How to create void's array?

Question

1.00/5 (1 vote)

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C#

void[] Stack01 = { Card01(),Card02() };  <<<<<<?????????

        public void Card01()
        {
            point = 1;
        }
        public void Card02()
        {
            point = 2;
        }

What I have tried:

i dont lie, i tried the code and didnt work. :)

Posted 7-Dec-16 6:08am

_Q12_

Updated 7-Dec-16 7:43am

Patrice T

v6

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Comments

[no name] 7-Dec-16 12:10pm

You seriously need to learn how to ask a question.

_Q12_ 7-Dec-16 12:11pm

:) english = my second lang. :)
But, feel free to -reformulate-.

[no name] 7-Dec-16 12:16pm

So what?

[no name] 7-Dec-16 12:23pm

Reformulate what? Reformulate "didn't work"? How can anyone but you do that? We can't read your mind. You would think after 9 years you would know this by now.

3 solutions

Solution 2

Instead of using void or a user defined delegate you can use the System.Action delegate (available since .NET 3.5):

C#

class Test
    {
        readonly Action[] Stack01;
        int point;

        public Test()
        {
            Stack01 = new Action[] { Card01, Card02 };
        }    
            
        // Invoke card with index
        public void Card(int index)
        {
            Stack01[index - 1]();
        }

        public void Card01()
        {
            point = 1;
        }
        public void Card02()
        {
            point = 2;
        }
    }

Posted 7-Dec-16 7:40am

Henrik Jonsson

Comments

_Q12_ 7-Dec-16 13:50pm

thanks!

Solution 3

I strongly suggest you download .NET Book Zero by Charles Petzold[^] and spend some time learning C# properly.

Posted 7-Dec-16 7:42am

Richard MacCutchan

Comments

_Q12_ 7-Dec-16 13:47pm

I had downloaded the book. I will read it(i hope).
Though, I must mention, I do programming by fun, and if I can learn something new along the way...eh... but, I will never be a (real) programmer. I have that feeling. :)
Thank you for your nice gift.

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OriginalGriff · Accepted Answer · 2016-12-07T06:26:00

Solution 1

You can't create a array of void - it's a special keyword that means "returns no value" and it's not a data type at all. You can only create arrays of reference and value types, both of which are derived from object and void is neither of those.

What you are trying to do is set up an array of delegates that return no value:

C#

private delegate void pd();

Then you can use them in your code:

C#

pd[] stack01 = { Card01, Card02 };

C#

stack01[0]();
Console.WriteLine(point);
stack01[1]();
Console.WriteLine(point);

Posted 7-Dec-16 6:26am

OriginalGriff

v2

Comments

_Q12_ 7-Dec-16 12:38pm

wow, very cool !
but I get Red squiggly lines inside the array declaration.
"A field initializer cannot reference the non-static field, method, or property ..."
I am using VS2010 - not the latest version.

OriginalGriff 7-Dec-16 12:46pm

That's because you put the declaration outside a method, and the initialise is trying to reference non-static (i.e. class instance specific) methods.
If you need to use non-static methods, then you can't use an initialiser outside a non-static method.
Try this:

private delegate void pd();
private pd[] stack01 = null;

and then put this in your class constructor:

stack01 = new pd[]{ Card01, Card02 };

_Q12_ 7-Dec-16 13:01pm

uuuh - thank you so much!
I've made them public to be seen from outside the object!
And is working like a charm.
Truly WOW !
Amazing!
Thank you!

OriginalGriff 7-Dec-16 14:00pm

You're welcome!