Question

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Use of var keyword in C#

Which one is better? using var in variable type declaration or using true type like int , … ?
Why?

Which one is better?

public class A
{
   var v1 = 0;
   var v2 = string.Empty;
}

or

public class B
{
   int v1 = 0;
   string v2 = string.Empty;
}

Answer 1

As gdoron says, there’s no right or wrong answer, but in the interests of opinion, I’ll give mine.

I generally always explicitly use the type, rather than var because I find it is easier to understand what type something is. E.g, for someone else reading your code, it’s clear what the type is.

In your example, it’s hardly noticeable and a casual reader can easily see what is a string and what is an int. However, consider:

var f = SomeFunction();

To the eyes, it’s not clear what the type of f is immediately.

That said, var can be useful when doing something like:

var userMap_ = new Dictionary<string, User>();

as that surely saves some typing and it’s clear what the type is.