Programming Forums > Application Development > C#

milot · May 20th, 2008, 9:51 AM

Hi guys,

Long time no post, I was busy studying and working in the same time so I didn't have time to join the forums. But now I found some time to share my experience on C# 3.0 with C# developers here.

Lately I started using new features which was introduced in C# 3.0 that are part of .NET Framework 3.5 and I was amazed by its features! I would like to know that if anybody here in the forums started using C# 3.0 yet?

I'm expecting questions and/or discussion about this topic

Druid · May 20th, 2008, 12:40 PM

What features of C# 3.0 and .NET 3.5 have you been using ? I personally, haven't used any.

Jimbo · May 20th, 2008, 10:50 PM

LINQ is pretty cool, but I haven't used it much. In terms of ASP.NET, 3.5 brought a bunch of stuff with it, especially related to AJAX.

milot · May 21st, 2008, 7:30 AM

Druid,

I started using anonymous types, extension methods, LINQ, new object initialization feature, lambda expressions instead of anonymous method delegate calls, the beautiful var keyword etc. If you want some code samples I will show you, or you can perform a simple google search and find tons of materials on the net.

Jimbo,

LINQ is awsome, I am using it against any object which implements IEnumerable<t> even if I have some legacy collections such as ArrayList I use LINQ against it using .OfType<T> operator to cast it to IEnumerable<T> object.

Narue · May 21st, 2008, 1:50 PM

>I would like to know that if anybody here in the forums started using C# 3.0 yet?
Yup.

>the beautiful var keyword
I get the sense that you're quite partial to this new feature. Would you mind explaining why? My impression is that implicitly typed variables are extremely easy to misuse and in many cases result in less transparent code. I suppose a more specific question would be what kind of guidelines are you using for when to implicitly type a variable and when to explicitly state the type?

xavier · May 21st, 2008, 11:12 PM

The var keyword is mandatory when you have an anonymous type and you go

 csharp Syntax (Toggle Plain Text) 
var person = new {Name="asdf",Age=1};
var person = new {Name="asdf",Age=1};

And I also use it for stuff like declaring :

csharp Syntax (Toggle Plain Text)

Dictionary<int,IList<NewObject>> dictionary = new .....

Using var in this case is really a blessing

In other cases I tend not to use it. But then again I haven't been doing too much 3.5

BstrucT · May 21st, 2008, 11:51 PM

I take it one can only use 3.5 with MS Visual C# 2008?

Jimbo · May 21st, 2008, 11:52 PM

I'm torn on the var syntax. On the one hand, it's weird in C# to declare a variable without explicitly declaring it's type. On the other hand, it's quite handy to use VB-ish syntax to give the variable a type without having to specify the type twice. Example:

(Toggle Plain Text)

// C# 2.0
Dictionary<String, String> foo = new Dictionary<String, String>();
// C# 3.0
var foo = new Dictionary<String, String>();
// VB
Dim foo As New Dictionary(Of String, String)

Then again, the typical LINQ usage of var is var foo = <some query returning who knows what type> so I can see why it can be controversial.

xavier · May 22nd, 2008, 1:28 AM

Quote:

Originally Posted by BstrucT

I take it one can only use 3.5 with MS Visual C# 2008?

Pretty much so.

BstrucT · May 22nd, 2008, 2:23 AM

Thanks.

May 20th, 2008, 9:51 AM	#1
milot Programmer Join Date: Nov 2006 Location: Kosov�/Prishtin� Posts: 47 Rep Power: 0	C# 3.0 Hi guys, Long time no post, I was busy studying and working in the same time so I didn't have time to join the forums. But now I found some time to share my experience on C# 3.0 with C# developers here. Lately I started using new features which was introduced in C# 3.0 that are part of .NET Framework 3.5 and I was amazed by its features! I would like to know that if anybody here in the forums started using C# 3.0 yet? I'm expecting questions and/or discussion about this topic

May 20th, 2008, 12:40 PM	#2
Druid Programmer Join Date: Mar 2006 Posts: 40 Rep Power: 0	Re: C# 3.0 What features of C# 3.0 and .NET 3.5 have you been using ? I personally, haven't used any.

