c# application with multiple forms

cracker

Hi

I am trying to learn c# and I am attempting an application with multiple forms.
I have started with a login form which is opened from Program.main using Application.Run(new login()). It has a button to login and then display the main application form if the login is successful. I can get this to work but when I close the login form after displaying the main form the application exits, I presume because I am creating and displaying the main form from within it.
Can someone give me some advice on how to structure an application like this, how do I stop the applcation from shutting down once the first form is closed.


Thanks

Dave

Evil Phil

Post the code you are using to display the main form and hide the login form. I'd imagine the problem is in there.

cracker

From program.main I had

Application.Run(new LoginForm);

When that opens I had a login button which

//Checks user against database and then
//Opens the main screen
MainScreenForm mainScreen = new MainScreenForm();
//Close login screen
this.close();

I understand then that it just returns to Program.main and runs to the end of the application

I have changed it now so that the Program.main opens an MDI form and then pops up a login screen. Depending on the result of the login it then either puts a child form in the MDI form or not if login is invalid.
Is there a better way to structure this kind of thing?

Thanks

Dave

lynchie

cracker wrote: »

From program.main I had

Application.Run(new LoginForm);

When that opens I had a login button which

//Checks user against database and then
//Opens the main screen
MainScreenForm mainScreen = new MainScreenForm();
//Close login screen
this.close();

You only instantiated MainScreenForm.. where do u actually show it and attach it to the message queue...


Your code should be something similar to the following

LoginForm lf = new LoginForm();
Application.Run(lf);

if(lf.WasUserAuthorised)
Application.Run(new MainScreenForm());

cracker

Sorry, I did have the instantiation and show steps in my code, just forgot to include it here. I was doing this from within the login form.

If I do as you suggest then I think the application will also close once the user shuts down the main screen. I would have to keep calling Application.Run in Program.main and that would tie me down to opening them in a particular order.
I am thinking of a scenario where the app starts at one screen (possibly the login but not neccessarily) and then the user can move between multiple forms in the app before deciding to exit

That is why I tried the MDI which opens at the start and just displays the other screens as they are called and the application will continue to run until the controlling MDI is shutdown.

But is there a way to start with a normal form and then keep closing and opening other forms. Do I need some kind of controlling class which keeps the application alive until the user decides to exit?