CODEWITHSUNDEEP
c#
VeecoTech
VeecoTech

Reputation: 2143

invoke events in Form from class

Hi is there a way to call the buttonclick event in a Form from a class which is unrelated to that form?

Upvotes: 0

Views: 278

Answers (3)

Marginean Vlad
Marginean Vlad

Reputation: 329

In the class declaration i have the method ButtonClick that will be called from the form on the ButtonClick event.

class Myclass
{
    public Myclass()
    {

    }

    public void ButtonClick(object sender, EventArgs e)
    {
        MessageBox.Show("Button Click");
    }
}

In the from you assign the event fro the button:

Myclass c= new Myclass();
        button1.Click += new EventHandler(c.ButtonClick);

Upvotes: 0

Ritch Melton
Ritch Melton

Reputation: 11618

The MVP pattern is designed for this separation. That's similar to what @Jon Skeet is stating in his response, but the executing code is separated from the class.

public class Presenter
{
     public void DoStuff() {};
}

public MyForm : Form
{
     private Presenter presenter;
     public MyForm()
     {
        presenter = new Presenter();
     }

     private void OnButtonClick(object sender, EventArgs e)
     {
         presenter.DoStuff();
     }
}

Now you can call the click handler, but leave the form out of the invocation path.

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1503439

If you can get hold of the button itself (e.g. by asking the Form for its Controls collection etc), you can call Button.PerformClick. I'd say this is usually a bad idea though. If the form wants to let you perform a particular action, it should expose that as a public or internal method - and then call that method from the click handler.

Upvotes: 1

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