Adding an Event handler Dynamically

Hi

I have coded a form contents that add controls in it at run time dynamically, and now I want to add event handlers (such as on-click event) to some of those dynamically-added controls at run time, how do I do that?
alfardanAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Kiran SonawaneProject LeadCommented:
You can do this like

Button cmd = new Button();
cmd.Text = "Click Me";
//Attach click event handler
cmd.Click += new EventHandler(MyMethod);

protected void MyMethod(object sender, EventArgs e)
    {
       
    }
0
Kiran SonawaneProject LeadCommented:
Here is VB.net code


Dim cmd As New Button
cmd.ID = "btnDynamicButton"
cmd.Text = "Click Me"
AddHandler cmd.Click, AddressOf Dynamic_Method
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Cloud Class® Course: MCSA MCSE Windows Server 2012

This course teaches how to install and configure Windows Server 2012 R2.  It is the first step on your path to becoming a Microsoft Certified Solutions Expert (MCSE).

alfardanAuthor Commented:
Great

Now in my method itself, how would I know which control was clicked in order to action the clicked event accordingly.

For example, if I clicked on a control that has the name "Label1" then I will let the system execute a certain code, and if another control with the name "Picture7" then I will execute another code.

Note: the dynamically-created controls at run time differ in type between Picture Box and Label control, and at their creation time dynamically, they were given unique names
0
Jacques Bourgeois (James Burger)PresidentCommented:
The sender parameter in the event points to the Control that calls the event.

If the control variable is visible in the event, you can check the following way.

If sender Is Label1 then
   'Code for Label1
End if

Otherwise, you will have to find another way to identify the Control

If DirectCast(sender,Control).Text = "Text on the control"
If DirectCast(sender, Control).Name = "NameOfTheControl"

If you want to go by the name, be sure to spedify It. The Name property of controls you add dynamically is not filled in automatically.
0
BuggyCoderCommented:
The control that was clicked will have its event handler called...

I mean if button1 is clicked then button1_clicked would get called which will have sender parameter on which if you do gettype you will get an instance of Button class....

Since you know the event handlers you have attached to these controls, you need not to check for the control in the event handler as you can statically  and safely use the control name there....

private void Button1_click(object sender, EventArgs args)
{
Button b = (Button)sender;
}

private void CheckBox1_click(object sender, EventArgs args)
{
CheckBox b = (CheckBox)sender;
}

Open in new window

0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Visual Basic.NET

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.