May 20th, 2008, 10:50 PM	#3
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 754 Rep Power: 3	Re: C# 3.0 LINQ is pretty cool, but I haven't used it much. In terms of ASP.NET, 3.5 brought a bunch of stuff with it, especially related to AJAX. __________________ <insert disclaimer here> <insert shameless plug for Visual Studio here>

May 21st, 2008, 7:30 AM	#4
milot Programmer Join Date: Nov 2006 Location: Kosov�/Prishtin� Posts: 47 Rep Power: 0	Re: C# 3.0 Druid, I started using anonymous types, extension methods, LINQ, new object initialization feature, lambda expressions instead of anonymous method delegate calls, the beautiful var keyword etc. If you want some code samples I will show you, or you can perform a simple google search and find tons of materials on the net. Jimbo, LINQ is awsome, I am using it against any object which implements IEnumerable<t> even if I have some legacy collections such as ArrayList I use LINQ against it using .OfType<T> operator to cast it to IEnumerable<T> object.

May 21st, 2008, 1:50 PM	#5
Narue Professional Programmer Join Date: Sep 2005 Posts: 419 Rep Power: 3	Re: C# 3.0 >I would like to know that if anybody here in the forums started using C# 3.0 yet? Yup. >the beautiful var keyword I get the sense that you're quite partial to this new feature. Would you mind explaining why? My impression is that implicitly typed variables are extremely easy to misuse and in many cases result in less transparent code. I suppose a more specific question would be what kind of guidelines are you using for when to implicitly type a variable and when to explicitly state the type? __________________ Even if the voices aren't real, they have some pretty good ideas.

May 21st, 2008, 11:12 PM	#6
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 381 Rep Power: 4	Re: C# 3.0 The var keyword is mandatory when you have an anonymous type and you go csharp Syntax (Toggle Plain Text) var person = new {Name="asdf",Age=1}; var person = new {Name="asdf",Age=1}; And I also use it for stuff like declaring : csharp Syntax (Toggle Plain Text) Dictionary<int,IList<NewObject>> dictionary = new ..... Dictionary<int,IList<NewObject>> dictionary = new ..... Using var in this case is really a blessing In other cases I tend not to use it. But then again I haven't been doing too much 3.5 __________________ Don't take life too seriously, it's not permanent !

May 21st, 2008, 11:51 PM	#7
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 175 Rep Power: 1	Re: C# 3.0 I take it one can only use 3.5 with MS Visual C# 2008? __________________ The more the human race tries to change everything, when not needed, the less will they be able to change themselves when they need to.

May 21st, 2008, 11:52 PM	#8
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 754 Rep Power: 3	Re: C# 3.0 I'm torn on the var syntax. On the one hand, it's weird in C# to declare a variable without explicitly declaring it's type. On the other hand, it's quite handy to use VB-ish syntax to give the variable a type without having to specify the type twice. Example: (Toggle Plain Text) // C# 2.0 Dictionary<String, String> foo = new Dictionary<String, String>(); // C# 3.0 var foo = new Dictionary<String, String>(); // VB Dim foo As New Dictionary(Of String, String) // C# 2.0 Dictionary<String, String> foo = new Dictionary<String, String>(); // C# 3.0 var foo = new Dictionary<String, String>(); // VB Dim foo As New Dictionary(Of String, String) Then again, the typical LINQ usage of var is `var foo = <some query returning who knows what type>` so I can see why it can be controversial. __________________ <insert disclaimer here> <insert shameless plug for Visual Studio here>

May 22nd, 2008, 2:23 AM	#10
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 175 Rep Power: 1	Re: C# 3.0 Thanks. __________________ The more the human race tries to change everything, when not needed, the less will they be able to change themselves when they need to.

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