How Do I Add Event Handlers to .NET Buttons Programmatically?

Question

I'm trying to employ the strongest OOP I can muster in developing a web application, but I'm having issues adding event handlers to my objects as I create them using code. I'm sure it's a fairly simple solution that I just keep passing up, but I'm at a loss as to what to try next. Below is some test code I've been playing with, just trying to get a button press to go do something.

(Imagine there's a break point on the line "int i;")

    Button b = new Button();
    b.Text = "Do Something";
    b.Attributes.Add("runat", "server");
    b.Attributes.Add("OnClick", "click");
    form1.Controls.Add(b);

    private void click(object sender, EventArgs e)
    {
        int i;
    }

Since this is a new button created by my Page_Load, I can't just hardcode the XHTML. Debugging never hits my breakpoint. I haven't had any more success with CheckBoxes either.

Usually you use delegate functions in C#. What framework specifically are you targeting? — Richard J. Ross III
– Richard J. Ross III, Commented Feb 14, 2013 at 1:19

Mateus Schneiders · Accepted Answer · 2013-02-14 20:53:41Z

11

You have to subscribe to the Click event:

Button b = new Button();
b.Text = "Do Something";
b.Click += click;
form1.Controls.Add(b);

private void click(object sender, EventArgs e)
{
    int i;
}

By adding the onclick Attribute to the Button's Attributes collection, it will be rendered as an attribute on the HTML input tag. In that case you could use it to execute some javascript code on the client side.

b.Attributes.Add("onclick", "alert('Hey')");

//Will render the button as
<input type="submit" name="x" value="Do Something" onclick="alert('Hey')">

edited Feb 14, 2013 at 20:53

answered Feb 14, 2013 at 1:22

Mateus Schneiders

4,9133 gold badges23 silver badges41 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Steve Rousseau · Accepted Answer · 2015-10-04 15:13:47Z

1

You can do:

Button b = new Button();
b.Text = "Do Something";
b.Click += new EventHandler((s, ev) =>
                        {
                            int i;
                        });
form1.Controls.Add(b);

answered Oct 4, 2015 at 15:13

Steve Rousseau

9310 bronze badges

Collectives™ on Stack Overflow

How Do I Add Event Handlers to .NET Buttons Programmatically?

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related