Tag Archives: event

Speaking at SoftShake in Geneva October 24th

Post updated September 9th: you can win free Nokia devices during this session !

A short blog post to share some news about me… I will be speaking at Soft-Shake in Geneva later this October.

Logo-SoftShake

The session will be an introduction about Windows Phone 8 development and I will cover the following topics:

  • Brief history of Windows Phone 8 and ModernUI
  • Tooling (Visual Studio, Blend)
  • Development story (C#/XAML, C++/DirectX)
  • Tips and tricks (feedback from building my own app 2Day)

Soft-Shake is a 2 days event in Geneva with various tracks which make it very appealing for all of you (like me) who like to have a wide coverage of current technical (or not) subjects:

  • Agile
  • Functional Programming
  • Java
  • Microsoft
  • Web
  • Startup
  • Games
  • BigData

Thanks to Nokia I will have a few giveaways for the attendees. On top of fun and nice Nokia goodies for everyone 2 lucky people will go home with a brand new Windows Phone device to get started with development:

WP_20130920_005

I hope to meet some of you there :-)

Using extension methods to raise an event

While reviewing some code at work the last days, I noticed I had a lot of similar methods I used to raise events. Basically, I did a test to check if the EventHandler is not null, and in this case, I raise the event:

?View Code CSHARP
1
2
3
4
5
6
7
8
9
// declaration of the event
public event EventHandler Saved;
 
// method I use to raise the event
private void OnSaved()
{
  if (this.Saved != null)
    this.Saved(this, EventArgs.Empty);
}

In some of my classes, I had around 10 methods like this one to do the check, and raise the event if the associated event handler is not null. I was thinking about creating an extension method that would do this job for me… And actually, it’s very simple ! Here is the code:

?View Code CSHARP
1
2
3
4
5
6
7
8
9
10
11
12
13
 /// <summary>
/// Raise an event with a given EventArgs
/// </summary>
/// <param name="handler">EventHandler to raised</param>
/// <param name="sender">Sender of the event</param>
/// <param name="e">Argument of the event</param>
public static void Raise(this EventHandler handler, object sender, EventArgs e)
{
    if (handler != null)
    {
        handler(sender, e);
    }
}

Now, I can remove all methods that looks like the first I mentioned in the post, and simply write

?View Code CSHARP
1
Saved.Raise(this, EventArgs.Empty);

I also created an overload of the extension method that does not supply an EventArgs (in case you want to use EventArgs.Empty) and also a generic version (in case you want to use an EventHandler).
You can download the associated class here.