text = arrayname[0, 1];
label3.Text = arrayname[1, 0];
...

Thanks in advance!

Timon. Z · Accepted Answer · 2011-04-01 13:50:33Z

2

The easiest way for me is to change the child form (FormB) constructor to accept an array of String as parameter :

private string[,] arrayname;
public FormB(string[,] _arrayname)
{
this.arrayname = _arrayname;
}

and when you create your instance of FormB :

formB f2 = new formB(arrayname);
f2.Show();

edited Apr 1, 2011 at 13:50

answered Apr 1, 2011 at 13:26

Timon. Z

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1 Comment

Sorax Over a year ago

+1 This is probably how I would design it. Additionally, I'd make the default constructor private to communicate arrayName needs values for the form to be useful. private FormB(){}

Richard Friend · Accepted Answer · 2011-04-01 13:20:07Z

1

make a public property on FormB

public string [,] SomeArray {get;set;}

Then set it when you display

FormB f = new FormB();
f.SomeArray = this.arrayname;
f.Show();

Then in FormB

this.label1.Text = this.SomeArray[0,0];

answered Apr 1, 2011 at 13:20

Richard Friend

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Comments

FreeAsInBeer · Accepted Answer · 2011-04-01 13:48:27Z

0

Probably the easiest would be to expose it as a property in FormB like so:

public string[,] Hours { get; set; }

And set it right after you create the instance:

FormB myFormB = new FormB();
myFormB.ArrayName = new string[5, 2] { some values };

edited Apr 1, 2011 at 13:48

answered Apr 1, 2011 at 13:19

FreeAsInBeer

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2 Comments

lpd Over a year ago

This seemed to parse an error? 'WindowsFormsApplication1.FormB' does not contain a definition for 'arrayname' and no extension method 'arrayname' accepting a first argument of type 'WindowsFormsApplication1.FormB' could be found (are you missing a using directive or an assembly reference?)

FreeAsInBeer Over a year ago

Edited my answer. You need to create a property for FormB first.

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