C# Array on Class - access all instances of one element

Question

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New to C# and want to know if there is a way to pass in all occurrences of of an array declared class element?

In other words -

class something()
{
string a;
string b;
}


class abc()
{
protected void main()
{
something s[] = new something[5]
... initialize array

CallRoutine(something.a[]) or
CallRoutine(something[].a)
}

protected void CallRoutine(string[] receiver)
{
loop through string array...
}
}

Posted 9-Feb-11 12:46pm

Steve van Niman

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3 solutions

Solution 2

So are you trying to pass the 'a' members of the array? If so, there is nothing you can get build-in. You have to create an array of all a's to pass. But that defeats the whole purpose. How would you know which a belong to which object? While you can use the index why go all the hard way.

Pass your array and in your method you can do what ever you want to do.

something s[] = new something[5]
... initialize array

CallRoutine(something)

Posted 9-Feb-11 13:07pm

Yusuf

Comments

Sergey Alexandrovich Kryukov 9-Feb-11 19:10pm

If you look at Manfred's answer, he did this already.
--SA

Yusuf 9-Feb-11 19:25pm

Oops, blame it on slow typing. Come on who is going to check if an answer is posted after typing few lines. :-)

Sergey Alexandrovich Kryukov 9-Feb-11 20:31pm

I know, it happens to me all the time :-)
--SA

Solution 3

Here's an answer where I've interpreted your requirement differently to what Manfred did. I am going to assume you want to pass a string array consisting of all the strings obtained by extracting either something.a or something.b. If so, you can do this using LINQ. Here's an example:

C#

class something
{
    public string a;
    public string b;
}

class abc
{
    public static void CallRoutine(string[] receiver)
    {
    }
}

class Program
{
    static void Main(string[] args)
    {
        something[] s = new something[5];
        // init data

        abc.CallRoutine(s.Select(it => it.a).ToArray());
    }
}

Posted 9-Feb-11 14:04pm

Nish Nishant

Comments

Steve van Niman 10-Feb-11 9:44am

Nishant,

This is what I am attempting to do and it almost works... I do like the creativity of using Linq. The Array is passed in correctly and I can do work on the array inside of the CallRoutine; however, upon exit it loses the changes (as it should). I tried using ref to pass a pointer, but I'm getting compiler errors. "A ref or out argument must be an assignable variable".

Nish Nishant 10-Feb-11 9:47am

Well, are you trying to change the member strings? That will not work since strings are immutable.

Espen Harlinn 10-Feb-11 17:22pm

Good answer, my 5

Nish Nishant 10-Feb-11 17:27pm

Thank you.

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Manfred Rudolf Bihy · Accepted Answer · 2011-02-09T13:02:00

Solution 1

It should be like this:

C#

public class Something()
{
    public string a;
    piblic string b;
}


public class Abc()
{
    public  void main()
    {
        Something[] s = new Something[5];
        //... initialize array

        CallRoutine(s);
    }

    protected void CallRoutine(Something[] receiver)
    {
        foreach(Something s in receiver)
        {
            // do something with s an instance of Something here
        }
    }
}

Understandable? If not leave a comment.

Cheers!

Posted 9-Feb-11 13:02pm

Manfred Rudolf Bihy

Comments

Sergey Alexandrovich Kryukov 9-Feb-11 19:12pm

My 5. I suspect OP's idea was deeper; he did not explain the "higher goal".
--SA

Nish Nishant 9-Feb-11 20:04pm

Voted 5. Good response.

Steve van Niman 10-Feb-11 9:39am

Manfred, I'm just trying to pass in one of the elements of the class, not the entire class. Basically I'm trying to map data on input from an Excel spreadsheet into the class. Based on the column in the sheet determines what needs to be done in the class, thus I have to know what the column is. Right now I have a big switch section and then for each column type, have a loop. There are 30 different column types, thus I have 30 loops. Would love to have one loop in a subroutine.

Espen Harlinn 10-Feb-11 17:21pm

Good effort, a 5