C# Is it possible to edit delegate parameters for WPF button_click events?

Question

This is probably a REALLY dumb question, but on the upside I don't think anyone's asked it here before(?)

The default number of parameters in all the button_clicked subscriber methods is two:

(object sender, RoutedEventArgs e)

I recently read that the arguments for the event are defined within the delegate. Now is this just one delegate for each button_clicked event? Or does each button have it's own separate delegate? I'm not explaining myself very well here...

Say I want to pass in three arguments into a single subscriber method instead of the above TWO, I've just had some simple code auto-generated for me after double clicking my button in designer view. Where is the class that that method subscribes to? Is there a way I can edit it's delegate and add in another parameter?

The reason I'm asking this WAS that I thought there could be a way to pass a variable to another class - into it's subscriber method. Unfortunately that subscriber method only takes two arguments. So I'm now looking for ways to easily pass in my variable, and this was a 'back-of-the-mind' sort of solution.

Answer 1

You guys are waaaayy overthinking this :). Simply use a lamda and you can redefine any delegate however you want:

theButton.Click += (x, y) => myHandler(someRandomParam1, someRandomParam2, someRandomParam3, someRandomParam4, ... someRandomParam73);

It's that simple.

Answer 2

You can set the Tag parameter of the button and then retrieve it in the handler.

If the button is defined in XAML:

If the button is defined in code:

var button  = new Button() {Tag = "Hi"};

Then in the event handler:

public void Click(object sender, RoutedEventArgs e)
{
   // this will give you the string "Hi"
   string hi = (string)((Button)sender).Tag;
}