Resharper: vars

Question

Why does Resharper want you to change most variables to var type instead of the actual type in the code?

Answer 1

It's just an option. You can disable it:

ReSharper -> Options -> Code Inspection -> Inspection Severity -> Code Redundencies -> Use 'var' keyword where possible: change this to "Do not show"

There's also the context (lightbulb) option which will take you in each direction - this is under ReSharper -> Options -> Languages -> C# -> Context Actions -> "Replaces explicit type declaration with 'var'"

Answer 2

I saw a video from Hadi Hariri, where he was presenting Resharper 6.x. His reasoning was, if you are forcing a user to use "var", you are actually forcing him to name the variable in a more meaningful way, that way all the names are readable and make more sense.

Answer 3

By default, it will "green squiggle" declarations of this type :

Person p = new Person();
^^^^^^

Because of the repetition.

It will also suggest (small green underscore) var when it can be inferred :

Person p = repository.GetPerson(1);
¯¯¯

In this case it can be infered because of the return type of the GetPerson method.

As stated by Jon Skeet, you can disable these suggestions in resharper's options.