Maybe I'm just a little slow...

BioSensorAB » Maybe I’m just a little slow…

BioSensorAB » Maybe I’m just a little slow… — Fri, 29 Feb 2008 07:43:14 GMT

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re: Maybe I'm just a little slow...

MatthieuMEZIL — Fri, 29 Feb 2008 12:51:00 GMT

Hello Alex,

I love it! :-)

If I remember well, I have readen an article in which they say that in C#4, we will have an operator ?. which do what you do with extension methods.

if != null

Matthieu MEZIL — Fri, 29 Feb 2008 13:15:11 GMT

Qui n'a jamais fait quelque chose comme ça: LicensePlate licensePlate = null ; // Récupérer une instance

re: Maybe I'm just a little slow...

XIU — Fri, 29 Feb 2008 13:42:48 GMT

I made the same method just a few days ago (just called it IfNotNull but Maybe actually sounds better :P). Only difference is that I didn't use the constraint on V.

public static V Maybe<T, V>(this T t, Func<T, V> selector)

where T : class

{

return t != null ? selector(t) : default(V);

}

Vendredi c'est Expression Tree :)

Michel Perfetti [Miiitch] — Fri, 29 Feb 2008 18:18:31 GMT

Que les puristes de la performance soient rassurés, le reste du post n'est que pour le fun :) En discutant

re: Maybe I'm just a little slow...

AlexJ — Mon, 03 Mar 2008 21:33:53 GMT

@XUI: obviously great (excuse the self congratulation) minds think alike.

@Michel: that is pretty cool.

Maybe there is more

Meta-Me — Mon, 03 Mar 2008 21:47:19 GMT

Michel Prefetti , has taken my little Maybe thingie and taken it a lot further , by using expression

Maybe there is more

Noticias externas — Mon, 03 Mar 2008 22:13:05 GMT

Michel Prefetti , has taken my little Maybe thingie and gone a lot further , by using expression tree

re: Maybe I'm just a little slow...

macsgold — Fri, 07 Mar 2008 08:22:48 GMT

Eeek, changing the 'intuitive C# behavior' of code will get you into trouble sooner rather than later. If 'acquired intuition' says that x.M() throws a Null ref if x==null then change this behavior at your own risk. If I see a line x.M() I'd feel safe using "x.ToString()" on the next line but your way would make a fool out of me. It should be a golden rule of extension methods: throw null ref if the object is null. One day we may get 'not null object types' but extension are not the answer.