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C# eventhandler. big issue.

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NINTENDO
Grandmaster Cheater Supreme

Reputation: 0

Joined: 02 Nov 2007
Posts: 1371

Posted: Fri Sep 05, 2008 5:32 am Post subject: C# eventhandler. big issue.

Why can't you delcare a new eventhandler for each new object in a for statement. ?

Code:

Button[] mybutton = new Button[30];

for (int i=0; i<5; i++)
{
mybutton[i] = new Button();
mybutton[i].Click += new EventHandler(???);
}

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samuri25404
Grandmaster Cheater

Reputation: 7

Joined: 04 May 2007
Posts: 955
Location: Why do you care?

Posted: Tue Sep 09, 2008 9:25 am Post subject:

You can.

Code:

for (int i = 0; i < 5; i++)
{
//other stuff...
Buttons[i].Click += new EventHandler(ButtonClickMethod);
}

Or, using Lambda (.NET 3.5)...

Code:

for (int i = 0; i < 5; i++)
{
Buttons[i].Click += new EventHandler(
(sender, e) =>
{
//do stuff... like
MessageBox.Show("Button was clicked");
});
}

A neat little thing you can do:

Code:

for (int i = 0; i < 5; i++)
{
//do some stuff
Buttons[i].Tag = i;
Buttons[i].Click += new EventHandler(
(sender, e) =>
{
MessageBox.Show("Button " + ((int)((Button)sender).Tag).ToString() + " was clicked.");
});
}

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