keyword var is not working in .netframwork 2.0 - visual studio 2005

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.NET2.0

Hello all,

I developed a website in .net framework 3.5 and than I was asked by my boss to integrate that to 2.0. Now almost I have fixed all the errors that were generating because of version changes but I am not able to over come an error which is not allowing me to use var keyword. Actually I am making use of EPPlus package for exporting data to excel sheets in my website. The code needs to use the var keyword at many places and I get an error which says are u missing an Assembly reference ?

Even i tried with

C#

type x = new type();

but still no go. Is there any alternative for using var ? Please help me out.
Here is my code:

C#

var cell = ws.Cells[rowIndex, colIndex];



                   //Setting the background color of header cells to Gray

                   var fill = cell.Style.Fill;
                   var vallign = cell.Style.VerticalAlignment;
                   var hallign = cell.Style.HorizontalAlignment;

Thank you !

Posted 10-Oct-12 20:37pm

Taresh Uppal

Updated 10-Oct-12 20:39pm

v2

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Peeyush Pachaori · Answer 1 · 2012-10-10T20:40:00

Solution 1

Var keyword is avaliable for.net framework 3.0 and above hence it will not work in .net f/w 2.0. For more information please refer:-

http://msdn.microsoft.com/en-us/library/bb383973.aspx[^]

Posted 10-Oct-12 20:40pm

Peeyush Pachaori

Updated 10-Oct-12 20:42pm

v2

Comments

Oshtri Deka 11-Oct-12 2:44am

That's right.
There were significant changes from v2.0 to 3.0(3.5).
My 5.

Peeyush Pachaori 11-Oct-12 5:32am

Thanks Oshtri.

Taresh Uppal 11-Oct-12 2:45am

ok i see... So is there any alternative to this referring to my code. Because the variables like cell,fill, vallign are custom type and they make me modify my excel sheet. Can i use any other substitute for the var keyword ??

Sushil Mate 11-Oct-12 2:59am

There is no alternative for var in .net 2.0, You better upgrade your framework or explicitly convert to your custom type.

Taresh Uppal 11-Oct-12 3:11am

how can I convert cell as a data type so that I can make it use further. I am confused a lot !

Peeyush Pachaori 11-Oct-12 5:58am

You can typecast it. I suggest you to create a class with necessary fields and type cast your cell.style to it.

Akinmade Bond · Answer 2 · 2012-10-11T01:44:00

As opposed to using the var keyword, you can use the Object keyword.

The object type is an alias for Object in the .NET Framework. In the unified type system of C#, all types, predefined and user-defined, reference types and value types, inherit directly or indirectly from Object. You can assign values of any type to variables of type object. When a variable of a value type is converted to object, it is said to be boxed. When a variable of type object is converted to a value type, it is said to be unboxed.

Beginning in Visual C# 3.0, variables that are declared at method scope can have an implicit type var. An implicitly typed local variable is strongly typed just as if you had declared the type yourself, but the compiler determines the type.

Using .Net framework 3.0 and higher you'll use

C#

var myVar = new UnknownType();

Using .Net framework lower than 3.0, you'll use

C#

object myVar = new UnknownType();

MT_ · Answer 3 · 2012-10-10T21:07:00

Solution 2

I haven't used myself but on following link, it is explained you can use var.

http://weblogs.asp.net/shahar/archive/2008/01/23/use-c-3-features-from-c-2-and-net-2-0-code.aspx[^]

By the way, can you not use object ?
-Milind

Posted 10-Oct-12 21:07pm

MT_

Comments

Taresh Uppal 11-Oct-12 3:11am

exactly !
I saw this link earlier also and I was amazed to see how this guy is working with the same ? Moreover I am not able to relate this blog to my code..:(

AnkitGoel.com · Answer 4 · 2012-10-11T01:12:00

Solution 3

try using object in-place of var. use use the data type of the value that is being returned from the property.

Posted 11-Oct-12 1:12am

AnkitGoel.com