Re: messenger - C# Discussion Boards

Problem by using an Object and a variable inside another function [modified]

nstk7-Feb-11 2:59

7-Feb-11 2:59

Hello,

trying to build a Windows programm, I 've declared an object in Fornm1.cs by typing

Person[] P = new Person[10];

after a class Person I 've created on another file called Person.cs

Then on the function that is being activated after clicking on a button inside the Form I pass simple numerical values to a member attribute like below:

private void btnObjectAdd_Click(object sender, EventArgs e)
{
    lbltest_i.Text = i.ToString();
    P[i] = new Person();
    P[i].category = i;
    i++;
    if (i == 10)
    {
        for (i = 0; i < 10; i++)
            P[i] = null;
            i = 0;
    }
 }

Thus I get P[0]=0, P[1]=1, ... P[9]=9.

Then I try to call a value of an object on another function like

    private void showToolStripMenuItem_Click(object sender, EventArgs e)
{
   int value = P[2].category;
}

and I get value = 2.

This works perfect.

But if I change

int value = P[2].category;

into

int value = P[i].category;

then I get an error that I should create an object with 'new'.

Variable i is declared as

int i = 0;

outside the functions but inside the
public partial class Form1 : Form

Is that the problem?

modified on Monday, February 7, 2011 1:14 PM

Re: Problem by using an Object and a variable inside another function

musefan7-Feb-11 3:15

musefan

7-Feb-11 3:15

There seems to be something very wrong with your design. But if "i" is declared in the same class as your showToolStripMenuItem_Click code then there should be no reason why that is the problem. Perhaps you need to post more of your code - and please you the PRE tags to format is more readably.

return 5;

Re: Problem by using an Object and a variable inside another function

nstk7-Feb-11 7:19

nstk

7-Feb-11 7:19

Thanks for the 'pre' tip, i was looking for s'thing like that.

I got rid of the confusing 0 by changing the array into

new Person[11]

instead of a 10 dimension. After all, we 've got plenty of memory nowdays $Shucks | :-\$

As a result everything worked fine! It must have been some other mistake, as the one I thought of.

dynamic way to analyse settings

arkiboys7-Feb-11 2:55

arkiboys

7-Feb-11 2:55

How is it possible to make a dynamic system so that everytime a new setting is added to the app.config file, the system can take that into consideration?
For example, my present system, looks in the app.config file and gets the value of a key i.e.

<add key="AllowedTime" value="5"/>
<add key="MyValue" value="10"/>

and the system does checks based on this figures. For example if the retrieved value i.e. 5 is less than the MyValue in the app.config file...

I can go on and add more settings in the app.config file and add the logic to the c# code, but I wonder if there is a generic way so that as long as the setting is entered in such a manor so that the c# code can analyse that without me adding to the c# code each time there is a new setting in the config file.?
What do you think?
Thanks

Re: dynamic way to analyse settings

musefan7-Feb-11 3:08

musefan

7-Feb-11 3:08

Just a quick thought. There may be built in functionality for this kind of thing I don't know of...

<add key="NumberOfValues" value="3"/>
<add key="MyValue1" value="1"/>
<add key="MyValue2" value="2"/>
<add key="MyValue3" value="3"/>

Then in code...

int count = int.Parse(ConfigurationManager.AppSettings["NumberOfValues"]);
for(int i = 1; i <= count; i++)
{
   string setting = ConfigurationManager.AppSettings["MyValue" + i];
//do something with setting value
}

...of course, it depends what you actually plan on doing with these kind of values. I have not needed this functionality before and I imagine the closest thing I would need would probably result in me creating an XML file of some sort

return 5;

Re: dynamic way to analyse settings

#realJSOP7-Feb-11 3:42

#realJSOP

7-Feb-11 3:42

Before doing anything with the settings, you can call the Load() method on the settings object to make sure you're using the latest settings, or you can setup a thread that watches the file, and reloads it when the file changes, or even setuup a thread that loads it every X minutes.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

messenger

om_metab7-Feb-11 1:19

om_metab

7-Feb-11 1:19

how to create own DB emails to used in own messenger