Unity Issue Tracker - [docfix] .NET4.6 - C#6 - Null propagation operator does not work if variable is null

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[docfix] .NET4.6 - C#6 - Null propagation operator does not work if variable is null

-

Jul 11, 2017

Reproduction steps:
1. Open the attached project
2. Open the scene
3. Press play

Expected: string "GO name: NAME IS NULL" is printed to debug console
Actual: UnassignedReferenceException is thrown

It works if the variable before Null propagation operator is not null though.

Reproduced on: 2017.1.0a6, 2017.1.0b2, 2017.1.0f3, 2017.2.0b2

Resolution Note (2018.3.X):

Updated the Docs about our take on null propergation and null conditional operators, for UnityEngine.Object and friends

Rennan24

Oct 12, 2017 16:16

Yeah I kinda wish they would remove the fake null for UnityEngine.Objects, but then again it would break a lot of projects that do if( gameObject ) instead of if( gameObject != null )... but I don't use if( gameObject ) so my projects wouldn't break! :D
BlackPete

Jul 18, 2017 22:45

I have a feeling that Unity will say that this is "as designed" due to the use of a fake null for UnityEngine.Object types.

However, this violates the principle of least surprise, and this breaks the null propagation operator, which should be a valid C# 6 operator.

At the very least, the exception should be removed.