Problems with Visual Studio Express 2012

[drwhat]

I was writing a C# Forms document in Express 2012 and came up with an unusual bug. I have some random data I'm displaying in dataform grid that I'm retrieving from an array of classes. If I run the program, the data grid (and the actual array of classes) are all copies of whats stored in array[0]. If I use the debugger and step through the entire process, the variables all contain different data and the datagrid displays this data correctly. Any ideas why that would be the case? Here is some code snippets if that helps at all:

I added 2 classes one called Player, and one called Game. Game contains the following code:

public class Game
    {
        public Player[] player = new Player[16];


        public Game()
        {
            int i;


            for (i = 0; i <player.Length; i++)
            {
                player[i] = new Player();
            }
           
       }
    }

Now my in the Form Document i added this:

 public partial class Form1 : Form
    {
        public Game myGame = new Game();
        public Form1()
        {
            InitializeComponent();
        }

The final thing is the Player class has a function called Initialize player.. it is just a bunch of code using Random to make up some various stats, which i run from the Form1_Load

for (i = 0; i < myGame.player.Length; i++)
            {
                myGame.player[i].InitializePlayer();
            }

AGain if i just run the program myGame.player[0] gets randomized and then 1=15 are just copeis of it. But if i step through it, they are all unique.?!? is this some crazy bug in VSE 2012?

[tabstop]

Guess based on no evidence whatever: did you do something like seed the random number generator off the system clock, then mistakenly reseed every time through the loop instead of just once total?

[Cat]

Guess based on no evidence whatever: did you do something like seed the random number generator off the system clock, then mistakenly reseed every time through the loop instead of just once total?

I'd bet good money that's the problem. If you're using more than one Random object, you shouldn't be - you should make a static member Random object and use that to initialize everything. I bet each copy of InitializePlayer creates its own Random object, and with less than a millisecond to execute all iterations of the loop, it creates the same sequence over and over.

[drwhat]

Thanks for the insight. That was exactly the problem. I didn't think about the fact that Random Class was most likely initializing each object based on the time. Using one Static Random object for all instances worked out perfectly. (The fact that stepping through was causing the time to lag enough to make each one different time seed makes perfect sense).

[Slimtiz]

On visual studio there is a language calld Mvc, does anyone know how it is difrent from C#?

[laserlight]

Slimtiz: please start a new thread to discuss a new topic. Since what you post is related to Visual Studio but not to C# (or C or C++), the Tech Board is likely to be a good place to post it.

Anyway, based on a quick search of the Web, I think this "Mvc" that you see in Visual Studio refers to the Model, View, Controller (MVC) pattern rather than to a programming language.

[Slimtiz]

Thanks you've been helpful.

[Dut_Student]

Model–view–controller (MVC) is a software pattern for implementing user interfaces
The model is the code. It is an object that represents the data. E.g. classes, database table etc.
A view provides/is like the gui. A kind of visual presentation for the model.
A controller accepts the input from the user and commands the models to be executed therefore views are also changed. It provides responses to users from the application.

Repost from quick search-MVC is a way to give order to your code layout. You keep logic in one area and presentation in another. This allow you to unit test more efficiently, find your code faster to upgrade it or fix errors.

ASP webforms is more free form so how ever you structure your architecture is up to you. You could go spaghetti in the design making it hard to maintain and upgrade.

Since MVC separates logic(rules) from presentation (views or ui) if your ui changes but the rules didn't you only have to go to the views to edit the changes. In webform you may have to go to several different areas of the project to make ui changes.Using MVC also makes it easy for someone else to maintain or upgrade your code. The structure is easy to pick up. With webform the person would have you learn your architecture style first and then start editing. That takes way more time than using a structure and well documented paradigm

http://www.dotnet-tricks.com/Tutoria...p.Net-MVC.html - outlines most differences