C#-APP: Stopping child event in parent?

[imajin]

Hi, I was wondering if you guys can help me sort this out. I've basically got a custom button which inherits from the Button class, and this button is used throughout my forms. The custom button has a state 'permission' and what basically happens is that if this button is clicked on any form, it checks if the button has an associated 'permission', and the event action in the child form must only be fired if the person clicking the button has that 'permission'. My code currently looks something like this (simplified, of course):

public class MyButton : Button
{
  private string permission;
 
  public MyButton() : base
  {
    this.Click += new EventHandler(MyButton_Click);
  }
 
  public string Permission
  {
    set
    {
      this.permission = value;
    }
  }
 
  private bool PersonHasPermission(permission)
  {
    //checks if the person has the permission
  }
 
  private void MyButton_Click(object sender, EventArgs e)
  {
    if (permission != null && permission != "")
    {
      if (!PersonHasPermission(permission))
      {
        //what do i put here to stop the event in MyForm from firing further?
      }
    }
  }
 
}
 
public class MyForm
{
  public MyForm()
  {
    MyButton myButton = new MyButton();
    myButton.Click += new EventHandler(myButton_Click);
    myButton.Permission = "Can_click_this_button";
  }
 
  private void myButton_Click(object sender, EventArgs e)
  {
    //this is the stuff that I want to happen only if the person has the required permission, else do nothing, but i do not want to do an explicit check here, since it is already being done in the MyButton class
  }
 
}

Someone please help? Thank you

[imajin]

Please help me! Or tell me if you you have some other approach I can look at :(

[Plater]

You want this button to only work if a certain condition is met? And you want to be able to use the button anywhere?

In your inhereited button class, if you add STATIC member variables, they will be the SAME for every instance of your button.
So if you add your permission stuff as statics to your custom class, when your special button is clicked (regardless of which form it is on) it can check against those "permissions" to see if it should perform an action or not.

[imajin]

If you look at line 29 in my code, I need something to put there to stop the event from firing in the child button, which is on line 47, but I do not want to put an explicit check there, as that is already done in the parent class. Another reason is that making the check explicit would entail a LOT of changes having to be made because the button is already used on a lot of forms, so I really want to minimize the code changes. Someone please help me :(

[Plater]

Is the action the button performs different for each use? Actually nevermind, I think I have a possible solution.

In your derrived button class, you need to do some sneainess.
I *think* you can do this:
Inside the derrived class, add a listener to the button click.
Inside the derrived class, create a custom event with the same name as the click event. (You would need to use the override, if you cannot, I guess you need to name it like SecureClick or something)
Then, in th event handler you made for the click event inside your derrived class, you would perform the security check stuff you wanted, and if it passes, trigger your custom event to fire.

My hope is that you can override the Click event in the derrived class to perform the permissions check, then either fire the event or cancel it, so the form never even gets the button click event.
If you can't override it, make that SecureClick event and have the forms listen for that instead of the Click event.