Chris Chris - 4 months ago 13
C# Question

Why does ReSharper want to use 'var' for everything?

I've just started using ReSharper with Visual Studio (after the many recommendations on SO). To try it out I opened up a recent ASP.NET MVC project. One of the first and most frequent things I've noticed it suggesting is to change most/all my explicit declarations to

var
instead. For example:

//From This:
MyObject foo = DB.MyObjects.SingleOrDefault(w => w.Id == 1);
//To This:
var foo = DB.MyObjects.SingleOrDefault(w => w.Id == 1);


and so on, even with simple types such as
int
,
bool
, etc.

Why is this being recommended? I don't come from a computer science or .NET background, having "fallen into" .NET development recently, so I'd really like to understand what's going on and whether it's of benefit or not.

Answer

One reason is improved readability. Which is better?

Dictionary<int, MyLongNamedObject> dictionary = new Dictionary<int, MyLongNamedObject>();

or

var dictionary = new Dictionary<int, MyLongNamedObject>();