Creating an action for a not in beforehand existing button

Question

Isn't it possible to create the name associated to the _Click action while the button hasn't been created in beforehand? It's a little hard to explain but I think it gets clearer while skimming through my code:

index = Array.FindIndex(bookmarks, i => i == null || i.Length == 0); //find closest empty spot in array
bookmarks[index] = "http://" + Urlbox.Text;
book[index] = new Button();
book[index].Height = 31;
book[index].Content = bookmarks[index];
book[index].Click += book[index]_Click;
Bookbar.Items.Add(book[index]);

My method as follows:

public void book[index]_Click(object sender, RoutedEventArgs e)
{

    WebBrowser1.Navigate("random url");
}

As you can see, my button is programmatically created before I try to add an action to it. However, I'm getting the wierd error Error 1 ; expected under the line creating my action. Although, changing that line to book[index].Click += Bookmark_Click; where Bookmark is in beforehand an existing button seems to work just fine.

The reason im using arrays is that I want to create multiple buttons and give each one of them a different _Click action. What am I doing wrong?

Answer 1

You can't write

book[index].Click += book[index]_Click;

The syntax is just wrong.

You need to prepare one handler to all the buttons and use the sender parameter to differentiate between them. Example:

void buttonBook_Click(object sender, EventArgs e)
{
    // implementation...
}

You have to register this handler as follows:

book[index].Click += buttonBook_Click;

Answer 2

First, you cannot use [] in the name of a method, which is your error.

However by the looks of what you are doing, each button is simply navigating to a different url. This isn't a different operation, simply a parameterised one.

There are several ways to get round this, this simplest is a method which pulls the url back out of the button

public void book_Click(object sender, RoutedEventArgs e)
{
  // since we copied this already
  WebBrowser1.Navigate(new Uri(((Button)sender).Content));
}

Alternatively you can also use an anonymous method, this relies on a closure (index being captured at the time the anonymous method is created).

book[index].Click += (sender, e) { WebBrowser1.Navigate(bookmarks[index]); };

Answer 3

Problem is that book[index]_Click is incorrect method name so you can't use it as an event handler. You can use anonymous functions instead:

book[index].Click += (s, r) { WebBrowser1.Navigate("random url"); };