What is main use of Var key word and what is that purpose?

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I have faced one question from CTS ie

suppose

int i=10;
int j=20;

then var s= i.z;

what happens if we can do like this and what is the output of that?

their main concern is what is the var key word does?

Posted 28-Sep-13 8:57am

DGKumar

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Anoop Kr Sharma 28-Sep-13 15:01pm

check this MSDN link

[no name] 28-Sep-13 16:09pm

It won't do anything. Your integer (i) does not have a property named "z" so your code will not even compile.

Sergey Alexandrovich Kryukov 29-Sep-13 1:49am

What's wrong with just reading language documentation?
—SA

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ZurdoDev · Answer 1 · 2013-09-28T09:58:00

Solution 1

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

Posted 28-Sep-13 9:58am

ZurdoDev

Comments

Sergey Alexandrovich Kryukov 29-Sep-13 1:51am

Exactly, a 5. Why asking such question of documentation is clear enough?
—SA

PIEBALDconsult · Answer 2 · 2013-09-28T10:13:00

Solution 2

It's for when a type isn't known until ~~run~~ compile time -- as with Linq's anonymous types.

Posted 28-Sep-13 10:13am

PIEBALDconsult

Updated 28-Sep-13 13:09pm

v2

Comments

Andreas Gieriet 28-Sep-13 16:20pm

No, that's wrong. var is known at compile time. You maybe confuse this with dynamic.
var tells the compiler to deduce the actual type at compile time. It allows to have anonymous types passed around. Anonymous types are know at runtime but have no name to access them. They are produced by new { X, Y }; where X and Y are known entities.
Cheers
Andi

PIEBALDconsult 28-Sep-13 19:11pm

Thank you. I don't use Linq, so I'm less familiar with the syntax.

Sergey Alexandrovich Kryukov 29-Sep-13 1:50am

Of course you are right, Andreas. Incorrect answer.
—SA