"Simple / Fast" Event

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i just found a piece(not enought to find it out) of code and i'm wondering how i can do this, because it's much better than a normal event in my case

C#

console.BindCommand("!", delegate(GameTime gameTime, string[] args)
            {
                console.WriteLine(args[0]);
            });

a simple example of how it looks.
so this will be runned if my class detects that the user wrote "!"

thanks for the help :)

Posted 8-Aug-11 10:34am

94HellGate

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post-script:

Anooop Madhusudanan, author of the excellent 'AmazedSaint's Tech #Journal' blog[^], has published an excellent collection of his essays on-line, that does a great job of reviewing the history of 'events' in .NET:

http://www.scribd.com/doc/53728207/Revisting-C-V1-0

He demonstrates very clearly different ways of writing events as newer versions of .NET has introduced Lambdas, etc.

best, Bill

Posted 1-Sep-11 22:18pm

BillWoodruff

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Christian Graus · Accepted Answer · 2011-08-08T10:41:00

It's all you need. The delegate is an anonymous method. So, you use this syntax to create inline events. The real advantage is, any variables in the method that creates this, are visible to the delegate. Google anonymous methods if you need more help.

I should add, this runs no faster or slower than an externally defined delegate method.

BillWoodruff · Accepted Answer · 2011-08-08T11:17:00

Hi, Christian is absolutely right, and an event definition can be even simpler using Lambda form in .NET 4.0:

//'SomeControl' stands for any control that exposes a 'KeyDown' event
SomeControl.KeyDown += (sndr,eArgs)=>{MessageBox.Show(eArgs.KeyCode.ToString());};

In this example, you define the event while attaching it at the same time via Lambda.

Suggest you read Jon Skeet's "C# in Depth" (Manning Press) to get a great explanation of all the developments in the area of events, delegates in .NET C#.

"Simple / Fast" Event

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