c# : how to identify from which childform was a button (belonging to a parentForm) clicked on?

I have 4 ChildForm(1..4)开发者_如何学Go whose base class is the ParentForm.

ParentForm has a button .

Is there a way to know from which ChildForm was the button actually clicked?

Controls have a Parent or Page property, can you use one of those?

Yes, with a bit of reflection you can do it. In the eventhandler user the sender object to get the type of the parent:

Type ChildFormType = ((Button)sender).Parent.GetType();

However, having to use reflection (query the type system) is often a sign of bad design. Some kind of Visitor Pattern implementation where the ParentForm as an abstract accept method might be a solution.

I understand that you have got 4 different classes for your 4 forms, all derived from the ParentForm. If this is the case, I would implement the ButtonClicked method in this way:

    private void button1_Click(object sender, EventArgs e)
    {
        // part common to all the forms (possibly void)
        specific_button1_Click(sender, e);
        // part common to all the forms (possibly void)
    }

    protected void specific_button1_Click(object sender, EventArgs e)
    {
    }

and then override the specific_button1_Click method in the derived forms