How do I create and manage multiple instance names?

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How does one programatically establish an instance name that has a numeric appended to it when you instantiate it?

All I see on the internet regarding using more than one instance of a given class is this kind of example:

SyncJob syncJob1 = new SyncJob();
SyncJob syncJob2 = new SyncJob();
SyncJob syncJob3 = new SyncJob();
SyncJob syncJob4 = new SyncJob();

But what if you don’t know ahead of time how many instances your app will have to create?

I was thinking about doing something like this:

Int jobNumber = 1;
String jobName = “syncJob” + jobNumber.ToString();
jobName = new SyncJob();

But jobName is a string and you can’t use a string to create an instance.

Posted 12-Sep-13 12:58pm

rfresh

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Ron Beyer · Accepted Answer · 2013-09-12T13:06:00

Solution 1

You don't.

You should create a List<syncjob> or an array of SyncJob that stores enough slots for the sync jobs you are using. You then refer to them by index in the array or list.

C#

public class YourClass
{
    private List<SyncJob> _syncJobs = new List<SyncJob>();    //Declare as a member

    public void NewSyncJob() 
    {
        SyncJob sj = new SyncJob();
        //Initialize

        _syncJobs.Add(sj);
    }

    public void SyncJobUser()
    {
        int jobNum = 4;  //Or whatever SyncJob you want to reference, could be a parameter

        _syncJobs[jobNum].Whatever = something;
    }

    public void RemoveSyncJob(SyncJob job)
    {
        _syncJobs.Remove(job);
    }
}

Posted 12-Sep-13 13:06pm

Ron Beyer

Updated 12-Sep-13 14:41pm

v3

Comments

rfresh 12-Sep-13 19:56pm

So, I'm stuck having to still pre-declare the names (syncJob1, syncJob2) like this:

SyncJob syncJob1 = new SyncJob();
SyncJob syncJob2 = new SyncJob();

ahead of time, before use?

Ron Beyer 12-Sep-13 20:39pm

No, I updated the solution with an example, you would just call NewSyncJob each time you needed a new one. When you are finished with it, delete it from the list (using the _syncJobs.Remove(SyncJob) method). You don't need to have separate names for each one.

Sergey Alexandrovich Kryukov 12-Sep-13 20:51pm

My 5. Actually, I currently have no idea how I would explain things to OP, as it looks like a big confusion of everything: the idea of access by name, variables and their names, pre-allocation, all about very basic programming, very far from parallel computing and other more complex things. Yet another case of trying to do something well above one's head and inability to divide work and learning into feasible steps.
—SA

Ron Beyer 12-Sep-13 20:52pm

Thanks Sergey. With the example its probably as far as I can take it without giving a "fundamentals of programming" lesson. I recommend (to the OP) that he picks up a beginners C# book (or even online tutorial) and goes through it.

Sergey Alexandrovich Kryukov 12-Sep-13 22:38pm

Great idea.
—SA

rfresh 12-Sep-13 21:40pm

@SA Sorry my experience it so far below yours. Sorry I am asking newbie questions that you think no one should be asking. I hope it boosts your ego to chime in on a question just to bash the OP. Your comment is not welcome and not needed. If you don't want to answer my question then don't, move on to the next thread. I have watched about 20 hours of C# tutorial videos and have 3 technical manuals. Sorry if that's not enough to allow me to post questions on this board, but I don't believe you make the rules here, and if you do, too bad. Now go away and insult someone else for a change. I don't need your arrogant help and insulting comments.

Sergey Alexandrovich Kryukov 12-Sep-13 22:45pm

There is nothing to sorry about. We all start with little understanding. Probably, your only problem is the pace; you really need to slow down and make smaller more sure and logical steps. It should not slow down your progress, just the opposite. Please see the advice Ron gave you above.

As to your "I don't need...", you are doing a big mistake. The way you talk are too rude to be acceptable. (Read them yourself. Did anyone treated you this way? I don't thins so.)

You get criticism personally and considerably block yourself from learning from others. I call it "playing offended card". The only looser from such behavior is you. Criticism is one of the main driving forces of progress. If someone points out my mistakes or wrong moves, I try to improve myself (or, if I disagree, I argue, without taking it personally), and it does not matter who offered me that criticism. I wish you to do the same.

Best wishes,
—SA