Prevent form (or any control) creation

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Hi there.
I'm having a trouble with the authorization system of my application.
I persist the users, roles and permission per role on a MySQL database.
I'm trying to assign permission by object type:
- Menu option (Cool Vista-style menu by Nedim Sabic, great control by the way)
- Forms (I developed a basic form and inherit from that all the other forms)
- Buttons (all the buttons are inherited from a basic class too).

At my base form class, at the LOAD event, I'm checking the authorization for the specific user (based on his/her role):

if (!Autorizaciones.Autorizado(this.Name, _Padre)) // Checks permissions
{
   Autorizaciones.Error(); //Display a message
   Close(); // Close the form
}

But (always a but), even if this works correctly, the form is shown for a few milliseconds.

Is it possible to prevent the creation of the form (or any other object) using another event?

Thanks in advance.

VS2008
MySQL 5.5.10
.NET FrameWork 3.5

Posted 6-Apr-11 7:09am

FernandoUY

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pankajupadhyay29 6-Apr-11 13:31pm

You can not stop the creation of form but you can check the authorization before calling frm.show() method.

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#realJSOP · Accepted Answer · 2011-04-06T07:16:00

Solution 1

0) Do the permission check before even instantiating the form

1) Or you can set the form to be initially hidden (Form.Visible=false;), and only make it visible after the user has been validated.

2) Or you can setup a class that performs the validation and generates an event that your parent form can respond to (and thus instantiate the form AFTER the user has been validated).

Posted 6-Apr-11 7:16am

#realJSOP

Updated 6-Apr-11 7:18am

v3

Comments

FernandoUY 6-Apr-11 13:28pm

Hi John. Thank for your fast reply.

0) Won't work (in my solution), because I need the form created: I use the name of the control to validate.

1) Love it! Really simple
2) BOUGHT IT! This is the best solution! Super-professional!
Tanks John!