big difference with c++ with simple equal operator

[efkefk]

Hello,
When I do that:

tabControl[2].SelectedIndex is equal to 3 for instance
index_of_selected_tab[2] = tabControl[2].SelectedIndex;
tabControl[2].SelectedIndex = 0;

Then, index_of_selected_tab[2] changes value to 0 !!!!!!!!!
In c++, it should be equal to 3.

How to proceed in order to do like in c++ (if I right understood, I am now transmitting by ref, but I would like to transmit by value) ?

[wildfrog]

I'm not able to reproduce your problem and it shouldn't be the way you've described. Maybe you should post your code (or a compilable piece that shows your problem)?

- petter

[efkefk]

Thank you for your answer. Here is the code:

// declare
int[] index_of_selected_tab;
index_of_selected_tab = new int[4];
TabControl[] tabControl;
tabControl = new TabControl[4];

//init
for (i = 0; i < 4; i++)
{
index_of_selected_tab[i] = 0;
tabControl[i] = new TabControl();
}

//later
let's say tabControl[2].SelectedIndex is equal to 3 because I have clicked on the fourth tabpage of tabcontrol[2]

//then when I do this
index_of_selected_tab[2] = tabControl[2].SelectedIndex;
//index_of_selected_tab[2] is now equal to 3 (this makes sence), but when I do this
tabControl[2].SelectedIndex = 0;
//then, index_of_selected_tab[2] changes value to 0 !!!!!!!!!

If not clear, I can send the complete code if possible (just tell me where).

[LooselyBased]

I think you're going to have to post the whole code.

[aniskhan]

can u state what do u want to do.

[boudino]

Do you set index_of_selected_tab[2] in event handler of SelectionIndexChanged of the TabControl? If so, here is your answer: tabControl[2].SelectedIndex = 0 fires the SelectionIndexChanged event, so the value of index_of_selected_tab is reset. Nothing else is possible. Integer is value type - you cannot pass it by reference, so change of one instance cannot be escaled to another.

[aniskhan]

tabControl[2].SelectedIndex = 3;
//index_of_selected_tab[2] gets 3
index_of_selected_tab[2] = tabControl[2].SelectedIndex;
//changed selected index to 0
tabControl[2].SelectedIndex = 0;
////index_of_selected_tab[2] show 3
MessageBox.Show(Convert.ToString ( index_of_selected_tab[2]));

so i didn't got into any problem ,there must be problem anywhere else in your complete code

[efkefk]

Thank you for your help. I found the problem.

It is because I create dynamically the tabControl. And when the tabControl is created, this does not really make sence but the event "SelectionIndexChanged" is called. So the index_of_selected_tab were reset. I was thinking the event "SelectionIndexChanged" should be called only when clicking on a tabPage.

So the solution I found was to save again the index_of_selected_tab under another name before re-creating the tabControl. I am not sure this is the best way but it works.

Thank you again.