Difference between “var” and “object” in C#

Question

Is the var type an equivalent to Variant in VB? When object can accept any datatype, what is the difference between those two?

Answer 1

For more details have a look at http://www.codeproject.com/Tips/460614/Difference-between-var-and-dynamic-in-Csharp

Answer 2

one difference is Boxing and Unboxing with Object.

Answer 3

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. The following two declarations of i are functionally equivalent:

var i = 10; //implicitly typed
int i = 10; //explicitly typed

var isn't object

You should definitely read this : C# 3.0 - Var Isn't Object

Answer 4

Nope - var just means you're letting the compiler infer the type from the expression used to assign a value to the variable.

It's just syntax sugar to let you do less typing - try making a method parameter of type "var" and see what happens :]

So if you have an expression like:

var x = new Widget();

x will be of type Widget, not object.

Answer 5

The other answers are right on, I'd just like to add that you can actually put your cursor on the 'var' keyword and hit F12 to jump to the inferred type declaration.

Answer 6

Adding to the post.

Parent p = new Parent(); 
Child c  = new Child();//Child class derives Parent class
Parent p1 = new Child();

With above you can only access parent (p1) properties eventhough it holds child object reference.

var p= new Parent();
var c= new Child();
var p1 = new Child();

when using 'var' instead of class, you have access to both the parent and child class properties. it behaves like creating object for child class.