Roslyn Code Fixes with type alias "string" - Visual Studio 2015 [duplicate]

Question

I have Visual Studio 2015 with the latest version of Reshaper (9.1.2).

I tend to use a style of referring to Types and type aliases much the way this answer describes. I like the general look of making variable declarations with the type alias and using the System type for expressing static functions that exist for the type.

As an example:

string greet = String.Format("Hello {0}!", place);

With that said, I'm seeing a Roslyn Code Fix in my IDE to replace String for string.

It asks to simplify...

And it comes out changing only the String to string:

I want to what this change affects, and why.

• Is it a performance improvement in compilation only?
• Does it add some minor speed benefits at runtime?
• Is there any other reason why I should care about this code improvement?

Answer 1

So, even now in the latest version of Visual Studio (2015) and the .NET (4.6) framework, string is still just an alias for String. It's simply a style suggestion from Visual Studio.

For anyone else who may want to remove this code style...

This setting can be turned off under: Tools => Options... => Text Editor => C# => Code Style => Prefer intrinsic predefined type keyword in member access expresssions.