Error when using the null-propagating / null-conditional operator

Question

I am running a .NET 4.5 project in VS 2013. Why is the following code in error?

var w = Request.Properties["MS_HttpContext"] as System.Web.HttpContextWrapper;
string IP = w?.Request.UserHostAddress; //fail to compile

I found this code on this MSDN blog.

Camilo Terevinto · Accepted Answer · 2019-04-03 14:06:48Z

17

That is a new feature available in C# 6 and newer versions. It is called the null-conditional operator.

In order to use C# 6 you should download Visual Studio 2015 or a newer version, since the extension for Visual Studio 2013 isn't supported any more (see here).

edited Apr 3, 2019 at 14:06

Camilo Terevinto

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answered Apr 8, 2015 at 14:48

Patrick Hofman

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2 Comments

Jon Skeet Over a year ago

Well, a note from Mads: roslyn.codeplex.com/discussions/552378#post1291188 Beyond that... emails :)

Patrick Hofman Over a year ago

@Old: need more help?

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