Compiler throws exception for same code in different PC

Question

Line below in my VS and works fine I checked in and my colleague get these code piece..

vm.MuayeneId = (MuayeneId ?? SessionItems.AktifMuayene?.MuayeneId) ?? throw new Exception("Muayene Id bulunamadi");

Somehow in his Visual Studio compiler draw the red line under throw keyword and says "; expected". Next line of these code yellow line and says "Unreachable code.." This is how it looks;

My colleague has also .NET 4.6.2 installed in his PC.. so what may cause this?

"My colleague has also .NET 4.6.2 installed in his PC" - but which version of Visual Studio is he using? — Jon Skeet, Jul 20 '18 at 08:41
@DaisyShipton VS 2015 community.. I wonder if it cause this as well — TyForHelpDude, Jul 20 '18 at 08:42
Have a look at [this answer](https://stackoverflow.com/a/43048660/5453249) on how to add C#7 support to VS 2015. — croxy, Jul 20 '18 at 08:43
Yes, that's absolutely the problem. I suggest they update to VS2017. — Jon Skeet, Jul 20 '18 at 09:04

ViRuSTriNiTy · Accepted Answer · 2018-07-20T08:44:08.937

4

The syntax is called throw expressions and it was introduced by C# 7.0. I assume your colleques use C# 6.0 or below hence the code does not compile.

Maybe your colleques are able to upgrade Visual Studio to use C# 7.0, see https://stackoverflow.com/a/43048660/3936440

C# version history can be found here posted by John Skeet. According to his list C# 7.0 was released with .NET 4.7 and VS 2017 (March 2017).

edited Jul 20 '18 at 08:44

answered Jul 20 '18 at 08:36

ViRuSTriNiTy

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That helps a lot! Thanks! – TyForHelpDude Jul 20 '18 at 09:28

Compiler throws exception for same code in different PC

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