Comments on: C# 3.0 Tutorials: Implicitly typed local variables

By: santosh kumar

santosh kumar — Wed, 31 Mar 2010 06:08:18 +0000

This id gr8 !

Thank you

By: Var and try catch

Var and try catch — Tue, 02 Feb 2010 14:20:19 +0000

.. still wrong I can see. The serverside code does not treat the xml I insert as regular text. So I replace the greater than/lower than with a -

-basicModule-
-userNumber-0045613239-/userNumber-

-/basicModule-

By: Var and try catch

Var and try catch — Tue, 02 Feb 2010 14:17:29 +0000

Dont know what has happend with the xml file, so I try to past it again:

“+4545678998″

By: Var and try catch

Var and try catch — Mon, 01 Feb 2010 13:09:11 +0000

Hi again,

Im am trying to use linq to select data from an xml document.
The document looks like:

12345678

The userNumber is declared in the line:
res = from userNumber in xdoc.Descendants(“basicModule”) select userNumber.Element(“userNumber”).Value;

Actually I am not quite sure what type is returned from the xml document, but it does not help setting the var to a string

By: Michael Sync

Michael Sync — Mon, 01 Feb 2010 09:25:07 +0000

Hi Pigbear,

What will be the type of this “from userNumber in xdoc.Descendants(“basicModule”) select userNumber.Element(“userNumber”).Value”?

If it’s string then you need to initialize that variable.

var res = strine.Empty;

Hope it helps

By: Var and try catch

Var and try catch — Mon, 01 Feb 2010 09:18:07 +0000

How do I initialize my “var” variable if I am going to use it outside the try statement like this:

XDocument xdoc = XDocument.Load(@”C:\VisualStudio\myxmlfile.xml”);
var res = ; //GIVES ERROR HERE
try
{
res = from userNumber in xdoc.Descendants(“basicModule”) select userNumber.Element(“userNumber”).Value;
}
catch (Exception)
{

}

If I declare it inside the try-catch the initialization would be okay, but the it would not been known outside the try statement

Best Regards
Pigbear

By: Liam

Liam — Thu, 08 Oct 2009 09:54:45 +0000

“You shouldn’t use implicitly-typed local variable if you know the type.”

When would you not know the type?

By: Nik Radford

Nik Radford — Tue, 17 Jun 2008 12:24:16 +0000

Here’s a question, unfortunately I don’t have VS2008 at hand to test it with.

Now this is not great code but I just thought about

Lets say, for the sake of hypothesising

I have an interface called IMyInterface, I have an object called MyObject that implement IMyInterface.

I have a function that has a return type IMyInterface, but actually returns an instantiated MyObject.

I initialize my var with the return of this function.

for brevity and in pseudo I do this.

var myVar = MyFunction();

does myVar become of type IMyInterface or of type MyObject when I’m dealing with it?

I’m pretty sure visual studio will treat it as IMyInterface, because it’ll look up the return type of the function called in order to provide intellisense. But as to the compiler? hmm… I’ll have to test that. My Expectation would be IMyInterface, and if it wasn’t it’d be bad not to treats as IMyInterface, but it certainly provides food for thought.

By: Michael Sync

Michael Sync — Thu, 22 May 2008 08:08:06 +0000

Can you show me your LINQ code? Normally, you can check the count of var..
e.g.

Option #1.
selectedProduct.resultView.Count

Option #2.

bool isFound = false;

var selPdt = LINQ;

foreach(var i in selPdt){
isFound = true;
}

if(isFound){
//DoSomething
}

By: ahtesham

ahtesham — Thu, 22 May 2008 05:14:58 +0000

lets say i have store the values from linq store procedure into var
var selectedProduct= storeProcedure of linq
now i want to see if selectedProduct is null or empty
i tried with
selectedProduct==null
selectedProduct.returnValue=null
selectedProduct.returnValue.tostring()==string.empty
but none worked
so any suggestion that tell me that that var is empty or null or do not have any value
thanks in advance