Disable/suppress warning CS0649 in C# for a specific field of class

Question

I have some fields in a C# class which I initialize using reflection. The compiler shows CS0649 warning for them:

Field foo' is never assigned to, and will always have its default valuenull' (CS0649) (Assembly-CSharp)

I'd like to disable the warning for these specific fields only and still let the warning be shown for other classes and other fields of this class. It is possible to disable CS0649 for the whole project, is there anything more fine-grained?

score 104 · Accepted Answer · edited May 23 '17 at 12:02

104

You could use #pragma warning to disable and then re-enable particular warnings:

public class MyClass
{
    #pragma warning disable 0649

    // field declarations for which to disable warning
    private object foo;

    #pragma warning restore 0649

    // rest of class
}

Refer to Suppressing “is never used” and “is never assigned to” warnings in C# for an expanded answer.

edited May 23 '17 at 12:02

Community

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answered Dec 05 '12 at 15:36

Douglas

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Isn't the leading zero required? – SeToY Dec 05 '12 at 15:38
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@SeToY: Actually, no, they're not required. – Douglas Dec 05 '12 at 15:42
Thanks for clarifying that. That's why I've added the question mark next to my sentence :P – SeToY Dec 05 '12 at 15:44
I updated my answer to play it safe while I checked. No harm either way :-) – Douglas Dec 05 '12 at 15:45

BMac · Answer 2 · 2020-02-21T17:18:15.023

18

I believe it's worth noting the warning can also be suppressed by using inline initialization. This clutters your code much less.

public class MyClass
{
    // field declarations for which to disable warning
    private object foo = null;

    // rest of class
}

edited Feb 21 '20 at 17:18

answered Oct 28 '16 at 18:23

BMac

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also another way to do the same is with `default`; `private object foo = default;` – mayo May 18 '20 at 14:39

Alexander Bortnik · Answer 3 · 2012-12-05T16:29:53.073

10

//disable warning here
#pragma warning disable 0649

 //foo field declaration

//restore warning to previous state after
#pragma warning restore 0649

edited Dec 05 '12 at 16:29

answered Dec 05 '12 at 15:36

Alexander Bortnik

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score 6 · Answer 4 · answered Dec 05 '12 at 15:39

6

public class YouClass
{
#pragma warning disable 649
    string foo;
#pragma warning restore 649
}

answered Dec 05 '12 at 15:39

Hamlet Hakobyan

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What does your answer add to the questions solution that hasn't been posted 5 minutes ago? – SeToY Dec 05 '12 at 15:42
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He probably just didn't see the first answer. Thanks anyway:) – iseeall Dec 05 '12 at 15:43

Aggressor · Answer 5 · 2019-11-13T17:50:47.187

1

If you want to disable ALL warnings in the project (rather than per script) then do this:

Ceate a text file called mcs.rsp (for editor scripts) in your YOUR_PROJECT_NAME/Assets directory with contents (for example):

-nowarn:0649

(You can change the number to match whatever warning you want)

Original answer

Note: This doesn't disable the warnings in the Unity console if you are using Unity (I am still investigating how to remove those)

Here is some Unity documentation with more information

edited Nov 13 '19 at 17:50

answered Nov 13 '19 at 17:45

Aggressor

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If you name the file csc.rsp it works for the unity console. – jlreymendez Feb 29 '20 at 12:32
I just noticed this I will try it! – Aggressor Jun 23 '20 at 11:36

Disable/suppress warning CS0649 in C# for a specific field of class

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