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May 20, 2024
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Add "nullable" value for warnings as errors #40965

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Add "nullable" value for warnings as errors
BillWagner May 16, 2024
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BillWagner May 20, 2024
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10 changes: 5 additions & 5 deletions docs/csharp/language-reference/compiler-options/errors-warnings.md
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Expand Up @@ -87,25 +87,25 @@ All warning messages are instead reported as errors. The build process halts (no

## WarningsAsErrors and WarningsNotAsErrors

The **WarningsAsErrors** and **WarningsNotAsErrors** options override the **TreatWarningsAsErrors** option for a list of warnings. This option can be used with all *CS* warnings. The "CS" prefix is optional. You can use either the number, or "CS" followed by the error or warning number. For other elements that affect warnings, see the [Common MSBuild properties](/visualstudio/msbuild/common-msbuild-project-properties).
The **WarningsAsErrors** and **WarningsNotAsErrors** options override the **TreatWarningsAsErrors** option for a list of warnings. This option can be used with all *CS* warnings. The "CS" prefix is optional. You can use either the number, or "CS" followed by the error or warning number. For other elements that affect warnings, see the [Common MSBuild properties](/visualstudio/msbuild/common-msbuild-project-properties). In addition to the list of warning IDs, you can also specify the string `nullable`, which treats all warnings related to nullability as errors.

Enable warnings 0219 and 0168 as errors:
Enable warnings 0219, 0168, and all nullable warnings as errors:

```xml
<WarningsAsErrors>0219,CS0168</WarningsAsErrors>
<WarningsAsErrors>0219,CS0168,nullable</WarningsAsErrors>
```

Disable the same warnings as errors:

```xml
<WarningsNotAsErrors>0219,CS0168</WarningsNotAsErrors>
<WarningsNotAsErrors>0219,CS0168,nullable</WarningsNotAsErrors>
```

You use **WarningsAsErrors** to configure a set of warnings as errors. Use **WarningsNotAsErrors** to configure a set of warnings that should not be errors when you've set all warnings as errors.

## NoWarn

The **NoWarn** option lets you suppress the compiler from displaying one or more warnings, where `warningnumber1`, `warningnumber2` are warning numbers that you want the compiler to suppress. Separate multiple warning numbers with a comma.
The **NoWarn** option lets you suppress the compiler from displaying one or more warnings, where `warningnumber1`, `warningnumber2` are warning numbers that you want the compiler to suppress. Separate multiple warning numbers with a comma. You can specify `nullable` to disable all warnings related to nullability.

```xml
<NoWarn>warningnumber1,warningnumber2</NoWarn>
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